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WO2020065321A1 - Compositions de formation de couleur - Google Patents

Compositions de formation de couleur Download PDF

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Publication number
WO2020065321A1
WO2020065321A1 PCT/GB2019/052716 GB2019052716W WO2020065321A1 WO 2020065321 A1 WO2020065321 A1 WO 2020065321A1 GB 2019052716 W GB2019052716 W GB 2019052716W WO 2020065321 A1 WO2020065321 A1 WO 2020065321A1
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WO
WIPO (PCT)
Prior art keywords
additional
alkyl
radiation
compound
substrate
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/GB2019/052716
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English (en)
Inventor
Thomas Pugh
David Stewart
Binto SIMON
Jason TWEEDIE
Richard Cook
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
DataLase Ltd
Original Assignee
DataLase Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from GBGB1904755.4A external-priority patent/GB201904755D0/en
Priority claimed from GBGB1906614.1A external-priority patent/GB201906614D0/en
Application filed by DataLase Ltd filed Critical DataLase Ltd
Publication of WO2020065321A1 publication Critical patent/WO2020065321A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
    • G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
    • G03F7/004—Photosensitive materials
    • G03F7/025—Non-macromolecular photopolymerisable compounds having carbon-to-carbon triple bonds, e.g. acetylenic compounds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
    • B41M5/28—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used using thermochromic compounds or layers containing liquid crystals, microcapsules, bleachable dyes or heat- decomposable compounds, e.g. gas- liberating
    • B41M5/282—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used using thermochromic compounds or layers containing liquid crystals, microcapsules, bleachable dyes or heat- decomposable compounds, e.g. gas- liberating using thermochromic compounds
    • B41M5/284—Organic thermochromic compounds
    • B41M5/285—Polyacetylenes
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D231/00—Heterocyclic compounds containing 1,2-diazole or hydrogenated 1,2-diazole rings
    • C07D231/02—Heterocyclic compounds containing 1,2-diazole or hydrogenated 1,2-diazole rings not condensed with other rings
    • C07D231/10—Heterocyclic compounds containing 1,2-diazole or hydrogenated 1,2-diazole rings not condensed with other rings having two or three double bonds between ring members or between ring members and non-ring members
    • C07D231/12—Heterocyclic compounds containing 1,2-diazole or hydrogenated 1,2-diazole rings not condensed with other rings having two or three double bonds between ring members or between ring members and non-ring members with only hydrogen atoms, hydrocarbon or substituted hydrocarbon radicals, directly attached to ring carbon atoms
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
    • G03C1/00—Photosensitive materials
    • G03C1/72—Photosensitive compositions not covered by the groups G03C1/005 - G03C1/705
    • G03C1/73—Photosensitive compositions not covered by the groups G03C1/005 - G03C1/705 containing organic compounds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M2205/00—Printing methods or features related to printing methods; Location or type of the layers
    • B41M2205/04—Direct thermal recording [DTR]

Definitions

  • the present invention relates to compositions, in particular compositions for forming an image on or within a substrate.
  • In-line digital printing is a process known for the formation of greyscale, single- coloured (monochromic), or multi-coloured images on or within substrates.
  • Radiation from a laser source(s) effects laser-reactive components in compositions applied on or incorporated within substrates such that they change colour upon application of the radiation.
  • composition comprising:
  • an activatable component capable of transitioning from a non-coloured state to a coloured state, the transition being effected by the application of an applied transition stimulus, wherein the activatable component requires activation to allow transitioning to occur, where said activation occurs by application of an activation temperature;
  • a substrate comprising a composition applied to or incorporated within, the composition comprising:
  • an activatable component capable of transitioning from a non-coloured state to a coloured state, the transition being effected by the application of an applied transition stimulus, wherein the activatable component requires activation to allow transitioning to occur, where said activation occurs by application of an activation temperature;
  • an activatable component capable of transitioning from a non-coloured state to a coloured state, the transition being effected by the application of an applied transition stimulus, wherein the activatable component requires activation to allow transitioning to occur, where said activation occurs by application of an activation temperature;
  • a composition applied to or incorporated within comprising:
  • an activatable component capable of transitioning from a non-coloured state to a coloured state, the transition being effected by the application of an applied transition stimulus, wherein the activatable component requires activation to allow transitioning to occur, where said activation occurs by application of an activation temperature;
  • a composition applied to or incorporated within comprising:
  • an activatable component capable of transitioning from a non-coloured state to a coloured state, the transition being effected by the application of an applied transition stimulus, wherein the activatable component requires activation to allow transitioning to occur, where said activation occurs by application of an activation temperature;
  • an activatable component capable of transitioning from a non-coloured state to a coloured state, the transition being effected by the application of an applied transition stimulus, wherein the activatable component requires activation to allow transitioning to occur, where said activation occurs by application of an activation temperature;
  • compositions in the formation of an image on or within a substrate comprising a composition applied to or incorporated within, the composition comprising:
  • an activatable component capable of transitioning from a non-coloured state to a coloured state, the transition being effected by the application of an applied transition stimulus, wherein the activatable component requires activation to allow transitioning to occur, where said activation occurs by application of an activation temperature;
  • a substrate having applied thereon a plurality of discrete layers wherein the plurality of discrete layers comprise: (a) an activatable component capable of transitioning from a non-coloured state to a coloured state, the transition being effected by the application of an applied transition stimulus, wherein the activatable component requires activation to allow transitioning to occur, where said activation occurs by application of an activation temperature; and (b) two additional components each capable of transitioning from a non- coloured state to a coloured state, the transition being effected by the application of an additional applied stimulus or an additional temperature; wherein, if formed, the coloured states of the activatable component and each of the two additional components are different in colour, and the activatable component and at least one of the two additional components are present in different layers of the plurality of discrete layers applied on the substrate.
  • a ninth aspect of the present invention there is provided a method of forming a substrate having applied thereon a plurality of discrete layers, where
  • an activatable component capable of transitioning from a non-coloured state to a coloured state, the transition being effected by the application of an applied transition stimulus, wherein the activatable component requires activation to allow transitioning to occur, where said activation occurs by application of an activation temperature;
  • a method of forming colour on a substrate having applied thereon a plurality of discrete layers wherein the plurality of discrete layers comprises: (a) an activatable component capable of transitioning from a non-coloured state to a coloured state, the transition being effected by the application of an applied transition stimulus, wherein the activatable component requires activation to allow transitioning to occur, where said activation occurs by application of an activation temperature; and (b) two additional components each capable of transitioning from a non- coloured state to a coloured state, the transition being effected by the application of an additional applied stimulus or an additional temperature; wherein, if formed, the coloured states of the activatable component and each of the two additional components are different in colour, and the activatable component and at least one of the two additional components are present in different layers of the plurality of discrete layers applied on the substrate; the method comprising applying to the substrate the applied transition stimulus and activation temperature and each of the additional applied stimuli or
  • a method of forming an image on a substrate having applied thereon a plurality of discrete layers, wherein the plurality of discrete layers comprises:
  • an activatable component capable of transitioning from a non-coloured state to a coloured state, the transition being effected by the application of an applied transition stimulus, wherein the activatable component requires activation to allow transitioning to occur, where said activation occurs by application of an activation temperature;
  • the intention of the present invention is to provide a laser-reactive composition that is capable of providing colour or an image on or within a substrate using a laser source(s) to manipulate colour changes in the components of the laser- reactive composition at localised positions so as to create a single- or multi- coloured image having any desired colour.
  • the present invention is of particular use in in-line printing, and allows compositions to be prepared with components that can respond to radiation or other stimuli to generate predictable colours for image formation.
  • a broad colour gamut can therefore be achieved using these laser-reactive components.
  • Non-coloured state refers to the natural state of a component before the applied transition stimulus, additional applied stimulus or additional temperature is applied to it.
  • the non-coloured state of a component may be white, off-white or colourless i.e. clear, or have reduced, or low visible, colour, i.e. is paler in colour (a lighter shade or less intense colour) than a coloured state of the same colour.
  • the natural state (non- coloured state) of a component may possess an initial colour which will change following application of the applied transition stimulus, additional applied stimulus or additional temperature to a more intense colour (coloured state) or a different colour (coloured state).
  • the component in the natural state, the component may often appear to display a colour, but that when compared with a coloured state of the same component, it will be paler in colour, i.e. less intensely coloured, or a different colour. It will be appreciated that, when the non-coloured state of a component is colourless, any underlying colour of the substrate on which the component is applied to or incorporated within will be visible.
  • Cold state and like terms as used herein, refers to the state of a component in which the component displays a colour, i.e. is substantially or highly coloured, in the visible spectrum and to a human eye. The "coloured state” will be more intensely coloured that the "non-coloured state” of the same component.
  • colour This may be a more intense colouration of the same colour, but also may be a more intense colouration of a different colour to that of the non- coloured state as discussed above.
  • coloured state the singular encompasses the plural and vice versa.
  • a coloured state the term encompasses one or more coloured states.
  • some components may have two coloured states, such as a first and a second coloured state, each of the first and second coloured states displaying a different colour.
  • colour and like terms as used herein, is meant the colours and hues of the visible light colour spectrum, i.e.
  • a coloured state formed by a component may have a primary or secondary colour.
  • the term may also be used to describe differing shades of each of the colours of the visible light colour spectrum, in addition to magenta, purple, pink, cyan, turquoise, brown and black, and combinations thereof.
  • “Stable coloured state” and like terms as used herein, refers to the coloured state of a component that is stable under ambient conditions, i.e. maintains essentially its colour under ambient conditions.
  • “Ambient conditions” and like terms as used herein, refers to the normal range of conditions of the surrounding environment to which the components are exposed, i.e. the range of temperatures, pressures and atmospheric conditions to which the components are exposed during use, storage and otherwise. This includes solar radiation including electromagnetic radiation of X-rays, ultraviolet (UV) and infrared (IR) radiation.
  • ambient conditions include a temperature of from 10 to 35 °C, a pressure of from 20 to 100 kPa, and the environment is typically an oxygen-containing atmosphere.
  • the required stability of the coloured state of a component will be dependent upon the application for which a substrate having the composition and therefore the component applied to or incorporated within is intended to be used.
  • the required stability of the coloured state of the component of the composition will only need to be for a relatively short period of time, for example, a number of hours such as 6 to 12 hours, or a number of days such as 3 or 4 days.
  • the required stability of the coloured state of the component will be greater, for example, a number of months, or even a number of years for outdoor signage uses.
  • stable under ambient conditions is meant that when exposed to ambient conditions for at least a number of hours or a number of days, such as for at least two weeks, the coloured state maintains essentially its colour.
  • the component will permanently remain in the particular coloured state. Accordingly, it is preferred that a component remains in the coloured state for at least 3 days, preferably for at least 4 days, more preferably for at least 1 or even at least 2 weeks, and most preferably, for at least 2 months.
  • the non-coloured state can form part of the monochromic image.
  • the non-coloured state of a component is non-colour, i.e. is white, off-white or colourless, the non-coloured state can form part of the monochromic image.
  • Multi-coloured image refers to an image that is human or machine readable having multiple colours, i.e. displaying 2 or more colours that are visible to the human eye.
  • the non-coloured state can form part of the multi-coloured image.
  • image incorporates, but is not limited to: text, pictures, logos, graphics, figures and symbols. The term also incorporates both single- and multi-coloured images. It will be appreciated that it is the manipulation of the components of the composition that facilitates the formation of an image.
  • Transitioning and “transition” and like terms as used herein refer to the components changing irreversibly from a non-coloured state to a coloured state upon application of the applied transition stimulus, additional applied stimulus or additional temperature, or from a first coloured state to a second coloured state as applicable upon application of the applied temperature. It will be appreciated by a skilled person that these are intentional transitions facilitated by the application of the applied transition stimulus, applied temperature, additional applied stimulus or additional applied temperature as required to the components . By the term “irreversibly” is meant that once the coloured state of the component has been formed, the coloured state of the component will be stable under ambient conditions.
  • Print in-line digital printing
  • laser printing and like terms as used herein, refer to the process of using radiation to achieve colour and form an image on a substrate
  • Randomness refers to energy in the form of waves or particles, and in particular, refers to electromagnetic radiation such as ultraviolet (UV), visible, near-infrared (NIR), and infrared (IR) particle radiation, e.g. alpha (a) radiation, beta (b) radiation, neutron radiation and plasma.
  • UV ultraviolet
  • NIR near-infrared
  • IR infrared
  • alpha a
  • beta b
  • neutron radiation and plasma e.g. alpha (a) radiation
  • a distinction is made between radiation of greater than 400 nm, e.g. near-infrared radiation, which causes vibrational, conductive and radiative excitation to the components upon application and therefore provides a‘temperature’, and radiation of 400 nm or less (e.g. ultraviolet radiation), or microwave radiation, which does not.
  • the "temperature” applied to the compositions and compounds is intended to include the temperature provided to the compositions and compounds through the application of thermal energy in different conductive, radiative and vibrational forms. As discussed, this may be through application of radiation of greater than 400 nm.
  • laser source(s) and like terms as used herein includes any suitable commercial or non-commercial laser source(s).
  • Activated and like terms as used herein in relation to the activatable component refer to the non-coloured state of the component when it is capable of undergoing a transition to a coloured state. It will be appreciated by a skilled person that the non-coloured state can either exist in (a) an unactivated form, i.e. incapable of undergoing a transition from the non-coloured state to a coloured state when the applied transition stimulus is applied to the composition and thus, the activatable component; or (b) an activated form, i.e. capable of undergoing a transition from the non-coloured state to a coloured state when the applied transition stimulus is applied to the composition and thus, the activatable component.
