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WO2005049745A1 - Composition d'impression - Google Patents

Composition d'impression Download PDF

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Publication number
WO2005049745A1
WO2005049745A1 PCT/GB2004/004805 GB2004004805W WO2005049745A1 WO 2005049745 A1 WO2005049745 A1 WO 2005049745A1 GB 2004004805 W GB2004004805 W GB 2004004805W WO 2005049745 A1 WO2005049745 A1 WO 2005049745A1
Authority
WO
WIPO (PCT)
Prior art keywords
composition
pigment
binder
range
pigment particles
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/GB2004/004805
Other languages
English (en)
Inventor
Margaret Henderson
Geoffrey Ormerod
Michael Yates
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.)
Wolstenholme International Ltd
Original Assignee
Wolstenholme International 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
Application filed by Wolstenholme International Ltd filed Critical Wolstenholme International Ltd
Publication of WO2005049745A1 publication Critical patent/WO2005049745A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D11/00—Inks
    • C09D11/02—Printing inks
    • C09D11/03—Printing inks characterised by features other than the chemical nature of the binder
    • C09D11/037—Printing inks characterised by features other than the chemical nature of the binder characterised by the pigment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/328—Diffraction gratings; Holograms
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • C09D5/38—Paints containing free metal not provided for above in groups C09D5/00 - C09D5/36
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/02—Details of features involved during the holographic process; Replication of holograms without interference recording
    • G03H1/0236—Form or shape of the hologram when not registered to the substrate, e.g. trimming the hologram to alphanumerical shape
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/02—Details of features involved during the holographic process; Replication of holograms without interference recording
    • G03H1/0252—Laminate comprising a hologram layer
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/02—Details of features involved during the holographic process; Replication of holograms without interference recording
    • G03H1/024—Hologram nature or properties
    • G03H1/0244—Surface relief holograms
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H2250/00—Laminate comprising a hologram layer
    • G03H2250/36—Conform enhancement layer
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H2270/00—Substrate bearing the hologram
    • G03H2270/30—Nature
    • G03H2270/32—Transparent