  • activation and like terms as used herein in relation to the activatable component, refer to the process by which the non-coloured state of the component is activated, i.e. changes from an unactivated to activated form. This is facilitated by the application of an activation temperature.
  • the activatable component may be selected from any suitable component.
  • the activatable component may be a diacetylene compound, i.e. a compound comprising a diacetylene moiety
  • the activatable component may be a diacetylene compound having the following formula (I): wherein x is from 2 to 12, preferably 2 to 10, and more preferably 2 to 8; O
  • L is selected from an amide having the formula: H , and an ester having the formula: , 3 ⁇ 4A ⁇ 0 ⁇ _ t preferably L is an amide having the formula y H j ,
  • Q is selected from a cyclopropyl and a -(CH 2 ) y -CH 3 linear alkyl chain, y being selected from 1 to 20, preferably 5 to 19, and more preferably 5 to 17; and T is selected from hydrogen, a -(CH 2 ) X (CH 3 ) linear alkyl chain wherein x is defined as above for formula (I), and -(CH 2 ) X -L-Q, wherein x, L and Q are as defined above for formula (I).
  • the diacetylene compound can be either symmetrical or unsymmetrical, i.e. T is -(CH 2 ) X -L-Q and the values of x, L and Q are the same as those on the other side of the diacetylene moiety (symmetrical), or T is hydrogen, a -(CH 2 ) X (CH 3 ) linear alkyl chain, or -(CH 2 ) X -L-Q and the values of x, L and Q are not the same on both sides of the diacetylene moiety (unsymmetrical).
  • T is -(CH 2 ) X -L-Q and the values of x, L and Q are the same on both side of the diacetylene moiety, such that the diacetylene compound is symmetrical.
  • the activatable component may be a diacetylene compound of formula (II):
  • x is from 4 to 8
  • Q is selected from cyclopropyl and a -(CH 2 ) y (CH 3 ) linear alkyl chain wherein y is 5 to 17.
  • suitable diacetylene compounds include, but are not limited to the following: N1 ,N22-dioctadecyldocosa-10,12-diynediamide, N1 ,N22- dihexadecyldocosa-10-12-diynediamide, N 1 , N22-ditetradecyldocosa-10,12- diynediamide, N1 ,N22-didodecyldocosa-10,12-diynediamide, N1 ,N22- didecyldocosa-10, 12-diynediamide, N 1 , N22-dioctyldocosa-10, 12-diynediamide, N1 , N22-dihexy
  • the diacetylene compound is a diacetylene compound selected from N 1 , N22-dioctadecyldocosa-10, 12-diynediamide, N 1 , N22-dihexadecyldocosa-
  • Diacetylene compounds are well known to a skilled person as compounds capable of forming colour. Typical diacetylene compounds are disclosed for this purpose in WO 2012/114121 , the content of which is incorporated herein by reference. Suitable examples are taught in W02009/093028, WO2010/001171 , WO2010/029329, and WO2013/068729, the content of each of which is incorporated herein by reference.
  • Known methods of synthesis of diacetylene compounds include the formation of a reactive acid chloride and subsequent addition of an amine or alcohol, or the formation of a mixed anhydride and subsequent reactions with an amine or alcohol.
  • the diacetylene compounds of the present invention when they are in the non-coloured state, they are considered to be monomers.
  • the diacetylene compounds have two coloured states, such as a first and second coloured state.
  • These first coloured states of the diacetylene compounds of the present invention are formed on account of polymerisation of these monomers upon exposure to the applied transition stimulus. Polymerisation of at least a portion of the monomers enables the formation of the coloured state of the diacetylene compounds.
  • the inventors consider that the different first and second coloured states are achieved through changes in conjugation of the diacetylene polymer, i.e. a structural change.
  • the second coloured states of the diacetylene compounds can be accessed from the first coloured state by application of applied temperature. It will be understood be a skilled person that a coloured state of the activatable component is stable under ambient conditions.
  • the activatable component may be present in the composition in any suitable amount. It will be appreciated that the amount of activatable component present in the composition will depend upon the other components present in the composition, the application method utilised for applying or incorporating the composition to or into the substrate, the substrate type and the desired end use of the substrate.
  • the composition comprises from 0.1 to 50 %, such as from 0.1 to 40 %, or even from 3 to 30 % of the activatable component based on the total solid weight of the composition.
  • the composition comprises from 5 to 25 % of the activatable component based on the total solid weight of the composition.
  • the applied transition stimulus facilitates the transition of the activatable component from the non-coloured to a coloured state.
  • the activatable component when the activatable component is a diacetylene compound, the diacetylene compound typically has two coloured state, a first and a second coloured state, the first and second coloured states displaying different colours.
  • application of the applied transition stimulus facilitates a transition of the activatable component from the non-coloured to a first coloured state.
  • the second coloured state may be subsequently accessed by the application of an applied temperature to the first coloured state.
  • the applied temperature may be 50 to 200 °C such as from 500 to 180 °C, and be applied by the same means as defined below for the activation temperature.
  • the applied transition stimulus applied to the activatable component is radiation. It will be appreciated that the radiation will be the radiation required to facilitate a transition of the activatable component from the non-coloured to a coloured state.
  • the radiation is selected from gamma radiation with a wavelength of less than 0.01 nm, X-ray radiation with a wavelength of from 0.01 to 10 nm, ultraviolet (UV) radiation with a wavelength of from 10 to 400 nm, and microwave radiation with a wavelength of from 1 mm to 1 m.
  • the applied transition stimulus is ultraviolet (UV) radiation with a wavelength of from 10 to 400 nm, More preferably, the applied transition stimulus is ultraviolet (UV) radiation with a wavelength of from 100 to 400 nm.
  • the applied transition stimulus applied to the activatable component of the composition may be applied to the composition and thus the activatable component using any suitable means. Suitable means include laser excitation through application of radiation to the composition and thus the activatable component by a laser source(s). It will be understood by a skilled person that the applied transition stimulus may be applied at localised positions to selectively develop the coloured state of the activatable component at these localised positions in the composition. These localised positions may overlap with each other. Alternatively, it will be appreciated by a skilled person that the applied transition stimulus may be applied to the composition on or within a substrate by flood illumination, meaning that the composition as a whole is flooded with radiation.
  • any suitable lamp or bulb such as a UV lamp, or medium pressure mercury or amalgam lamp or microwave powered UV lamp, a Xe, Hg or XeHg arc (broadband UV sources); a germicidal lamp, a diode bar; or LED(s).
  • a broadband UV source it will be appreciated that a range of wavelengths over the 10 to 400 nm range will be emitted.
  • the radiation is applied to the composition for an appropriate amount of time required to facilitate the transition of the activatable component from the non-coloured state to a coloured state. Typically the time required to deliver sufficient radiation will depend upon the power of the means used to apply radiation and the method of application i.e.
  • the applied transition stimulus may be applied to the activatable component for less than 120 seconds (such as between 30 to 110 seconds, or even between 75 to 105 seconds), or for less than 60 seconds, such as for less than 20 seconds, or even for less than 10 seconds.
  • the radiation dosage applied can be controlled by alteration of the time for which the radiation is applied, the power of the means used to apply the radiation (wattage) and thus, the fluence (amount of energy delivered per unit area) delivered by a laser source(s), i.e. J/cm 2
  • a coloured state of the activatable component may have any colour.
  • the means used to apply the applied transition stimulus will affect the colour of the coloured state formed.
  • the fluence (amount of energy delivered per unit area) may affect the colour, lightness or intensity of the coloured state formed.
  • the fluence is dependent upon the power of the means used to apply the applied transition stimulus (wattage), and the time for which the applied transition stimulus is applied to a particular localised position on the substrate, which may be controlled by the scanning speed of the laser or the speed of the moving stage. These two variables can be altered to change the fluence. Where the fluence is low (e.g.
  • fluence values may range from 0.01 to 20 J/cm 2 , such as from 0.1 to 10 J/cm 2 and even from 0.5 to 5 J/cm 2 .
  • the coloured state of the activatable component formed following the transition from the non-coloured state is blue.
  • the non-coloured state of the activatable component is‘activated’ prior to the application of the applied transition stimulus such that a transition from the non-coloured state to a coloured state can occur.
  • ‘activation’ is the process of making the non-coloured state of the component capable of undergoing a transition from the non-coloured state to a coloured state, i.e. changing it from an unactivated form (incapable of undergoing such a transition) to an activated form (capable of undergoing such a transition). This is facilitated by the application of an activation temperature.
  • the activation temperature may be any suitable temperature.
  • the activation temperature may be a temperature of from 40 to 140°C.
  • the activation temperature is from 60 to 140 °C, and more preferably, from 70 to 140 °C.
  • the activation temperature may be applied to the activatable component of the composition by any suitable means. Suitable means include laser excitation through application of radiation to the composition and thus the activatable component by a laser source(s). It will be understood by a skilled person that the activation temperature may be applied to the composition at localised positions to selectively activate the non-coloured state of the activatable component at these localised positions in the composition. These localised positions may overlap with each other. Alternatively, it will be appreciated by a skilled person that the activation temperature may be applied to the activatable component by flood illumination, meaning that the composition as a whole is flooded with radiation. This may be done using a lamp or bulb, such as a IR lamp; diode bar; or LED(s).
  • the activation temperature may be applied to the activatable component using a conductive temperature source.
  • Conductive temperature sources include sources of steam and hot air, lamps, hotplates, heat tunnels, LED(s), thermal print heads, thermal conductors, hot liquids and heated substrates. It will be understood by a skilled person that the activation temperature is applied to the composition for an appropriate amount of time required to activate the non-coloured state of the activatable component. Typically the time required to deliver sufficient temperature will depend upon the power of the means used to apply radiation and the method of application i.e. at localised positions, by flood illumination, or using a conductive temperature source.
  • the activation temperature may be applied to the activatable component for less than 120 seconds (such as between 30 to 110 seconds, or even between 75 to 105 seconds) or for less than 60 seconds, such as for less than 20 seconds, or even for less than 10 seconds.
  • the radiation dosage applied to achieve the activation temperature can be controlled by alteration of the time for which the radiation is applied, the power of the means used to apply the radiation (wattage) and thus, the fluence (amount of energy delivered per unit area) delivered by a laser source(s), i.e. J/cm 2
  • the activation temperature may be applied to the activatable component using a combination of the suitable means listed above, i.e. using combinations of laser excitation at localised positions, flood illumination, and a conductive temperature source.
  • the activation temperature may be applied to the activatable component using laser excitation at localised positions, in addition to using a conductive thermal energy source.
  • the activation temperature is applied using radiation, i.e. at localised positions using a laser source(s) or by flood illumination, the composition and thus the activatable component may be exposed to a temperature in excess of the stated temperature ranges for a very short period of time, i.e. microseconds. It will be understood that this will not have any significant effect on the result to be achieved.
  • the activation temperature may be applied to the activatable component using radiation selected from visible radiation with a wavelength of from 400 to 700 nm, and infrared (IR) radiation with a wavelength of from 700 nm to 1 mm, including near-infrared (NIR) radiation with a wavelength of from 700 to 1600 nm.
  • the activation temperature is applied using visible radiation with a wavelength of 400 to 700 nm, infrared (IR) radiation with a wavelength of from 700 nm to 1 mm, in particular infrared (IR) radiation with a wavelength of 10600 nm (using a C0 2 laser) and near-infrared (NIR) radiation with a wavelength of from 700 to 1600 nm.
  • the two additional components of the composition according to the first aspect of the present invention may be any suitable components. It will be appreciated that the selection of the activatable component and the two additional components will be selected based on the colour(s) of their coloured states that can be achieved. Furthermore, the activatable component and two additional components will be selected such that their formation of colour is triggered by different conditions. ‘Different conditions’ encompasses the differing orders of application of the applied transition stimulus, activation temperature and additional temperature or additional applied stimulus, as required, for the formation of colour for each of the two additional components and the activatable component.
  • the two additional components are preferably independently selected from the following component groups (b1 ) to (b5):
  • a pyrazole (thio)semicarbazone compound preferably a pyrazolone semicarbazone compound
  • the composition does not comprise a combination of an activatable component and only components of groups (b3) and (b5).
  • the two additional components independently selected from groups (b1 ) to (b5) are different.
  • the two additional components are selected either from different groups of (b1 ) to (b5) as defined below, or are selected from the same group (b1 ) to (b5), but are selected so as to be different compounds in that group, e.g. two different leuco dyes.
  • the two additional components are independently selected from different groups (b1 ) to (b5).
  • the two additional components may be independently selected from any of the following groups (b1) to (b5): (b1) a pyrazole (thio)semicarbazone compound.
  • pyrazole (thio)semicarbazone compound a compound having a pyrazole group and a (thio) semicarbazone group.
  • the brackets around thio indicate that the moeity may be present or absent.
  • the term pyrazole group encompasses derivatives of a pyrazole group.
  • the pyrazole group is a pyrazolone, including the enol (C-OH) tautomer form.
  • the (thio) semicarbazone group is a semicarbazone.
  • the pyrazole (thio)semicarbazone compound is a pyrazolone semicarbazone compound.
  • the pyrazole (thio)semicarbazone compound is a compound having the formula (III):
  • A is selected from C 6- 12 aryl optionally substituted with C M S alkoxy, - CN, -CF 3 , halogen, -N0 2 , or C M S alkyl, more preferably from C 6 -s aryl, and most preferably phenyl.
  • B is selected from C M S alkyl and C 6- 12 aryl optionally substituted with Ci-is alkoxy, -CN, -CF 3 , halogen, -N0 2 , or C M S alkyl, more preferably from Ci -4 alkyl and C 6 -s aryl, and most preferably from methyl and phenyl.
  • C is selected from C 6- 12 aryl optionally substituted with C M S alkoxy, - CN, -CF 3 , halogen, -N0 2 , or C M S alkyl; -CCI 3 ; and C M S alkyl; more preferably from C 6-8 aryl optionally substituted with Ci -4 alkoxy, -CN, -CF 3 or -N0 2 ; -CCI 3 ; and Ci -4 alkyl, and most preferably, from phenyl, 4-methoxy phenyl, 4- cyanophenyl, 4-(trifluoromethyl)phenyl, 4-nitrophenyl; -CCI 3 ; and C(CH 3 ) 3 .
  • D is selected from C 6- 12 aryl optionally substituted with C M S alkoxy, - CN, -CF 3 , halogen, -N0 2 , or C M S alkyl, more preferably from C 6 -s aryl, and most preferably phenyl.
  • the pyrazole (thio)semicarbazone compound may have the following formula (IV):
  • B is selected from C M S alkyl and C 6- 12 aryl optionally substituted with Ci_ 18 alkoxy, -CN, -CF 3 , halogen, -N0 2 , or Ci-i 8 alkyl, preferably from Ci -4 alkyl and C 6-8 aryl, and more preferably from methyl and phenyl, and
  • C is selected from C 6- 12 aryl optionally substituted with C 1 -18 alkoxy, -CN, -CF 3 , halogen, -N0 2 , or C 1 -18 alkyl; -CCI 3 ; and C 1-18 alkyl; preferably from C 6 -s aryl optionally substituted with Ci -4 alkoxy, -CN, -CF 3 or -N0 2 ; -CCI 3 ; and Ci -4 alkyl, and more preferably, from phenyl, 4-methoxy phenyl, 4-cyanophenyl, 4- (trifluoromethyl)phenyl, 4-nitrophenyl; -CCI 3 ; and C(CH 3 ) 3 .
  • the pyrazole (thio)semicarbazone compound is selected from (£)- 2- ((5-hydroxy-1 ,3-diphenyl-1 /-/-pyrazol-4-yl)(phenyl)methylene)-A/- phenylhydrazine-1 -carboxamide (B and C are phenyl), (£)-2-((5-hydroxy-3- methyl-1 -phenyl-1 /-/-pyrazol-4-yl)(phenyl)methylene)-A/-phenylhydrazine-1 - carboxamide (B is methyl and C is phenyl), (£)-2-((5-hydroxy-1 ,3-diphenyl-1 /-/- pyrazol-4-yl)(4-nitrophenyl)methylene)-A/-phenylhydrazine-1 -carboxamide (B is phenyl and C is 4-nitrophenyl), (£)-2-((5-hydroxy-1 ,3-diphen
  • the pyrazole (thio)semicarbazone compound is selected from (£)- 2- ((5-hydroxy-1 ,3-diphenyl-1 /-/-pyrazol-4-yl)(phenyl)methylene)-A/- phenylhydrazine-1 -carboxamide
  • B and C are phenyl
  • B is phenyl and C is 4-(trifluoromethyl)phenyl
  • keto acid compound a compound having a carboxylic acid group and a ketone group.
  • the keto acid compound is of formula (V):
  • Xi a , X 2a , and X 3a are independently selected from C, N, B and S; the two R groups may be the same or different, and are independently selected from: hydrogen; Ci-i 8 alkyl; C 6 -i 2 aryl optionally substituted with Ci-i 8 alkoxy, -CN, - CF 3 , -N0 2 , halogen, or C M S alkyl; halogen; -N0 2; -CF 3 ; -OR 3 ; -NR 3 2 ; -CN; -SR 3 ; - COR 3 ; -C0 2 R 3 ; and -CONR 3 2 ; wherein R 3 is selected from an alkali metal; hydrogen; Ci-i 8 alkyl; and C 6 -i 2 aryl optionally substituted with Ci-i 8 alkoxy, -CN, - CF 3 , -N0 2 , halogen, or C M S alkyl; or both R groups
  • A may be the same as or different to B’ (defined below), and is independently selected from: hydrogen; Ci-i 8 alkyl; C 6-i2 aryl optionally substituted with C M S alkoxy, -CN, -CF 3 , -N0 2 , halogen, or C M S alkyl; a heterocyclic ring; a heteroaryl; halogen; -N0 2 ; -CF 3 ; -OR 3 ; -NR 3 2 ; -CN; -SR 3 ; -COR 3 ; -C0 2 R 3 ; -CONR 3 2 ; wherein R 3 is selected from an alkali metal; hydrogen; Ci-i 8 alkyl; and C 6-i2 aryl optionally substituted with C M S alkoxy, -CN, -CF 3 , -N0 2 , halogen, or C M S alkyl; and R 1 is selected from
  • Xi b , X 2b , X3 b and X 4b are independently selected from C, N, B and S; and B’ is the same or different to A and is independently selected from hydrogen; C1-18 alkyl; C 6- 12 aryl optionally substituted with C 1-18 alkoxy, -CN, -CF 3 , -N0 2 , halogen, or C M S alkyl; a heterocyclic ring; a heteroaryl; halogen; -N0 2; -CF 3; - OR 3 ; -NR 3 2 ; -CN; -SR 3 ; -COR 3 ; -C0 2 R 3 ; -CONR 3 2 ; wherein R 3 is selected from an alkali metal; hydrogen; Ci-i 8 alkyl; and C 6 -i 2 aryl optionally substituted with Ci_ 18 alkoxy, -CN, -CF 3 , -N0 2 , halogen, C M S alkyl
  • a and B’ may constitute a substituent at a single position on the benzene ring to which each of A and B’ relates or A and B’ may constitute multiple independently selected substituents at any of the available positions on the benzene ring to which each of A and B’ relates.
  • the benzene ring to which B’ relates may be substituted with a single substituent or up to 4 independently selected substituents.
  • keto acid compound is selected from formula (VI):
  • keto acid compound is selected from formula (VII):
  • R and B’ are as described above for formula (V).
  • the two R groups are the same and are selected from Ci-i 8 alkyl; and C 6-i2 aryl optionally substituted with C M S alkoxy, -CN, -CF 3 , -N0 2 , halogen, or C M S alkyl. More preferably, the two R groups are the same and C M S alkyl, more preferably Ci -6 alkyl.
  • B’ is independently selected from hydrogen; -N0 2 and halogen, more preferably, hydrogen and chlorine, and most preferably hydrogen.
  • the keto acid compound is selected from2-(4-(dimethylamino)-2- hydroxybenzoyl)benzoic acid, 2-(4-(dibutylamino)-2-hydroxybenzoyl)benzoic acid, 2-(4-(diethylamino)-2-hydroxybenzoyl)benzoic acid, and 2, 3,4,5- tetrachloro-6-(4-(diethylamino)-2-hydroxybenzoyl)benzoic acid.
  • 2-(4-(dimethylamino)-2-hydroxybenzoyl)benzoic acid More preferably, 2-(4-(dimethylamino)-2-hydroxybenzoyl)benzoic acid, 2-(4-(dibutylamino)-2- hydroxybenzoyl)benzoic acid, and 2-(4-(diethylamino)-2-hydroxybenzoyl)benzoic acid.
  • keto acid compounds of formulas (V) to (VII) are commercially available, for example, they can be sourced from Chameleon Speciality Chemicals Limited. All references to the components of formulas (V) to (VII) are to be interpreted as covering the components of the formulas (V) to (VII) per se, and also, all tautomers or isomers thereof.
  • the keto acid compound may be in the form of a‘dimer’, whereby B’ denotes a -C0 2 R 3 group (where R 3 is hydrogen such that the benzene ring carries two carboxyl groups) and also, an independently selected -COR 3 group, where R 3 is a C 6- 12 aryl substituted with hydroxyl (-OH) and NR 2 , wherein R is as defined above for formula (V).
  • the -C0 2 R 3 group (where R 3 is hydrogen such that the benzene ring carries two carboxyl groups) is at X 2b and the -COR 3 group is at X 3b .
  • Leuco dyes are well known to a skilled person as compounds capable of forming colour. They can be photochromic (change colour on exposure to light such as UV light), chemochromic, thermochromic or halochromic (change colour on exposure to change in environmental pH). Examples of suitable leuco dyes are contained in WO2015/015200 and WO2013/068729, the content of which is incorporated by reference. Suitable leuco dyes include, but are not limited to any commercially available or chemically synthesisable leuco dye, including but not limited to: commercially available photochromic, thermochromic, chemochromic, and halochromic leuco dyes.
  • leuco dyes include, but are not limited to: spiroxazines, naphthopyrans, phthalides, fluorans, triarylmethanes, benzoxazines, quinazolines, spiropyrans, quinones, tetrazolium salts, thiazines, phenazines and oxazines.
  • Suitable suppliers of leuco dyes include, but are not limited to: Yamada Chemical Company Limited, Chameleon Speciality Chemicals Limited, and Connect Chemicals.
  • the leuco dye may be selected from: 2-Anilino-3-diethylamino-6-methylfluoran (Chameleon Black 1 ), 2-Anilino-6-dibutylamino-3-methylfluoran (Chameleon Black 2), 6-(Dimethylamino)-3,3-bis [4-(dimethylamino) phenyl] phthalide (Chameleon Blue 3), 4,4'-[(9-butyl-9H-carbazol-3-yl)methylene]bis[N-methyl-N- phenylaniline] (Chameleon Blue 4), 3,3'-Bis(1 -n-octyl-2-methylindol-3- yl)phthalide (Chameleon Red 5), 6'-(Diethylamino)-3-oxo-spiro [isobenzofuran- 1 (3H),9'-[9H] xanthene]-2'-carboxylic acid ethy
  • the leuco dye is -(dimethylamino)-3,3-bis [4-(dimethylamino) phenyl] phthalide (Chameleon Blue 3), 7-[4-(diethylamino)-2-ethoxyphenyl]-7-(2-methyl- 1 -octyl-1 H-indol-3-yl) furo[3,4-b]pyridin-5(7H)-one (Chameleon Blue 8), 3,3'- bis(1 -n-octyl-2-methylindol-3-yl)phthalide (Chameleon Red 5), 2-anilino-3- diethylamino-6-methylfluoran (Chameleon Black 1 , ODB-1 ), 2-anilino-6- dibutylamino-3-methylfluoran, (Chameleon Black 2, ODB-2), N,N-dimethyl-4-[2- [2-(octyloxy)phenyl]-6-
  • a compound formed from a salicylic aldehyde or salicylic ketone compound is meant a compound formed from a parent salicylic aldehyde or salicylic ketone compound (aldehyde or ketone derivatives of salicylic acid).
  • the compound formed from a salicylic aldehyde or salicylic ketone compound is a compound formed from the condensation reaction of a linked primary diamine and independently selected from two salicylic aldehyde or salicylic ketone compounds.
  • linked primary diamine a compound comprising two primary amine groups joined by a carbon chain of 0 to 20 carbon atoms, preferably 0 to 10 carbon atoms, more preferably 0 to 8 carbon atoms, and most preferably 0 to 6 carbon atoms.
  • the compound formed from a salicylic aldehyde or salicylic ketone compound is a compound formed from the condensation reaction of hydrazine and independently selected from two salicylic aldehyde or salicylic ketone compounds.
  • the compound formed from a salicylic aldehyde or salicylic ketone compound may have the following formula (VIII):
  • R 1 and R 2 may be the same or different and are independently selected from hydrogen; halogen; hydroxyl; C M S alkoxy; C M S alkyl; C M S cycloalkyl; a primary, secondary or tertiary amino group; -CN; -N0 2 ; -CF 3 ; -COOH; -COR 3 ; - CONR 3 2 ; a heterocyclic ring; a heteroaryl and Ce- ⁇ aryl optionally substituted with C1-18 alkoxy, -CN, -CF 3 , -N0 2 , halogen, or C M S alkyl; R 3 and R 4 may be the same or different and are independently selected from hydrogen, Ci-i 8 alkyl, Ce- ⁇ aryl, and Ci-i 8 alkyl-C 6 -i2aryl; and
  • Xia, X 2a , X 3a , X 4a , Xi b , X 2b , Xs b and X 4b are independently selected from C, N or S.
  • R 1 and R 2 may constitute a substituent at a single position on the benzene ring to which each of R 1 and R 2 relates or R 1 and R 2 may constitute multiple independently selected substituents at any of the available positions on the benzene ring to which each of R 1 and R 2 relates.
  • R 1 or R 2 may constitute a single substituent on the benzene ring to which it relates, or R 1 or R 2 may constitute two substituents on the benzene ring to which it relates, the two substituents being different and situated at different positions on the benzene ring.
  • R 1 or R 2 may constitute a single substituent on the benzene ring to which it relates, or R 1 or R 2 may constitute two substituents on the benzene ring to which it relates, the two substituents being different and situated at different available positions on the benzene ring.
  • R 1 and R 2 are the same and are selected from hydrogen; halogen; hydroxyl; C M S alkoxy including methoxy; C M S alkyl including methyl, tertiary butyl and isopropyl; a secondary amino group (including -NR 2 wherein R is Ci -6 alkyl such as diethylamino and dimethylamino); -CN, -N0 2 , -CF 3 , -COOH; C 6- i 2 aryl optionally substituted with C M S alkoxy, -CN, -CF 3 , -N0 2 , halogen, or C M S alkyl, including phenyl; and a heterocyclic ring such as pyridyl.
  • R 1 and R 2 are the same and are selected from hydrogen; halogen; hydroxyl; Ci_ i 8 alkoxy including methoxy; a secondary amino group (including -NR 2 wherein R is Ci-e alkyl such as diethylamino and dimethylamino); and N0 2 .