Definitions

  • the present invention relates to metal-based coating compositions.
  • the present invention relates to such compositions for use in the coating of diffraction gratings in the production of holograms, such as holographic images and Diffractive Optically Variable Devices (DOVIDs)
  • holograms such as holographic images and Diffractive Optically Variable Devices (DOVIDs)
  • DOVIDs Diffractive Optically Variable Devices
  • Holograms are widely used for security authentication purposes, on items such as credit cards, currency, passports, vouchers, tickets and tamper-proof labels.
  • Holograms are also used on packaging and gift wrap, for brand protection, decorative purposes and for consumer appeal. They are characterised by their ability to diffract incident light, rather than simply reflecting or absorbing light. A number of hologram image styles are possible.
  • a uniform repeating pattern (URP) of a diffraction grating is sometimes referred to as wallpaper. This gives a rainbow effect when incident light is diffracted.
  • Dot matrix designs comprise many microscopic dots, each of them a separate diffraction grating.
  • More complex holograms have three dimensional images, giving the impression of depth on a two dimensional surface. Stereograms are also possible, where two or more images are superimposed, giving the impression of movement as the image is viewed from different angles. All of the above types of holograms require a microscopic diffraction grating pattern to be embossed onto a surface.
  • the diffraction grating diffracts the light which is incident upon it, producing a rainbow effect or an image from the incident white light.
  • An original holographic image consists of a series of microscopic patterns, most commonly recorded on photosensitive material. From this original, a less fragile metal master copy is made, which has the recorded microstructure in surface relief. The master copy is used to make replicas, typically from nickel, followed by production copies, which can be used to emboss the design into a soft transparent surface, as a series of microscopic grooves.
  • the most cost effective and common method of mass producing holograms involves the continuous embossing of the impression of the hologram into a substrate material, such as those described in US 4,913,858.
  • the diffraction grating is embossed into a thin layer of plastics, or a layer of resin coated onto a substrate.
  • the plastics or resin may be either a thermosoftening material or a material that can be UV cured to harden it. While the former is more common, the latter tends to give a more durable and sharper emboss, which gives a brighter, clearer holographic effect.
  • the embossed plastic or resin subsequently needs to be coated in order to make the hologram clearly visible. Because plastics and resins have a low refractive index, they largely transmit the light that is incident upon them and reflect very little: typically only about 4% of the incident light. Hence the embossed hologram is very weak in intensity when viewed.
  • a layer of reflective material This can be either a metallic layer, which reflects 100% of the light incident upon it, or it can be a high refractive index (HRI) material, which reflects a lot of the incident light and transmits the rest.
  • HRI refractive index
  • Zinc sulphide is the most commonly used example of a HRI material.
  • This process of embossing the plastic or resin before application of the reflection enhancement layer is known as "soft embossing”.
  • hard embossing which creates the design by embossing into the substrate through the reflection enhancement layer.
  • the substrate is usually a metallised plastics film or metallised paper, such as that described in JP 62/282078 A2.
  • Metallising the surface, to make a hologram visible, is usually done by vacuum metallisation, which involves evaporating molten metal under vacuum and depositing it onto a moving web of the desired substrate.
  • vacuum metallisation which involves evaporating molten metal under vacuum and depositing it onto a moving web of the desired substrate.
  • metallisation is a fast process, the capital cost of the equipment is very high, resulting in limited availability.
  • the hologram usually has to be transported to the vacuum metallisation equipment, so it is a separate process from the embossing step. It is desirable to be able to deposit the metal layer without using vacuum equipment.
  • Another limitation is that the metal has to be deposited as a continuous film or in stripes; it is difficult to deposit the metal in a pattern.
  • hologram that does not cover the whole of the security document , packaging material or other product upon which holograms can be deposited.
  • the hologram must be at least partly transparent, so it cannot be coated with a thick opaque layer of metal.
  • white light reflection requires the hologram to be illuminated from the same side as the viewer.
  • the hologram must be viewed from the same side as the incident light. Therefore, the hologram is viewed via white light reflection, with the viewer on the same side as the light source. In order to achieve this, one must also deposit a reflection enhancement layer.
  • the reflection enhancement layer can be made of metal.
  • the hologram is metallised underneath the embossed layer, so that light passing through the hologram is reflected back to the viewer.
  • the metallised layer has to be on the upper, viewed surface; hence holograms on these substrates are produced by hard embossing through a metallised layer deposited on the upper surface of the substrate.
  • a transparent or semi-transparent hologram so that the substrate is visible through the hologram.
  • One way of doing this is to metallise the embossed resin with a very thin layer of metal.
  • the use of a thin layer of metal such as Cr, Te or Cu is proposed in US 4,856,857.
  • a transparent hologram that is coated with metal rather than a HRI material.
  • Many applications require selective metallisation, for a holographic design that does not cover the whole of a substrate, but only selected areas. Either the whole, or part, of the substrate can be embossed. Only certain areas need to be metallised, so that only these areas will be visible as holograms. To date, the usual way of achieving this has been to metallise the whole of the embossed substrate by vacuum metallisation and then to etch away selected parts of the metal coating. Since aluminium is the most common material for metallisation, the de-metallisation step can be done using acid or alkali (such as sodium hydroxide), see for example US 2003/0223616 Al.
  • acid or alkali such as sodium hydroxide
  • WO 93/23251 proposes an alternative to vacuum metallisation for selectively metallising a holographic image.
  • the reflection enhancement layer is laid down on the embossed surface by printing a metallic coating, based on flake metallic pigment, from a standard printing press.
  • the major disadvantage of this process is that the hologram can only be viewed from the non-metallised side of the embossed design.
  • the metallic coating forms a thick layer which, when used underneath the embossed layer, allows the hologram to be viewed in white light reflection mode. When viewed with the metallised layer above the embossed layer, the hologram is not visible.
  • WO 98/18635 A discloses a method of hard embossing, where a shim is impressed onto a substrate coated with metallic particles suspended in a binder. Optimum reflectivity is said to be achieved with small, flat particles, such as aluminium flakes.
  • WO 02/04234 Al criticises the above patent, saying it is unworkable. Instead, WO 02/04234 Al uses non- platelike deformable particles, such as spherical tin particles, in a coating on a surface which is subsequently hard embossed. Neither of these patents allows the hologram to be viewed from both sides.
  • a coating composition for use in coating a diffraction grating comprising metal pigment particles and a binder wherein the ratio of pigment to binder is sufficiently high as to permit the alignment of the pigment particles to the contours of the diffraction grating.
  • the composition of the present invention provides for the coating of a diffraction grating using a printing press which is faster and cheaper than conventional methods for depositing a metallised effect on a diffraction grating.
  • the ratio of pigment particles to binder when using a translucent or transparent substrate, the image or pattern formed by the diffraction grating may be viewed from both sides of the substrate.
  • a hologram can be metallised in such a way that the holographic effect is visible from both sides, if it is printed with a metallic ink containing extremely thin metal flakes.
  • a coating composition according to the present invention can also be printed on the surface of the hologram.
  • the metallic flakes of the present invention are substantially thin enough such that they can align with the contours of the embossed pattern and allow the pattern to be visible by making it reflective. In contrast thick metallic flakes will not do this, for example ball milled aluminium flakes and thicker vacuum metallised aluminium flakes.
  • the composition of the present invention also provides for the coating of a diffraction grating using compositions of the present invention, where the composition is applied by a printing press.
  • Application of the composition by printing press is faster and cheaper than conventional methods for depositing a metallised effect on a diffraction grating.
  • the image and/or pattern formed by the diffraction grating may be viewed from both sides of the substrate.
  • the metallic pigment particles used in this invention may be prepared by vacuum deposition, such as the method described in US 4,321,087.
  • the coating composition comprises metallic pigment particles, a solvent and a resin.
  • the metallic pigment particles may be metals, such as, for example, aluminium, gold, silver, platinum, copper or any other metal which may be deposited under vacuum.
  • the particles may be an alloy, such as stainless steel, nichrome, brass, or any other alloy that may be deposited under vacuum.
  • the metallic pigment particles comprise aluminium.
  • the binder may comprise any one or more selected from the group comprising nitrocellulose, ethyl cellulose, cellulose acetate, cellulose acetate propionate (CAP), cellulose acetate butyrate (CAB), alcohol soluble propionate (ASP), vinyl chloride, vinyl acetate copolymers, vinyl acetate, vinyl, acrylic, polyurethane, polyamide, rosin ester, hydrocarbon, aldehyde, ketone, urethane, polythyleneterephthalate, terpene phenol, polyolefin, silicone, cellulose, polyamide and rosin ester resins.
  • the binder comprises 50% nitrocellulose 50% polyurethane.
  • the composition may additionally comprise a solvent.
  • the solvent may be ester/alcohol blends and preferably normal propyl acetate and ethanol. More preferably, the ester/alcohol blend is in a ratio of between 10:1 and 40:1, even more preferably 20: 1 to 30: 1.
  • the solvent used in the metallic ink may comprise any one or more of an ester, such as n-propyl acetate, iso-propyl acetate, ethyl acetate, butyl acetate; an alcohol, such as ethyl alcohol, industrial methylated spirits, isopropyl alcohol or normal propyl alcohol; a ketone, such as methyl ethyl ketone or acetone; an aromatic hydrocarbon, such as toluene; or water.
  • an ester such as n-propyl acetate, iso-propyl acetate, ethyl acetate, butyl acetate
  • an alcohol such as ethyl alcohol, industrial methylated spirits, is
  • the average particle diameter may be in the range of 2 to 20 ⁇ m.
  • the average particle diameter is preferably in the range of 5 to 20 ⁇ m, more preferably 8 to 15 ⁇ m, even more preferably 9 to lO ⁇ m in diameter as measured by a laser diffraction instrument (Coulter LSI 30).
  • the composition is used in the manufacture of a hologram.
  • the metallic pigment particles are printed in such a way as to align themselves such that they follow and conform to the contours of the diffraction grating.
  • the coating composition preferably has a very low binder, a low pigment content and a high pigment to binder ratio and/or very thin pigment particles.
  • the coating composition preferably comprises low solids, high viscosity binders.
  • the pigment to binder ratio is in the range of 5: 1 to 0.5: 1 by weight. More preferably, the pigment to binder ratio is by weight in the range of 4:1 to 1:1, and even more preferably 3:1 to 1.5:1. Most preferably the pigment to binder ratio is 2.5:1.
  • the metal pigment content by weight of the composition may be less preferably less than 10%.
  • the pigment content by weight of the composition is less than 6%, more preferably in the range of 0.1% to 6%, even more preferably in the range 0.1% to 3%, more preferably still in the range 0.2% to 2% by weight.
  • the compositions of the present invention can be applied to holograms for use on substrates such as security products, including identification documents like passports, identification cards, drivers licenses, or other verification documents, pharmaceutical apparel, software, compact discs, tobacco packaging and other products or packaging prone to counterfeiting or forgery, to protect them from fraudulent conversion, diversion or imitation.
  • the thickness of the pigment particles in the composition when deposited on a diffraction grating is sufficiently thin as to permit the at least partial transmission of light therethrough.
  • the thickness of the pigment particles may be less than lOOnm.
  • the thickness of the pigment particles is less than 50 nm. More preferably, the thickness of pigment particle is less than 35 nm. More preferably still, the thickness of pigment particle is less than 20 nm. Even more preferably still, the thickness of pigment particle is in the range 5 -18 nm. In one embodiment, the thickness of the pigment particles is in the range 10 - 50 nm. In another embodiment, the thickness of pigment particle is in the range 10 - 30 nm. In another embodiment, the average thickness of pigment particle is 17 nm.
  • the average thickness of pigment particle is 12.5 nm.