  • R 3 and R 4 are the same and are selected from hydrogen and Ci_ i 2 alkyl. More preferably, R 3 and R 4 are the same and are selected from hydrogen and Ci -6 alkyl. Most preferably, R 3 and R 4 are the same and are hydrogen.
  • Xi a , X 2a , X3 a , X 4a , Xi b , X2 b , X3 b and X 4b are independently selected from C or N. More preferably, Xi a , X 2a , X3 a , X 4a , Xi b , X2 b , X3 b and X 4b are C.
  • the compound formed from a salicylic aldehyde or salicylic ketone compound may have the following formula (IX):
  • R 1 , R 2 , R 3 , R 4 and Xi a , X 2a , X3 a , X 4a , Xi b , X2 b , X3 b and X 4b are as defined above for formula (VIII).
  • the compound formed from a salicylic aldehyde or salicylic ketone compound is 2,2'-((1 E,TE)-hydrazine-1 ,2- diylidenebis(methaneylylidene))diphenol, 6,6'-((1 E, 1 '£)-hydrazine-1 ,2- diylidenebis(methaneylylidene))bis(3-nitrophenol), 3,3’-((1 E,1’E)-hydrazine-1 ,2- diylidenebis(methaneylylidene))bis(benzene-1 ,2-diol), 6,6’-((1 E,1’E)-hydrazine- 1 ,2-diylidenebis(methaneylylidene))bis(4-bromo-2-methoxyphenol), 6,6’-
  • the compound formed from a salicylic aldehyde or salicylic ketone compound is 6,6’- ((1 E, 1’E)-hydrazine-1 ,2-diylidenebis(methaneylylidene))bis(3-nitrophenol).
  • oxyanions of multivalent metals in laser-markable compositions is disclosed in US7485403, the content of which is incorporated herein by reference.
  • a particularly preferred oxyanion is ammonium octamolybdate (NH 4 ) 4 MO 8 0 26 or“AOM”, which is a commercially available molybdenum composition with the CAS number 12411-64-2.
  • the AOM pigment will typically be formulated together with a binder, e.g. a polymeric binder, in the compositions of the invention.
  • Suitable oxyanions include molybdate, tungstate or analogous transition metal compounds, including di- and hept-molybdates.
  • the oxyanion of a multivalent metal is ammonium octamolybdate (AOM).
  • the selection of the additional applied stimulus or additional temperature is dependent upon the nature of the selected additional component.
  • an additional component is a compound of formula (III) or (IV), a compound of formula (V), (VI) or (VII), a leuco dye or a compound of formula (VIII) or (IX)
  • the additional applied stimulus may be utilised to facilitate a transition from the non-coloured state to a coloured state of the additional component.
  • the additional component is a compound of formula (III) or (IV), a compound of formula (V), (VI) or (VII), a leuco dye, an oxyanion of a multivalent metal or a compound of formula (VIII) or (IX), the additional temperature may be utilised to facilitate a transition from the non-coloured state to a coloured state of the additional component.
  • the additional component when the additional component is a compound of formula (III) or (IV), the additional component may be accompanied in the composition by an acid or base-generating agent.
  • an acid or base-generating agent It will be appreciated by a skilled person that the acid or base-generating agent and the additional component of formula (III) or (IV) interact to achieve colour formation.
  • the acid- or base-generating agent is present to facilitate a pH change through generation of acid or base (for the acid- generating or base-generating agents respectively) upon application of the additional applied stimulus or additional temperature to the composition and thus the compound of formula (III) or (IV) and acid or base-generating agent. This acid or base generation facilitates the transition of the additional component of formula (III) or (IV) to transition from a non-coloured state to a coloured state.
  • cid is meant any molecular entity or chemical species capable of donating a hydrogen (proton) or capable of forming a covalent bond with an electron pair.
  • base is meant a chemical species or molecular entity having an available pair of electrons capable of forming a covalent bond with a proton, or with a vacant orbital of some other species.
  • Suitable acid-generating agents include any suitable commercially available or chemically synthesisable acid-generating agents.
  • Suitable acid-generating agents include, but are not limited to the following: thermal acid-generating agents (TAGs) based on amine salts of borobenzilate and tri-n-butylammonium borodisalicylate; photoacid-generating agents such as but not limited to triphenylsulfonium triflate, triphenylsulfonium hexafluorophosphate, triphenylsulfonium perluorobutane sulfonate, triphenylsulfonium trifluoromethylsulfonate, N-phenylbis(trifluoromethanesulfonimide), Bisphenol derivatives including but not limited to bisphenol A, bisphenol F, bisphenol S, bisphenol E, bisphenol B, bisphenol AF, bisphenol AP, and bisphenol BP.
  • Suitable photoacid-generating agents include those described in US 89327
  • Suitable base-generating agents include any suitable commercially available or chemically synthesisable base-generating agents.
  • Suitable base-generating agents include, but are not limited to the following: thermal base-generating agents such as n-phenyliminodiacetic acid, 1 ,2-bis(2-aminophenoxy)-ethane- N,N,N’,N’-tetraacetic acid, and N-methylpyridinium oxalate; and photobasic- generating agents such as 9-anthrylmethyl 4’-nitrophenylcarbonate, 9- anthrylmethyl 1 -piperidinecarboxylate, and 2-anthraquinonylmethyl 4’nitrophenylcarbonate.
  • Suitable thermal base-generating agents include those described in WO2015199219 and photobase-generating agents include those described in EP2368875, the content of each of which is incorporated herein by reference.
  • the selection of the additional applied stimulus or additional temperature is dependent upon the nature of the acid- or base-generating agent accompanying the compound of formula (III) or (IV). It will be appreciated by a skilled person that the additional applied stimulus is utilised to facilitate a transition when a photoacid- or photobase-generating agent is present in relation to the compound of formula (INI) or (IV), and the additional temperature is utilised to facilitate a transition when a thermal acid- or base-generating agent is present in relation to the compound of formula (III) or (IV).
  • the additional component is a compound of formula (V), (VI) or (VII) or a leuco dye
  • the additional component is accompanied in the composition by an acid-generating agent, the acid-generating agent being as described above.
  • the additional applied stimulus or additional temperature is applied to the composition as described above to facilitate a transition from the non-coloured to the coloured state of the additional component.
  • the acid-generating agent and the additional component of formula (V), (VI) or (VII) or a leuco dye interact to achieve colour formation.
  • the acid- generating agent is present to facilitate a pH change through generation of acid upon application of the additional applied stimulus or additional temperature to the composition and thus the additional component and acid -generating agent. This acid generation facilitates the transition of the additional component of formula (V), (VI) or (VII) or the leuco dye from a non-coloured state to a coloured state.
  • the selection of the acid-generating agent is dependent upon the particular compound of formula (V), (VI) or (VII), or leuco dye utilised in the composition. It will further be appreciated by the skilled person that the selection of the additional applied stimulus or additional temperature is dependent upon the nature of the acid-generating agent accompanying the compound of formula (V), (VI) or (VII), or the leuco dye.
  • the additional applied stimulus is utilised to facilitate a transition when a photoacid-generating agent is present in relation to the compound of formula (V), (VI) or (VII), or lecuo dye
  • the additional temperature is utilised to facilitate a transition when a thermal acid-generating agent is present in relation to the compound of formula (V), (VI) or (VII), or a leuco dye.
  • the additional component is a compound of formula (VIII) or (IX)
  • the additional component is preferably accompanied in the composition by an acid- or base-generating agent, the acid- or base-generating agent being as described above.
  • the additional applied stimulus or additional temperature is applied to the composition as described above to facilitate a transition from the non- coloured to the coloured state of the compound of formula (VIII) or (IX).
  • the acid- or base-generating agent is present to facilitate a pH change through generation of acid or base upon application of the additional applied stimulus or additional temperature to the composition and thus the additional component and acid- or base-generating agent. This acid or base generation facilitates the transition of the additional component of formula (VIII) or (IX) to transition from a non-coloured state to a coloured state.
  • the selection of the additional applied stimulus or additional temperature is dependent upon the nature of the acid- or base-generating agent accompanying the compound of formula (VIII) or (IX). It will be appreciated by a skilled person that the additional applied stimulus is utilised to facilitate a transition when a photoacid- or photobase-generating agent is present in relation to the compound of formula (VIII) or (IX), and the additional temperature is utilised to facilitate a transition when a thermal acid- or base-generating agent is present in relation to the compound of formula (VIII) or (IX).
  • the additional applied stimulus is radiation. It will be appreciated that the radiation will be the radiation required to facilitate a transition of the additional compound from the non-coloured to a coloured state. The radiation selected will therefore be dependent upon the additional component present in the composition.
  • the radiation is selected from gamma radiation with a wavelength of less than 0.01 nm, X-ray radiation with a wavelength of from 0.01 to 10 nm, and microwave radiation with a wavelength of from 1 mm to 1 m.
  • the additional applied stimulus is selected ultraviolet (UV) radiation with a wavelength of from 10 to 400 nm. More preferably, the additional applied stimulus is selected from ultraviolet (UV) radiation with a wavelength of from 100 to 400 nm.
  • the additional applied stimulus may be applied to the additional component of the composition by any suitable means. Suitable means include laser excitation through application of radiation to the composition and thus the fourth component by a laser source(s). It will be understood by a skilled person that the additional applied stimulus may be applied to the composition at localised positions to selectively develop the coloured state of the additional component at these localised positions in the composition. These localised positions may overlap with each other. Alternatively, it will be appreciated by a skilled person that the additional applied stimulus may be applied to the composition on or within the substrate by flood illumination, meaning that the composition as a whole is flooded with radiation.
  • any suitable lamp or bulb such as a UV lamp, or medium pressure mercury or amalgam lamp or microwave powered UV lamp, a Xe, Hg or XeHg arc (broadband UV sources); a germicidal lamp, a diode bar; or LED(s).
  • a broadband UV source it will be appreciated by a skilled person that a range of wavelengths will be emitted over the 10 to 400 nm range.
  • the radiation is applied to the composition for an appropriate amount of time required to facilitate the transition of the additional component from the non-coloured state to the coloured state. Typically the time required to deliver sufficient radiation will depend upon the power of the means used to apply radiation and the method of application i.e.
  • the additional applied stimulus may be applied to the additional component for less than 120 seconds (such as between 30 to 110 seconds, or even between 75 to 105 seconds), or for less than 60 seconds, such as for less than 20 seconds, or even for less than 10 seconds.
  • the radiation dosage for the additional applied stimulus can be controlled by alteration of the time for which the radiation is applied, the power of the means used to apply the radiation (wattage) and thus, the fluence (amount of energy delivered per unit area) delivered by a laser source(s), i.e. J/cm 2
  • the additional temperature may be any suitable temperature. It will be appreciated by a skilled person that the additional temperature will be a temperature required to facilitate a transition of the additional component from the non-coloured to a coloured state. The additional temperature will therefore be selected dependent upon the additional component present in the composition.
  • the additional temperature may be a temperature of from 50 to 300 °C. Preferably, the additional temperature is from 50 to 250 °C, or even from 80 to 200 °C.
  • the additional temperature may be applied to the additional component of the composition by any suitable means. Suitable means include laser excitation through application of radiation to the composition and thus the additional component by a laser source(s). It will be understood by a skilled person that the additional temperature may be applied to the composition at localised positions to selectively develop the coloured state of the additional component at these localised positions in the composition. These localised positions may overlap with each other. Alternatively, it will be appreciated by a skilled person that the additional temperature may be applied to the additional component by flood illumination, meaning that the composition as a whole is flooded with radiation. This may be done using a lamp or bulb, such as a IR lamp; diode bar; or LED(s).
  • a lamp or bulb such as a IR lamp; diode bar; or LED(s).
  • the additional temperature may be applied to the additional component using a conductive temperature source.
  • Conductive temperature sources include sources of steam and hot air, lamps, heat tunnels, hotplates, LED(s), thermal print heads, thermal conductors, hot liquids and heated substrates.
  • the additional temperature is applied to the composition for an appropriate amount of time required to facilitate the transition of the additional component from the non- coloured to the coloured state. Typically the time required to deliver sufficient temperature will depend upon the power of the means used to apply radiation and the method of application i.e. at localised positions, by flood illumination, or using a conductive temperature source.
  • the additional temperature may be applied to the additional component for less than 120 seconds (such as between 30 to 110 seconds, or even between 75 to 105 seconds), or for less than 60 seconds, such as for less than 20 seconds, or even for less than 10 seconds.
  • the additional temperature can be controlled by alteration of the time for which the radiation is applied, the power of the means used to apply the radiation (wattage) and thus, the fluence (amount of energy delivered per unit area) delivered by a laser source(s), i.e. J/cm 2
  • the additional temperature may be applied to the additional component using a combination of the suitable means listed above, i.e. using combinations of laser excitation at localised positions, flood illumination, and a conductive temperature source.
  • the additional temperature may be applied to the additional component using laser excitation at localised positions, in addition to using a conductive thermal energy source.
  • the additional temperature is applied using radiation, i.e. at localised positions using a laser source(s) or by flood illumination
  • the composition and thus the additional component may be exposed to a temperature in excess of the stated temperature ranges for a very short period of time, i.e. microseconds. It will be understood that this will not have any significant effect on the result to be achieved.
  • the additional temperature may be applied to the additional component using radiation selected from visible radiation with a wavelength of from 400 to 700 nm, and infrared (IR) radiation with a wavelength of from 700 nm to 1 mm, including near-infrared (NIR) radiation with a wavelength of from 700 to 1600 nm.