  • the substrate carrying the metallised image or pattern is subsequently over-laid onto printed pictures and/or text, or the substrate is preprinted with pictures and/or text and the metallised image or pattern is deposited thereon those pre-printed features are visible through the substrate and/or the metallic composition coated diffraction grating or image.
  • the coating compositions of the present invention may be deposited on a diffraction grating disposed on a substrate such as a substantially transparent, translucent, or opaque substrate.
  • the substrate may comprise paper, filmic material or metal, such as aluminium.
  • the substrate may comprise polymeric compounds.
  • the substrate may comprise papers made from wood pulp or cotton or synthetic wood-free fibres.
  • the diffraction grating may be formed using any methods known to the skilled man such as those described in US 4,913,858 and US 5,164,227.
  • the composition of the present invention may be applied to the substrate by means of conventional printing press such as gravure, rotogravure, flexographic, lithographic, offset, letterpress intaglio and/or screen process, or other printing process.
  • conventional printing press such as gravure, rotogravure, flexographic, lithographic, offset, letterpress intaglio and/or screen process, or other printing process.
  • the substrate carrying the enhanced diffractive image or pattern is subsequently over-laid onto printed pictures and/or text, or the substrate is pre-printed with pictures and/or text and the enhanced diffractive image or pattern is deposited thereon, those printed features are visible through the substrate and/or the metallic ink coated diffraction grating or image.
  • the composition may further comprise modifying additives, for example colorants and/or suitable solvent(s).
  • modifying additives for example colorants and/or suitable solvent(s).
  • the resin maintains adhesion of the composition to the surface of the diffraction grating.
  • Specific additives can be added to the composition to modify its chemicals and/or physical properties. Polychromatic effects can be achieved by the introduction of transparent organic pigments and/or solvent soluble dyestuffs into the ink, to achieve a range of coloured shades.
  • the binder resins may be initially dissolved in the appropriate solvent(s) to form liquid varnishes.
  • a high-speed blender to produce the composition.
  • the composition may be formulated in to an ink.
  • a metallic ink comprising metal pigment particles and a binder wherein the ratio of pigment to binder is sufficiently high as to permit the alignment of the pigment particles to the contours of a diffraction grating.
  • the coating composition (the combination of pigment content, pigment to binder ratio and pigment flake thickness) should preferably be chosen such that the coverage of flakes on the diffraction grating suits the desired application. For example, for a hologram which is desired to be partly transparent, to enable the substrate to be viewed through the hologram, the flake coverage of the substrate may be less than 100%.
  • a photomicrograph of a hologram of this type is shown in Fig. 1.
  • the coating composition of Fig. 2 comprises pigment D (see table 1 hereinbelow), 1.0% pigment content by weight of composition and a pigment to binder ratio of 1 : 1 by weight.
  • the coating composition of Fig. 3 comprises pigment B (see table 1 hereinbelow), 5% pigment content by weight of composition and a pigment to binder ratio of 0.3: 1 by weight. Virtually all the flakes can be seen to be flat, without the embossed texture.
  • Example 1 A 12-micron thick transparent carrier film, two meters wide, made of polythyleneterephthalate was obtained from ICI Films, Wilmington, Del., USA ( Melinex HS-2) was gravure coated with an acrylic resin, isobutyl methacrylate, obtained from DuPont (Elvacite 2045), and dried by means of hot air. In a second operation the acrylic-coated film was deposition coated with aluminium by means of a roll to roll vacuum chamber. The deposition rate and thickness of the vaporised aluminium layer over the printed acrylic coating were accurately controlled through continuous monitoring of the optical density during manufacture. The operating range of vacuum deposition was in the range 100 to 500 angstroms thick, the preferred thickness was in the range 190 to 210 angstroms thick.
  • the suspension of vacuum metallised aluminium flakes in ethyl acetate was mixed with nitrocellulose and polyurethane resins and ethyl acetate to make a coating composition.
  • the coatings were printed on an RK proofer press over a polyester film embossed with a diffraction grating pattern.
  • the holographic intensity (colour and brilliance) of the face (printed side) and reverse (viewed through the film) of the print were judged on a scale of 1 to 10, where 1 is worst and 10 best.
  • the flake thickness of the vacuum metallised pigments varied, as shown in Table 1. Two aluminium flake pigments manufactured by ball milling were included for comparison. Table 1
  • Pigments A, B, C & D were formulated into inks and printed onto film embossed with a diffraction grating, according to the method in Example 1. The quality of the resulting hologram was judged visually (Table 2).
  • Example 2 The vacuum metallised pigments used in Example 2 were replaced by thicker ball milled pigments. The pigment content of the ink was adjusted to allow for the thicker pigments, which have a lower coverage. The visual rating of the holographic effect is shown in Table 3. Table 3
  • the ball milled pigments did not give a suitable reflection enhancement layer on the reverse of the prints, because ball milled flakes are much less reflective than vacuum metallised pigments.
  • the face of the prints appeared silvery, not holographic, since the flakes were too thick to follow the contours of the embossed layer.
  • Example 4 Effect of flake thickness with pigment surface area constant The comparison of the effect of flake thickness shown in Example 2 was repeated, this time adjusting the pigment content according to the thickness of the flakes, to gives a constant surface area of pigment per unit of ink. This means that each of the inks would have an equal ability to cover the substrate (table 4).
  • Example 5 Effect of pigment to binder ratio
  • the thinnest flake (product D) was formulated into inks with different pigment to binder ratios, the pigment content being held constant. The visual ratings of the holographic effect are given in Table 5.
  • the best holographic effect on the reverse of the prints was obtained with the highest pigment to binder ratio.
  • the best holographic effect on the face of the prints was obtained at higher pigment to binder ratios, with an optimum between 1 :1 and 4:l.
  • the highest pigment loading gave the best effect on the reverse of the print, due to the higher number of flakes giving a better reflective mirror.
  • the best holographic effect on the face of the prints was at an intermediate pigment content, since too low a pigment content gives insufficient coverage and too high a pigment content gives overlapping flakes which do not follow the contours of the emboss.