  • the additional temperature is applied using infrared (IR) radiation with a wavelength of from 700 nm to 1 mm, infrared radiation with a wavelength of 10600 nm (using a C0 2 laser), near-infrared (NIR) radiation with a wavelength of 700 to 1600 nm, and visible radiation with a wavelength of from 400 to 700 nm.
  • the coloured state of the additional component may have any colour.
  • the means used to apply the additional applied stimulus or additional temperature will affect the colour of the coloured state formed.
  • the fluence amount of energy delivered per unit area
  • the fluence is dependent upon the power of the means used to apply the additional applied stimulus or additional temperature (wattage), and the time for which the additional applied stimulus or additional temperature is applied to a particular localised position on the substrate, which can be controlled by the scanning speed of the laser or the speed of the moving stage.
  • the coloured state of the additional component will be of a less intense colour
  • the fluence is high (e.g. higher power and/or longer irradiation times)
  • the coloured state of the additional component will be of a more intense colour.
  • Changing the fluence may also result in the additional component changing colour.
  • low fluence may form a coloured state of the additional component having a yellow colour
  • higher fluence may form the same coloured state but having an orange or red colour. This is particularly applicable for (b1 ), (b2) and (b4).
  • fluence values may range from 0.01 to 20 J/cm 2 , such as from 0.1 to 10 J/cm 2 and even from 0.5 to 5 J/cm 2
  • the required fluence from the additional applied stimulus or additional temperature to facilitate a transition from the non-coloured state to a coloured state of the additional component may be different to the required fluence from the applied transition stimulus.
  • the required fluence from the additional applied stimulus or additional temperature will be different to the require fluence from the applied transition stimulus.
  • the two additional components of the composition according to the first aspect of the present invention cannot be selected to both by accompanied by an acid- or base-generating agent, i.e. the composition may only comprise one acid- or base-generating agent.
  • the two additional components will be selected such that only one requires an acid- or base-generating agent, or in certain instances, the acid- or base-generating agent associated with one of the two components will also interact with the other of the two components as discussed above.
  • the additional components are selected from a pyrazole (thio)semicarbazone compound, an oxyanion of a multivalent metal, a leuco dye and a keto acid compound. More preferably, the additional components are an oxyanion of a multivalent metal in combination with a pyrazole
  • a composition comprising the activatable component and two additional component enables the production of a broad range of colours in the formation of an image.
  • the different applied transition stimulus, activation temperature and additional applied stimulus or additional temperature can be applied in different combinations as required across the whole composition or at particular localised positions, enabling the formation many different colours. It will be appreciated that the stimuli and temperatures used are dependent upon the components present in the composition. The invention thus enables the formation of desired single- and multi-coloured images with a broad colour gamut.
  • the colours of the coloured states of the two additional components are independently selected from red, orange, black and yellow.
  • the additional components may individually be present in the composition in any suitable amount. It will be appreciated that the amount of the additional components individually present in the composition will depend upon the other components present in the composition, the application method utilised for applying or incorporating the composition to or into the substrate, the substrate type and the desired end use of the substrate.
  • the composition comprises from 0.1 to 50%, such as from 0.1 to 40 %, or even from 3 to 30 % of an additional component based on the total solid weight of the composition. Most preferably, the composition comprises from 5 to 30 % of the additional component based on the total solid weight of the composition.
  • the acid or base-generating agent relating to an individual additional component may be individually present in the composition in any suitable amount.
  • the ratio of the acid or base-generating agent to the additional component to which it is related based on the total solid weight of the composition is between 4:1 to 1 :4, more preferably between 3:1 to 1 :3, and most preferably, between 2:1 to 1 :2.
  • the composition comprises from 0 to 50 %, such as from 5 to 40 %, or even from 5 to 35% of the acid or base- generating agent based on the total solid weight of the composition.
  • the composition comprises from 10 to 40 %, or even 10 to 35% of the acid or base-generating agent based on the total solid weight of the composition.
  • the two additional components in the composition according to the first aspect of the present invention are independently selected from (b1 ) a pyrazole (thio)semicarbazone compound, (b2) a keto acid compound, (b3) a leuco dye, and (b4) a compound formed from a salicylic aldehyde or salicylic ketone compound.
  • the composition according to the first aspect of the present invention comprises: a) an activatable component capable of transitioning from a non-coloured state to a coloured state, the transition being effected by the application of an applied transition stimulus, wherein the activatable component requires activation to allow transitioning to occur, where said activation occurs by application of an activation temperature; and
  • two additional components each capable of transitioning from a non- coloured state to a coloured state, the transition being effected by the application of an additional applied stimulus or an additional temperature; wherein, if formed, the coloured states of the activatable component and each of the two additional components are different in colour, and wherein the two additional components are independently selected from (b1 ) a pyrazole (thio)semicarbazone compound, (b2) a keto acid compound, (b3) a leuco dye, and (b4) a compound formed from a salicylic aldehyde or salicylic ketone compound.
  • the two additional components in the composition according to the first aspect of the present invention are independently selected from (b1 ) a pyrazole (thio)semicarbazone compound, (b2) a keto acid compound, (b4) a compound formed from a salicylic aldehyde or salicylic ketone compound, and (b5) an oxyanion of a multivalent metal.
  • the composition according to the first aspect of the present invention comprises: a) an activatable component capable of transitioning from a non-coloured state to a coloured state, the transition being effected by the application of an applied transition stimulus, wherein the activatable component requires activation to allow transitioning to occur, where said activation occurs by application of an activation temperature; and
  • two additional components each capable of transitioning from a non- coloured state to a coloured state, the transition being effected by the application of an additional applied stimulus or an additional temperature; wherein, if formed, the coloured states of the activatable component and each of the two additional components are different in colour, and wherein the two additional components are independently selected from (b1 ) a pyrazole (thio)semicarbazone compound, (b2) a keto acid compound, (b4) a compound formed from a salicylic aldehyde or salicylic ketone compound, and (b5) an oxyanion of a multivalent metal.
  • compositions according to the first aspect of the present invention are independently selected from (b1 ) a pyrazole (thio)semicarbazone compound, (b2) a keto acid compound, and (b4) a compound formed from a salicylic aldehyde or salicylic ketone compound.
  • composition according to the first aspect of the present invention comprises: a) an activatable component capable of transitioning from a non-coloured state to a coloured state, the transition being effected by the application of an applied transition stimulus, wherein the activatable component requires activation to allow transitioning to occur, where said activation occurs by application of an activation temperature; and
  • two additional components each capable of transitioning from a non- coloured state to a coloured state, the transition being effected by the application of an additional applied stimulus or an additional temperature; wherein, if formed, the coloured states of the activatable component and each of the two additional components are different in colour, and wherein the two additional components are independently selected from (b1 ) a pyrazole (thio)semicarbazone compound, (b2) a keto acid compound, and (b4) a compound formed from a salicylic aldehyde or salicylic ketone compound.
  • the two additional components in the composition according to the first aspect of the present invention are independently selected from (b1 ) a pyrazole (thio)semicarbazone and any of (b2) a keto acid compound, (b3) a leuco dye, (b4) a compound formed form a salicylic aldehyde or salicylic ketone compound, and (b5) an oxyanion of a multivalent metal.
  • the two additional components in the composition according to the first aspect of the present invention are independently selected from (b5) an oxyanion of a multivalent metal and either of (b2) a keto acid compound, and (b4) a compound formed from a salicylic aldehyde or salicylic ketone compound.
  • the composition comprises an activatable component, a keto acid compound and an oxyanion of a multivalent metal.
  • the composition according to the first aspect of the present invention may further comprise a binder.
  • Suitable binders will be well known to a person skilled in the art. Examples of suitable binders include, but are not limited to the following: polymeric binders such as acrylic polymers, styrene polymers and hydrogenated products thereof; vinyl polymers; polyolefins and hydrogenated or epoxidised products thereof; aldehyde-containing polymers; epoxide-containing polymers; polyamides; polyesters; polyurethanes; sulphone-containing polymers; natural products and derivatives thereof; and combinations thereof.
  • the binder may be present in the composition in any suitable amount.
  • the composition comprises from 1 to 50 %, such as from 5 to 40 % and most preferably, from 10 to 35 % of binder based on the total solid weight of the composition.
  • the composition according to the first aspect of the present invention may further comprise a near-infrared (NIR) absorber.
  • NIR near-infrared
  • an NIR absorber may be utilised when NIR radiation is to be utilised, the NIR absorber being capable of enhancing absorption of the NIR radiation.
  • NIR absorbers include, but are not limited to the following: inorganic copper salts such as copper (II) hydroxyl phosphate; organic NIR dyes and pigments such as N,N,N’,N’-tetrakis(4-dibutylaminophenyl)-p-benzoquinone bis(iminium hexafluoro-antimonate); non-stoichiometric inorganic compounds such as reduced indium tin oxide, reduced zinc oxide, reduced tungsten oxide (tungsten bronze), reduced antimony tin oxide, or doped metal oxides such as aluminium-doped zinc oxide (AZO) and fluorine-doped tin oxide (FTO); conductive polymers such as poly polystyrene sulfonate (PEDOT); and combinations thereof.
  • inorganic copper salts such as copper (II) hydroxyl phosphate
  • organic NIR dyes and pigments such as N,N,N’,N’-tetrakis(
  • the NIR absorber is a non-stoichiometric inorganic compound.
  • the composition comprises from 0.05 to 5 %, such as from 0.05 to 4 % and most preferably, from 0.05 to 3 % of an NIR absorber based on the total solid weight of the composition.
  • composition according to the first aspect of the present invention may further comprise a curable compound.
  • Suitable curable compounds will be well known to a person skilled in the art. Examples of suitable curable compounds include, but are not limited to: any commercially available monomers, oligomers, monomer and oligomer mixtures, or photoinitiators.
  • the curable compound may be present in the composition in any suitable amount.
  • the composition according to the first aspect of the present invention may further comprise an additive or combination of additives.
  • suitable additives will be well known to a person skilled in the art.
  • suitable additives include, but are not limited to the following: polymers; light or energy absorbing agents; UV absorbers; surfactants; wetting agents; drying promoters; colourants such as pigments; tinting agents; fluorescent agents; plasticisers; optical brighteners; oxidising or reducing agents; stabilisers; light stabilising agents such as hindered amines; rheology modifiers such as thickening or thinning agents; humectants; adhesion promotors; acid or base scavenging agents; retarders; defoamers; antifoaming agents; and combinations thereof.
  • the composition comprises 0.1 to 7 %, such as from 0.1 to 5%, or even from 0.1 to 3 % of additives based on the total solid weight of the composition.
  • the composition according to the first aspect of the present invention may further comprise a solvent.
  • the composition may comprise a single solvent or a mixture of solvents.
  • the solvent may comprise water, an organic solvent, a mixture of water and an organic solvent, or a mixture of organic solvents.
  • Suitable organic solvents include, but are not limited to the following: alcohols such as ethanol, n-propanol, isopropanol and n-butanol; esters such as ethyl acetate, butyl acetate, and n-hexyl acetate; aromatic hydrocarbons such as benzene, toluene, xylene, and solvent naphtha 100, 150, 200; ketones such as acetone, cyclohexanone, methylisobutyl ketone, and methyl ethyl ketone; glycols such as butyl glycol; glycol ethers such as methoxy propanol, ethylene glycol monomethyl ether,
  • composition according to the first aspect of the present invention preferably comprises, in addition to the activatable component and two additional components and optional acid- or base-generating agent(s), a binder, an additive or combination of additives, and a solvent or combination of solvents. If near infrared is to be used to provide the applied transition stimulus or activation temperature, an NIR absorber is preferably present in the composition.
  • the composition according to the first aspect of the present invention may have a viscosity of from 14 to 120 Zahn seconds (efflux time), suitably measured using a Zahn cup #2 viscosity measurement device at a temperature of 16 to 30 °C. It will be appreciated that the viscosity of the composition is dependent upon a number of factors, including the number, type and amount of the components present in the composition, in addition to the printing application and desired coat weight of the composition when applied on a substrate.
  • composition according to the first aspect of the present invention may be formed through the combination of formulations containing the different components of the composition, for example the activatable component and each of the two additional components may be in separate formulations, the formulations being combined together to form the composition according to the first aspect of the present invention.
  • formulations comprise components such as binders, solvents and additives.
  • composition comprising an activatable component and two additional components enables the production of a broad range of colours in the formation of an image.
  • the different applied transition stimulus, additional applied stimulus, additional temperature, activation temperature can be applied in different combinations at particular localised positions, enabling the formation of many different colours.
  • the invention thus enables the formation of desired single- and multi-coloured images with a broad colour gamut.
  • composition according to the first aspect of the present invention may be applied to or incorporated within any suitable substrate. It will be appreciated by a skilled person that the components of a composition will likely vary depending on the substrate to which the composition is to be applied or incorporated within.
  • a substrate comprising the composition according to the first aspect of the present invention applied to or incorporated within.
  • suitable substrates to which the composition may be applied include, but are not limited to: polymers and recycled polymer materials such as polyethylene terephthalate (PET), polyethylene (PE), low density polyethylene (LDPE), high density polyethylene (HDPE), polystyrene (PS), polypropylene (PP), orientated polypropylene (OPP), biaxially orientated polypropylene (BOPP), cast polypropylene (CPP), polyamide (PA) such as nylon, polyvinyl chloride (PVC), or combinations thereof; cellulose; glass; plastic; metal and metal foils; textiles; paper; corrugated paperboard, cardboard, and equivalent recycled analogues, or combinations thereof; ceramics; foodstuffs and pharmaceutical preparations; or combinations thereof, e.g.
  • PET polyethylene terephthalate
  • PE polyethylene
  • LDPE low density polyethylene
  • HDPE high density polyethylene
  • PS polystyrene
  • PP polypropylene
  • OPP orientated polypropylene
  • the polymer and recycled polymer materials may be in the form of polymer film substrates.
  • suitable substrates within which the composition may be incorporated include, but are not limited to: polymers and recycled polymer materials such as polyethylene terephthalate (PET), polyethylene (PE), low density polyethylene (LDPE), high density polyethylene (HDPE), polystyrene (PS), polypropylene (PP), orientated polypropylene (OPP), biaxially orientated polypropylene (BOPP), cast polypropylene (CPP), polyamide (PA) such as nylon, polyvinyl chloride (PVC), or combinations thereof; and any thermoplastic material such as plastic; or combinations thereof.
  • the polymer and recycled polymer materials may be in the form of polymer film substrates.
  • the substrate to which the composition has been applied to or incorporated within may itself be applied to a further substrate.
  • further substrates include, but are not limited to the following: polymers and recycled polymer materials such as polyethylene terephthalate (PET), polyethylene (PE), low density polyethylene (LDPE), high density polyethylene (HDPE), polystyrene (PS), polypropylene (PP), orientated polypropylene (OPP), biaxially orientated polypropylene (BOPP), cast polypropylene (CPP), polyamide (PA) such as nylon, polyvinyl chloride (PVC), or combinations thereof; cellulose; glass; plastic; metal and metal foils; textiles; paper; corrugated paperboard, cardboard, and equivalent recycled analogues, or combinations thereof; ceramics; foodstuffs and pharmaceutical preparations; or combinations thereof, e.g. polymer lined paper.
  • the polymers and recycled polymer materials may be in the form of polymer film substrates.
  • composition according to the first aspect of the present invention, or substrate according to the second aspect of the present invention to which the composition has been applied to or incorporated within may be suitable for end use as labels (adhesive and wraparound) and/or in, for example, fast-moving consumer goods; packaging such as disposable packaging including food and hot or cold beverage containers; hygiene and personal care product packaging such as shampoo bottles; cosmetic product packaging; medical and diagnostic devices and associated packaging; and outdoor products such as signage.
  • the substrate comprises an additional adhesive layer.
  • this additional adhesive layer is operable to apply the substrate to a further substrate or any other material and is therefore on an exterior surface of the substrate.
  • the adhesive layer may cover all, substantially all, or part of the surface area of an exterior surface of the substrate.
  • the additional adhesive layer is preferably on an exterior surface of the substrate other than that to which the composition is applied.
  • the composition according to the first aspect of the present invention is applied on a substrate.
  • a method of forming a substrate comprising applying to or incorporating within the substrate the composition according to the first aspect of the present invention.
  • the composition may be applied to the substrate by any suitable method. Methods of applying the composition to a substrate will be well known to a person skilled in the art. Suitable application methods include, but are not limited to the following: flexographic printing, gravure printing, screen printing, offset printing and meyer bar coating.
  • the composition may be applied to all, substantially all or part of the surface area of an exterior surface of the substrate.
  • the composition may be applied on the substrate to any suitable coat weight dependent upon both the substrate to which the composition is applied and the application method.
  • the composition is applied to a coat weight of from 0.1 to 50 gsm (grams per square metre), more preferably from 0.1 to 25 gsm and most preferably, 0.1 to 15 gsm. This coat weight is per individual layer of the composition that is applied to the substrate.
  • the coat weight may be measured by any suitable method. Suitable measuring methods will be well known to those skilled in the art. Preferably, the coat weight is measured by weighing the same area of substrate with and without the composition applied thereto, and comparing the two weights.
  • the composition may be applied to the substrate as a single layer or as part of a multi-layer system.
  • the composition may be applied to the substrate as an undercoat or an overcoat, on top of a primer or as a primer layer.
  • the composition may be applied to the substrate once or multiple times.
  • the composition may be applied to at least part or all of an exterior surface of the substrate.
  • the composition may be applied to the substrate as a single layer or as part of a multi-layer system.
  • the composition may be applied to the substrate as an undercoat or an overcoat, on top of a primer or as a primer layer.
  • the composition may be applied to the substrate once or multiple times.
  • the composition may be applied to at least part or all of an exterior surface of the substrate.
  • the composition according to the present invention may be incorporated within the substrate by any suitable method. Methods of incorporating the composition within a substrate will be well known to a person skilled in the art. Suitable incorporation methods include, but are not limited to: extrusion methods including melt extrusion; injection molding; blow molding; compression molding; film insert molding; gas assisted molding; rotational molding; structural foam molding; thermoforming; and combinations thereof.
  • the composition may be incorporated within the substrate on its own or as part of a solid and/or liquid masterbatch.
  • the composition may be incorporated within a substrate to any suitable weight percentage of the total solid weight of the substrate.
  • the substrate comprises 0.001 to 50 % of the composition incorporated within, based on the total solid weight of the substrate. More preferably, the substrate comprises 0.002 to 30 % of the composition incorporated within, based on the total solid weight of the substrate. Most preferably, the substrate comprises 0.003 to 20 % of the composition incorporated within, based on the total solid weight of the substrate.
  • the composition according to the first aspect of the present invention is applied to the substrate.
  • the application to, or incorporation of the composition within the substrate enables an image to be formed on or within the substrate. It will be appreciated that the composition enables a single-or multi-coloured image to be formed on or within the substrate.
  • a method of forming colour on or within a substrate comprising the composition according to the first aspect of the present invention applied to or incorporated within, the method comprising applying to the composition on or within the substrate the applied transition stimulus and activation temperature and each of the additional applied stimuli or additional temperatures, as required to develop the coloured states of the activatable component and two additional components of the composition.
  • a method of forming an image on or within a substrate comprising the composition according to the first aspect of the present invention applied to or incorporated within, the method comprising applying to the composition on or within the substrate the applied transition stimulus and activation temperature and each of the additional applied stimuli or additional temperatures, as required to develop the coloured states of the activatable component and two additional components at of the composition, and thereby create an image on or within the substrate.
  • the applied transition stimulus and activation temperature and each of the additional applied stimulus or additional applied temperature may be applied to the composition such that the non- coloured state and/or coloured state of the activatable component and each of the two additional components are present at different localised positions of the composition to create an image.
  • the coloured states of the activatable component and each of the additional components may be selectively developed at localised positions.
  • Suitable means for applying the applied transition stimulus, activation temperature, and each of the additional applied stimulus or additional temperature are as discussed above. It will be further understood by a skilled person that the application of the applied transition stimulus, activation temperature and each of the additional applied stimulus or additional temperature to the composition, will be conducted in the appropriate order required to form the desired image. This can facilitate the formation of a multi-coloured image.
  • each of the additional applied stimuli or additional temperatures may be applied at the same localised position.
  • the applied transition stimulus and activation temperature, and each of the additional applied stimuli or additional temperatures may be applied to that particular localised position of the composition.
  • the relationship between the activation temperature and additional temperatures will vary dependent upon the colours required in the image that is to be formed.
  • the relationship between the wavelengths of the applied transition stimulus and additional applied stimuli will vary dependent upon the colours required in the image that is to be formed so as to facilitate formation of the desired image.
  • Conductive sources of temperature include, but are not limited to the following: sources of steam and hot air, lamps, heat tunnels, LED(s), thermal print heads, hotplates, thermal conductors, hot liquids, and heated substrates.
  • composition according to the first aspect of the present invention in the formation of colour on or within a substrate.
  • a use of the composition according to the first aspect of the present invention in the formation of an image on or within a substrate in the formation of an image on or within a substrate.
  • an activatable component capable of transitioning from a non-coloured state to a coloured state, the transition being effected by the application of an applied transition stimulus, wherein the activatable component requires activation to allow transitioning to occur, where said activation occurs by application of an activation temperature;
  • the activatable component and two additional components are as defined above throughout the first to seventh aspects of the present invention.
  • the applied transition stimulus, activation temperature, additional applied stimulus and additional temperature are as defined above throughout the first to seventh aspects of the present invention.
  • the substrate according to the eighth aspect of the present invention is based upon the substrate according to the second aspect of the present invention, the substrate according to the second aspect of the present invention having a composition layer applied to or incorporated within, and the substrate according to the eighth aspect of the present invention having a plurality of discrete layers applied thereon.
  • the two additional components must be components selected from groups (b1 ) to (b5) as defined above.
  • the two additional components independently selected from groups (b1 ) to (b5) are different.
  • the two additional components are selected either from different groups of (b1 ) to (b5) as defined below, or are selected from the same group (b1 ) to (b5), but are selected so as to be different compounds in that group, e.g. two different leuco dyes.
  • the two additional components are independently selected from different groups (b1 ) to (b5)
  • the plurality of discrete layers do not comprise a combination of an activatable component and only components of groups (b3) and (b5).
  • first discrete layer comprising the activatable component
  • second different discrete layer comprising an additional component
  • third different discrete layer (different to the first and second layers) comprising a different additional component
  • These three layers can be in any order on the substrate.
  • different additional components is meant that the two additional components are selected either from different groups of (b1 ) to (b5) as defined above, or are selected from the same group (b1 ) to (b5), but are selected so as to be different compounds in that group, e.g. two different leuco dyes.
  • the two additional components are independently selected from different groups (b1 ) to (b5).
  • the activatable component and at least one of the two additional components are present in different layers of the plurality of discrete layers, i.e. (b) there may be a first discrete layer comprising the activatable component, a second different discrete layer comprising an additional component, and a third different discrete layer (different to the first and second layers) comprising a different additional component.
  • the plurality of discrete layers comprises an activatable component, a keto acid compound and an oxyanion of a multivalent metal.
  • the three components are each in a different discrete layer.
  • the plurality of discrete layers may comprise one or more additional layers.
  • Suitable additional layers may be selected from, but not limited to: thermal insulating layers; polymer layers; radiation blocking layers such as layers comprising UV absorbing components or layers comprising UV absorbing components; primers; adhesion promoting layers; quenching layers; layers comprising hindered amine light stabilisers; overprint varnish layers; barrier layers; diffusion barrier layers; and combinations thereof.
  • the discrete layer comprising the activatable component is preferably formed of a composition applied to the substrate.
  • each of the different discrete layers comprising an additional component is preferably formed of a composition applied to the substrate.
  • the activatable component and each of the additional components may be present in those individual compositions in any suitable amount, preferably from 5 to 60% of the total solid weight of the composition, or even from 5 to 50%, or from 5 to 35% of the total solid weight of the composition, or even from 5 to 15% of the total solid weight of the composition.
  • compositions are formulated with other components such as NIR absorbers, binders, solvents and additives as defined above for the composition according to the first aspect of the present invention.
  • any acid- or base-generating agent associated with an additional component will be as defined above in relation to the first aspect of the present invention, and will be present in the same layer as the additional component to which it relates, i.e. will be present in the same composition forming the discrete layer comprising the additional component in amounts as defined above in relation to the first aspect of the present invention.
  • the plurality of discrete layers comprises one or more additional layers and these one or more additional layers are positioned between the discrete layer comprising the activatable component and each of the different discrete layers comprising an additional component
  • the one or more additional layers mean that the applied transition stimulus and activation temperature and additional applied stimulus or additional temperature can be applied to the substrate from both sides in order to form multi-coloured images, the two sides being defined by the one or more additional layers separating the layer comprising the activatable component from the layers comprising the two additional components.
  • the plurality of discrete layers may have any suitable overall coat weight.
  • the plurality of discrete layers individually have a coat weight as set out above in relation to the composition according to the first aspect of the present invention.
  • the plurality of discrete layers have an overall coat weight (encompassing all layers) of less than 100 gsm (grams per square metre), more preferably less than 50 gsm, and most preferably less than 30 gsmlt will be appreciated by a skilled person that the overall coat weight of the plurality of discrete layers will be dependent upon the layer formation and the substrate.
  • the substrate according to the eighth aspect of the present invention may be suitable for end use as labels (adhesive and wraparound) and/or, in fast-moving consumer goods; packaging such as disposable packaging including food and hot or cold beverage containers; hygiene and personal care product packaging such as shampoo bottles; cosmetic product packaging; medical and diagnostic devices and associated packaging; and outdoor products such as signage.
  • packaging such as disposable packaging including food and hot or cold beverage containers
  • hygiene and personal care product packaging such as shampoo bottles
  • cosmetic product packaging such as medical and diagnostic devices and associated packaging
  • outdoor products such as signage.
  • the plurality of discrete layers may be applied to any suitable substrate. It will be appreciated by a skilled person that the layer structure of the plurality of discrete layers may vary depending on the substrate to which it is to be applied.
  • the substrates to which the plurality of discrete layers may be applied are as described above in relation to the substrate according to the second aspect of the present invention.
  • suitable substrates to which the plurality of discrete layers may be applied to include, but are not limited to: polymers and recycled polymer materials such as polyethylene terephthalate (PET), polyethylene (PE), low density polyethylene (LDPE), high density polyethylene (HDPE), polystyrene (PS), polypropylene (PP), orientated polypropylene (OPP), biaxially orientated polypropylene (BOPP), cast polypropylene (CPP), polyamide (PA) such as nylon, polyvinyl chloride (PVC), or combinations thereof; cellulose; glass; plastic; metal and metal foils; textiles; paper; corrugated paperboard, cardboard, and equivalent recycled analogues, or combinations thereof; ceramics; foodstuffs and pharmaceutical preparations; or combinations thereof, e.g. polymer lined paper.
  • the polymers and recycled polymer materials may be in the form of polymer film substrates.
  • the substrate to which the plurality of discrete layers are applied is a polymer film substrate.
  • the substrate is colourless (i.e. transparent or translucent), off-white or white.
  • the substrate is colourless, and is a polymer film substrate.
  • the substrate to which the plurality of discrete layers has been applied to may itself be applied to a further substrate.
  • further substrates include, but are not limited to the following: polymers and recycled polymer materials such as polyethylene terephthalate (PET), polyethylene (PE), low density polyethylene (LDPE), high density polyethylene (HDPE), polystyrene (PS), polypropylene (PP), orientated polypropylene (OPP), biaxially orientated polypropylene (BOPP), cast polypropylene (CPP), polyamide (PA) such as nylon, polyvinyl chloride (PVC), or combinations thereof; cellulose; glass; plastic; metal and metal foils; textiles; paper; corrugated paperboard, cardboard, and equivalent recycled analogues, or combinations thereof; ceramics; foodstuffs and pharmaceutical preparations; or combinations thereof, e.g.
  • PET polyethylene terephthalate
  • PE polyethylene
  • LDPE low density polyethylene
  • HDPE high density polyethylene
  • PS polystyrene
  • the substrate to which the plurality of discrete layers are applied comprises an additional adhesive layer.
  • this additional adhesive layer is operable to apply the substrate to a further substrate or any other material and is therefore on an exterior surface of the substrate.
  • the adhesive layer may cover all, substantially all, or part of the surface area of an exterior surface of the substrate.
  • a ninth aspect of the present invention there is provided a method of forming a substrate according to the eighth aspect of the present invention, the method comprising applying to a substrate the plurality of discrete layers.
  • the method of forming the substrate according to the ninth aspect of the present invention is as defined above for the third aspect of the present invention.
  • the plurality of discrete layers may be applied to the substrate by any suitable method. Methods of applying the plurality of discrete layers to a substrate will be well known to a person skilled in the art. Suitable application methods include, but are not limited to the following: flexographic printing, gravure printing, screen printing, offset printing and meyer bar coating.
  • the plurality of discrete layers may be applied to all, substantially all or part of the surface area of the substrate.
  • the plurality of discrete layers is applied to the substrate layer by layer in the required order. The application of the plurality of discrete layers to the substrate enables an image to be formed on the substrate.
  • a method of forming colour on a substrate comprising applying to the substrate, the applied transition stimulus and activation temperature and each of the additional applied stimuli or additional temperatures, as required to develop the coloured states of the activatable component and two additional components.
  • a method of forming an image on a substrate comprising applying to the substrate, the applied transition stimulus and activation temperature and each of the additional applied stimuli or additional temperatures, as required to develop the coloured states of the activatable component and two additional components, and thereby forming an image on the substrate.
  • the application of the applied transition stimulus and activation temperature and each of the additional applied stimuli or additional temperatures to the substrate may be such that the non-coloured states and/or coloured states of the activatable component and two additional components are formed at different localised positions to create an image. Their application will be conducted in the appropriate order required to selectively form the non-coloured and/or coloured states of the activatable component and two additional components at localised positions. The coloured states of the activatable component and the two additional components may be selectively developed at localised positions. Multi-coloured images can be formed. Suitable means for applying the applied transition stimulus, activation temperature and each of the additional applied stimuli or additional temperatures are as defined above.
  • more than one of the applied transition stimulus, activation temperature and each of the additional applied stimuli or additional temperatures may be applied at the same localised position.
  • activation temperature and at least one of the additional applied stimuli or additional temperatures will be applied to that particular localised position.
  • the relationship between the activation temperature and the additional temperatures will vary dependent upon the colours required in the image that is to be formed.
  • the relationship between the wavelengths of the applied transition stimulus and the additional applied stimuli will vary dependent upon the colours required in the image that is to be formed so as to facilitate the formation of the desired image.
  • a separate conductive source of temperature may be provided to the composition before, during or after the formation of the image.
  • Conductive sources include, but are not limited to the following: sources of steam and hot air, lamps, heat tunnels, LED(s), thermal print heads, hotplates, thermal conductors, hot liquids and heated substrates.
  • the radiation applied to the compositions or substrates disclosed herein is applied using an apparatus suitable for such purpose, i.e. suitable for calculating the radiation required relating to the different stimuli and temperatures required to produce a desired image and applying it to the composition or substrate.
  • the apparatus will be programmed to effect the application of the different stimuli and temperatures to the compositions or substrates in the required order and facilitate the formation of an image.
  • C M S alkyl demotes a straight or branched saturated alkyl group having from 1 to 18 carbon atoms; optionally "C M S alkyl” groups can contain some degree of unsaturation (partial unsaturation) i.e. may contain one or more alkene/alkenyl moiety(s). For parts of the range C M S alkyl, all sub-groups thereof are contemplated, such as C M O alkyl, C 5-i 5 alkyl, C 5-i 0 alkyl, and Ci -6 alkyl.
  • Ci -4 alkyl groups examples include methyl, ethyl, n-propyl, iso- propyl, n-butyl, iso-butyl, sec-butyl, and tert-butyl.
  • the alkyl groups may be optionally substituted with one or more functional groups, including C M S alkyl groups, "C 6- 12 aryl", and "C M S alkoxy", halogen, and "C 3-i8 cycloalkyl".
  • C 6- 12 aryl denotes a monocyclic or polycyclic conjugated unsaturated ring system having from 6 to 12 carbon atoms.
  • C 6-i o aryl C 6-i o aryl
  • Ci 0- 12 aryl C 6 -s aryl
  • An aryl group includes condensed ring groups such as monocyclic ring groups, or bicyclic ring groups. Examples of C 6- 12 aryl groups include phenyl, biphenyl, indenyl, naphthyl or azulenyl.
  • Condensed rings such as indan and tetrahydro naphthalene are also included in the C 6- 12 aryl group.
  • the aryl groups may be optionally substituted with other functional groups.
  • the aryl groups may be optionally substituted with one or more functional groups, including C M S alkyl groups, halogen, and "C M S alkoxy".
  • the aryl groups may be substituted with these substituents at a single position on their unsaturated ring system, or may be substituted with these substituents at multiple positions on their unsaturated ring system.
  • C M S alkoxy denotes a straight of branched C M S alkyl group which is attached to the remainder of the molecule through an oxygen atom.
  • C M O alkoxy C 5-i 5 alkoxy, C 5-i0 alkoxy, and Ci -6 alkoxy.
  • Ci -4 alkoxy groups include methoxy, ethoxy, n-propoxy, iso-propoxy, n-butoxy, iso-butoxy, sec-butoxy, and tert-butoxy.
  • the alkoxy groups may be optionally substituted with other functional groups.
  • the alkoxy groups may be optionally substituted with one or more functional groups, including C M S alkyl groups, "C 6- 12 aryl", and "Ci-is alkoxy", halogen, and "C 3-i8 cycloalkyl”.
  • C 3-i8 cycloalkyl denotes a non-aromatic, saturated or partially saturated (i.e. may contain one or more alkene or alkenyl moiety(s)) monocyclic ring system having from 3 to 18 carbon atoms.
  • C 3-i 8 cycloalkyl all sub-groups thereof are contemplated, such as C 3-8 cycloalkyl, C 5-i 5 cycloalkyl, and C 5-i0 cycloalkyl.
  • suitable C 3-i0 cycloalkyls include cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl and cycloheptyl.
  • the cycloalkyl groups may be optionally substituted with other functional groups.
  • the cycloalkyl groups may be optionally substituted with one or more functional groups, including Ci -20 alkyl groups, "C 5-2 o aryl", “Ci -20 alkoxy”, “hydroxylCi -2 o alkoxy” and "C 3-i 8 cycloalkyl”.
  • the term “fully saturated” refers to rings where there are no multiple bonds between ring atoms.
  • Halogen refers to fluorine, chlorine, bromine or iodine.
  • heterocycle and “heterocyclic ring” denotes a non-aromatic, saturated or partially saturated monocyclic or polycylic ring system having from 4 to 18 ring atoms in which one or more of the ring atoms is not carbon, e.g. nitrogen, sulphur or oxygen.
  • the said ring system may be attached to the rest of the molecule through either a heteroatom or a carbon atom of the ring system.
  • heterocyclic groups include but are not limited to: piperidinyl, morpholinyl, homomorpholinyl, azepanyl, piperazinyl, oxo-piperazinyl, diazepinyl, tetrahydropyridinyl, tetrahydropyranyl, pyrrolidinyl, tetrahydrofuranyl and dihydropyrrolyl.
  • heteroaryl and “heteroaromatic ring” denote a monocyclic or polycyclic hetero-aromatic group comprising 5 to 18 atoms in which one or more of the atoms are other than carbon, such as nitrogen, phosphorus, sulphur or oxygen.
  • the said hetero-aromatic ring may be attached to the rest of the molecule through either a heteroatom or a carbon atom of the ring system.
  • heteroaryl groups include but are not limited to furyl, pyrrolyl, thienyl, oxazolyl, isoxazolyl, oxadiazolyl, imidazolyl, oxatriazoly, thiazolyl, isothiazolyl, tetrazolyl, pyrazolyl, pyridinyl, pyrimidinyl, pyridazinyl, pyrazinyl, triazinyl and thiadiazolyl.
  • the heteroaryl group contains at least one ring nitrogen atom.
  • the nitrogen atoms in the heteroaryl groups can be basic, as in the case of an imidazole or pyridine, or essentially non-basic as in the case of an indole or pyrrole nitrogen.
  • the number of basic nitrogen atoms present in the heteroaryl group, including any amino group substituents of the ring, will be less than five.
  • cyclic amino group refers to a non-aromatic, fully saturated or partially unsaturated monocyclic ring system having from 4 to 18 ring atoms in which one of the ring atoms is nitrogen and the group is attached to the rest of the molecule via this nitrogen atom.
  • one or more of the remaining ring atoms may be other than carbon, such as nitrogen, sulphur or oxygen.
  • Examples of such cyclic amino groups include piperidine (1-piperidinyl), pyrrolidine (1- pyrrolidinyl), pyrrolidone, morpholine or piperazine.
  • secondary amino group is meant an amine group formed by replacement of two of the hydrogen atoms in ammonia by groups or atoms other than the hydrogen atoms, the group being attached to the rest of the molecule by the bond other than the two joining the two groups or atoms replacing the hydrogen atoms to the nitrogen atom.
  • Step 1 Synthesis of a pyrazaole ring
  • a hydrazine and an ethyl-3-oxo-3-propanoate are refluxed together releasing ethanol and water, and forming a pyrazalone ring product having substituents A and B on the ring.
  • the product is purified by precipitation or recrystallization from an appropriate solvent.
  • Step 2 Addition of a reactive ketone substituent
  • the pyrazalone ring product from step 1 is reacted with an acyl chloride in the presence of calcium hydroxide under reflux.
  • the reactive ketone product is purified by either precipitation or recrystallization from an appropriate solvent.
  • Step One Synthesis of 1 ,3-diphenyl-5-pyrazalone (DPP) 1.
  • DPP 1,3-diphenyl-5-pyrazalone
  • Phenylhydrazine (56 g, 0.51 mmol, yellow liquid) is added to the round bottom flask and the mixture is stirred resulting in a pale-yellow solution. 50 ml of additional toluene is used to rinse any excess phenylhydrazine into the reaction.
  • a dean stark trap is fitted to the flask with a reflux condenser attached.
  • a heating block is used to heat the reaction solution to 110 °C. 6.
  • the dean stark apparatus is used to remove water/ethanol and assess when the reaction has gone to completion (TLC may also be used to assess progress of reaction eluting with DCM/Heptane 4:1 ).
  • reaction mixture is allowed to cool with stirring to avoid the formation of large clumps of product. 8. Once the reaction mixture is cool enough to handle, it is poured into a large beaker and any large product clumps are broken up with a spatula.
  • Heptane (-100 ml_) is added to the beaker and a large spatula is used to break up all the clumps rending the material into a relatively free flowing crystalline powder. 10. An additional 1.4 L of heptane is added and the product slurried overnight. 1 1. The pale-yellow solids are vacuum filtered and dried under vacuum (108.4 g, 88 %).
  • Step Two Synthesis of (5-hvdroxy-1 ,3-diphenyl-1 H-pyrazol-4-yl)(4-
  • DPP (25.75 g, 109.0 mmol) is weighed and placed in a 3-neck round bottom flask (rbf) fitted with a stirrer, thermometer and dropping funnel.
  • reaction solution is allowed to cool back to 50 °C.
  • the brown solids are transferred to a large beaker and slurried in hot I PA for around 3 hours, the solvent is allowed to cool while still slurrying. 15. The yellow solids are then vacuum filtered on paper and dried by suction for around 1 hour.
  • the yellow solids are transferred to a drying dish and dried in a vacuum oven (30 °C) over night (36.60 g, 82.24 %).
  • Step Three Synthesis of (E)-2-((5-hvdroxy-1 ,3-diphenyl-1 H-pyrazol-4-yl)(4- (trifluoromethyl)phenyl)methylene-N-phenylhydrazine-1 -carboxamide
  • CF 3 -Bn-DPP (20.08 g, 49.17 mmol) is weighed and placed into a 3-neck round bottom flask (rbf) fitted with a stirrer bar, thermometer and condenser.
  • Glacial acetic acid (0.1 M in ethanol, 5 ml_, 0.49 mmol) is added to the
  • reaction mixture is heated to reflux (80 °C) and followed by TLC (DCM 40% ethylacetate). 6. The reaction kis refluxed for 6 hours and then left to cool and stand over the weekend.
  • the hydrazine hydrate solution is added with stirring over the course of 5 to 20 minutes to the solution of the 2-hydroxyarylcarbonyl. This addition may result in a small exotherm.
  • any precipitate which is formed is vacuum filtered on paper and washed with additional ethanol and optionally, additional water, to ensure the complete removal of any remaining hydrazine hydrate.
  • the collected solids may be vacuum filtered on paper and dried in a vacuum oven overnight; or the collected solids may be dissolved with heating in solvent and then precipitated by addition of further solvent, and the resulting solids vacuum filtered on paper and dried in a vacuum oven overnight; or the collected solids may be recrystallised from hot ethanol, and vacuum filtered on sintered glass and left to air dry. It will be appreciated that the selection of the methodology in step 7 will be dependent upon the properties of the specific solids formed.
  • keto acid compounds of formula (V) can be purchased from Chameleon Speciality Chemicals Ltd, or formulated according to the following syntheses.
  • the solids were dissolved in dichloromethane (300 ml_) and passed through a silica pad eluting with dichloromethane until the filtrate ran clear.
  • the dichloromethane solution was concentrated on a roto-evaporator to ⁇ 0.5 L and was precipitated by adding the dichloromethane solution to a beaker of stirred Heptane (1 L).
  • the precipitate was vacuum filtered onto paper, dried by suction for around 10 minutes then transferred to a drying dish and dried in a vacuum oven (20 °C) overnight yielding the product as a beige coloured powder (22.23 g, 77.92 mmol, 41.1 %).
  • the column fractions were concentrated on a roto-evaporator to -0.5 L and was precipitated by adding the solution to a beaker of stirred heptane (1 L). The precipitate was vacuum filtered onto paper, dried by suction for around 10 minutes then transferred to a drying dish and dried in a vacuum oven (20 °C) overnight yielding the product as a pale-yellow coloured powder (7.60 g, 21.2 mmol, 16.3 %).
  • the column fractions were concentrated on a roto-evaporator to -0.5 L and was precipitated by adding the solution to a beaker of stirred heptane (1 L).
  • the Precipitate was vacuum filtered onto paper, dried by suction for around 10 minutes then transferred to a drying dish and dried in a vacuum oven (20 °C) overnight yielding the product as a yellow coloured powder (15.63 g, 34.65 mmol, 26.02 %).
  • the column fractions were concentrated on a roto-evaporator to ⁇ 0.5 L and was precipitated by adding the solution to a beaker of stirred heptane (2 L). The precipitate was vacuum filtered onto paper, dried by suction for around 10 minutes then transferred to a drying dish and dried in a vacuum oven (20 °C) overnight yielding the product as a yellow coloured powder (5.84 g, 10.6 mmol, 9.29 %).
  • the natural state (non- coloured state) of the activatable component or and two additional components is either off-white or white.
  • the 10.6 pm C0 2 laser is set at a speed of 2600 - 5350 /s and at 38% power.
  • the speed or power can be varied to alter the fluence applied by the laser source. Marking speeds within the 2600-5350 mm/s range are 2600, 2975, 3325, 3600, 3850, 4100, 4300, 4750,
  • a composition comprising an oxyanion of a multivalent metal is formulated according to Table 1. All amounts are provided in weight percentage (wt%).
  • a composition comprising an a diacetylene compound (an activatable component) is formulated according to Table 4, using the millbase formulations in Tables 2 and 3. All amounts are provided in weight percentage (wt%).
  • composition comprising a pyrazole (thio)semicarbazone compound of formula (III) (an additional component) was formulated according to Table 5.
  • a layer of the composition comprising an oxyanion of a multivalent metal is applied to a paper substrate using a k2 k-bar applicator.
  • a layer of the composition comprising a diacetylene compound is applied using a k2 k-bar applicator over the layer of the composition comprising an oxyanion of a multivalent metal.
  • a layer of the composition comprising a pyrazole (thio) semicarbazone compound of formula (III) is then applied using a k2 k-bar applicator over the layer of the composition comprising a diacetylene compound.
  • the pyrazole (thio)semicarbazone compound of formula (III) the diacetylene compound and the oxyanion of a multivalent metal are in the non-coloured state.
  • the pyrazole (thio)semicarbazone compound of formula (III) transitions from the non-coloured to a pale yellow coloured state, such that a pale yellow colour is displayed on the substrate.
  • An additional temperature is applied using a 10.6 pm C0 2 laser (38% power) to provide NIR radiation to localised positions of the substrate either prior to or subsequent to the application of the UV radiation. At these localised positions, the oxyanion of a multivalent metal transitions from its non-coloured to a black coloured state.
  • the intensity of the colour formed can be varied by variation of the fluence provided by the C0 2 laser.
  • the additional temperature required to facilitate the transition of the oxyanion of a multivalent metal from the non-coloured to a coloured state is higher than the activation temperature of the diacetylene compound. Accordingly, upon application of the additional temperature required to facilitate the transition of the oxyanion of a multivalent metal from the non-coloured to a coloured state, the activation temperature is reached and the non-coloured state of the diacetylene compound is also‘activated’ at these localised positions. Upon further application of UV radiation (applied transition stimulus) via flood illumination using a germicidal lamp, the diacetylene compound transitions from the activated non-coloured state to a blue coloured state at these localised positions.
  • the final colour displayed at these localised positions is dependent upon the colour of the blue coloured state of the diacetylene compound, and the black coloured state of the oxyanion of a multivalent metal, i.e. the final colour at these localised positions results from the combination of colours of the coloured states of the two components. Accordingly, different blue and black colours can be formed. It is noted that, when formed, the colour of the coloured state of the pyrazole (thio)semicarbazone compound of formula (III) also contributes to the final colour displayed at the localised positions.
  • a multi-coloured image may therefore be formed displaying yellow, blue and black colours.
  • a composition comprising a keto acid compound of formula (V) (an additional component) was formulated according to Table 6. All amounts are provided in weight percentage (wt%).
  • a composition comprising an oxyanion of a multivalent metal was formulated according to Table 1 above.
  • a composition comprising a diacetylene compound was formulated according to Table 4 above, using the millbase formulations or Tables 2 and 3 the diacetylene compound being replaced by N1 ,N22- didecyldocosa-10, 12-diynediamide.
  • a layer of the composition comprising an oxyanion of a multivalent metal was applied to a paper substrate using a K2 K-bar applicator.
  • a layer of the composition comprising a keto acid compound of formula (V) was then applied using a k2 k-bar applicator over the layer of the composition comprising an oxyanion of a multivalent metal.
  • a layer of the composition comprising a diacetylene compound was then using a k2 k-bar applicator over the layer of the composition comprising a keto acid compound of formula (V).
  • an additional temperature is applied to localised positions by IR radiation using a 10.6 pm C0 2 laser (20% power).
  • the keto acid compound of formula (V) transitions from the non- coloured state to a yellow coloured state at the localised positions.
  • the intensity of the yellow colour can be varied by alteration of the fluence provided by the C0 2 laser. It is noted that the additional temperature required to facilitate a transition of the keto acid compound of formula (V) from the non-coloured state to a coloured state is slightly lower than the additional temperature required to facilitate a transition of the oxyanion of a multivalent metal from a non-coloured to a coloured state.
  • the power of the C0 2 laser is increased to 38%. This facilitates the formation of the black coloured state of the oxyanion of a multivalent metal.
  • the intensity of the black colour formed can be made to vary by variation of the fluence provided by the C0 2 laser.
  • the final colour displayed at these localised positions is dependent upon the black colour of the coloured state of the oxyanion of a multivalent metal, and the yellow colour of the coloured state of the keto acid compound of formula (V), i.e. the final colour at these localised positions results from the combination of colours of the coloured states of the two components. Accordingly, different yellow and black coloured states can be formed.
  • the activation temperature of the diacetylene compound is lower than both the additional temperatures. Accordingly, upon application of the IR radiation at the localised positions of the substrate, the non-coloured state of the diacetylene compound is activated at these localised positions.
  • the diacetylene compound transitions from the non-coloured state to a first blue coloured state at the localised positions at which the non-coloured state has been‘activated’. If the UV radiation has been applied following only the application of IR radiation using the C0 2 laser at 20% power, the colour displayed at the localised positions will be a combination of the blue of the first coloured state of the diacetylene compound and the yellow coloured state of the keto acid compound of formula (V). Accordingly, different blue and green colours can be formed.
  • the diacetylene compound transitions from the blue first coloured state to a red second coloured state.
  • the intensity of the colour can be varied by variation of the fluence applied by the C0 2 laser.
  • the colour displayed at the localised positions will be a combination of the red of the second coloured state of the diacetylene compound and the yellow coloured state of the keto acid compound of formula (V). Accordingly, different orange and red colours can be formed.
  • the applied temperature is lower than the additional temperature required to facilitate a transition of the oxyanion of a multivalent metal from the non-coloured to the coloured state.
  • the additional temperature is reached and the oxyanion of a multivalent metal transitions from the non-coloured to a black coloured state.
  • the intensity of the colour can be varied by variation of the fluence applied by the C0 2 laser.
  • the colour displayed at the localised positions will be a combination of the red of the second coloured state of the diacetylene compound, the yellow coloured state of the keto acid compound of formula (V), and the black coloured state of the oxyanion of a multivalent metal. Accordingly, different red, brown and black colours can be formed.
  • the colour displayed at the localised positions will be a combination of the blue of the first coloured state of the diacetylene compound, the yellow coloured state of the keto acid compound of formula (V), and the black coloured state of the oxyanion of a multivalent metal. Accordingly, different green and black colours can be formed.
  • a multi-coloured image displaying yellow, black, green, blue, red, orange and brown colours can therefore be formed.
  • composition comprising a leuco dye (an additional component) was formulated according to Table 7. All amounts are provided in weight percentage (wt%). Table 7
  • a composition comprising a pyrazole (thio)semicarbazone compound of formula (III) was formulated according to Table 5, the pyrazole (thio)semicarbazone compound of formula (III) being replaced by (E)-2-((5-hydroxy-1 ,3-diphenyl-1 H- pyrazol-4-yl)(phenyl)methylene)-N-phenylhydrazine-1 -carboxamide.
  • a composition comprising a diacetylene compound (an activatable component) was formulated according to Table 4, using the millbase formulations of Tables 2 and 3 the diacetylene compound being replaced by N1 ,N22-didecyldocosa-10,12- diynediamide.
  • a layer of the composition comprising a leuco dye was applied to a paper substrate using a k2 k-bar applicator.
  • a layer of the composition comprising a pyrazole (thio)semicarbazone compound of formula (III) was applied using a k2 k-bar applicator over the layer of the composition comprising the leuco dye.
  • a layer of the composition comprising a diacetylene compound was then applied over the layer of the layer of the composition comprising a pyrazole (thio)semicarbazone compound of formula (III).
  • the leuco dye, pyrazole (thio)semicarbazone compound of formula (III) and diacetylene compound are in their non-coloured states.
  • IR radiation is applied to localised positions of the substrate using a 10.6 pm C0 2 laser (20% or 38% power) (additional temperature).
  • the leuco dye transitions from the non- coloured to a pale blue coloured state.
  • the intensity of the blue colour of the coloured state can be varied by alteration of the fluence applied by the C0 2 laser, e.g. by altering the power of the laser.
  • the activation temperature for the diacetylene compound is lower than the additional temperature required to facilitate a transition of the leuco dye from the non- coloured to a coloured state. Accordingly, at the localised positions to which the IR radiation is applied, the non-coloured state of the diacetylene compound is ‘activated’.
  • the ‘activated’ non-coloured state of the diacetylene compound transitions to a blue first coloured state at the localised positions.
  • the pyrazole (thio)semicarbazone of formula (III) also transitions from the non- coloured to a yellow coloured state across the substrate, the UV radiation acting as the additional applied stimulus.
  • a yellow colour is therefore formed across the substrate apart form at the localised positions at which the first coloured state of the diacetylene compound and the coloured state of the leuco dye have also been formed.
  • the colour displayed is a combination of the colour of blue first coloured state of the diacetylene compound, the pale blue coloured state of the leuco dye and the yellow coloured state of the pyrzole (thio)semicarbazone compound of formula (III). Accordingly, a very intense blue colour may be formed.
  • the blue first coloured state transitions to a red second coloured state.
  • the colour displayed is a combination of the colour of red second coloured state of the diacetylene compound, the pale blue coloured state of the leuco dye and the yellow coloured state of the pyrzole (thio)semicarbazone compound of formula (III). Accordingly, different red and orange colours may be formed.
  • a multi-coloured image displaying blue, red and yellow colours can therefore be formed.

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Abstract

La présente invention concerne une composition servant à former une image sur un substrat ou à l'intérieur d'un substrat, la composition comprenant : (a) un composant activable capable de passer d'un état non coloré à un état coloré, la transition étant effectuée par l'application d'un stimulus de transition appliqué, le composant activable nécessitant une activation pour que la transition ait lieu, ladite activation se produisant par l'application d'une température d'activation ; et (b) deux composants supplémentaires étant chacun capable de passer d'un état non coloré à un état coloré, la transition étant effectuée par l'application d'un stimulus appliqué supplémentaire ou d'une température supplémentaire. S'ils sont formés, les états colorés du composant activable et chacun des deux composants supplémentaires sont de couleurs différentes.
PCT/GB2019/052716 2018-09-28 2019-09-26 Compositions de formation de couleur Ceased WO2020065321A1 (fr)

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GBGB1904755.4A GB201904755D0 (en) 2019-04-04 2019-04-04 A method of forming a stable non-cloured or cloured state of a diacetylene compound
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