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  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Inks, Pencil-Leads, Or Crayons (AREA)
  • Holo Graphy (AREA)

Abstract

L'invention concerne une composition de revêtement utilisée pour recouvrir un réseau de diffraction, qui comprend des particules de pigments métalliques et un liant, le rapport entre les pigments et le liant étant suffisamment élevé pour permettre l'alignement desdites particules avec les contours du réseau de diffraction.
PCT/GB2004/004805 2003-11-14 2004-11-12 Composition d'impression Ceased WO2005049745A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0326584.0 2003-11-14
GBGB0326584.0A GB0326584D0 (en) 2003-11-14 2003-11-14 Printing composition

Publications (1)

Publication Number Publication Date
WO2005049745A1 true WO2005049745A1 (fr) 2005-06-02

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Cited By (31)

* Cited by examiner, † Cited by third party
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EP1876604A4 (fr) * 2005-04-12 2008-06-04 Asahi Glass Co Ltd Composition d' encre et materiau metallique
DE112007002178T5 (de) 2006-09-15 2009-07-30 Securency International Pty Ltd., Craigieburn Mit Strahlung härtbare geprägte Tintensicherheitseinrichtungen für Sicherheitsdokumente
WO2009100938A1 (fr) * 2008-02-15 2009-08-20 Basf Coatings Ag Composition de revêtement aqueuse, procédé de fabrication et utilisation de cette composition
WO2010069823A1 (fr) * 2008-12-19 2010-06-24 Basf Se Flocons d'aluminium minces
WO2011018239A1 (fr) * 2009-08-14 2011-02-17 Eckart Gmbh Encre d'impression à jet d'encre renfermant des pigments à effet à brillance élevée
WO2011020727A1 (fr) 2009-08-21 2011-02-24 Basf Se Appareil et procédé pour un dispositif de support d'image variable optiquement et sub-microscopique
EP1862511A4 (fr) * 2005-03-22 2011-05-04 Seiko Epson Corp Pigment métallique, dispersion liquide de pigment, composition d'encre à pigment métallique et procédé d'impression par jet d'encre
WO2011064162A2 (fr) 2009-11-27 2011-06-03 Basf Se Compositions de revêtement destinées à des éléments de sécurité et à des hologrammes
CN101706593B (zh) * 2009-11-09 2011-08-10 中钞特种防伪科技有限公司 增强全息光学元件光学效果的方法
US8015919B2 (en) 2003-11-14 2011-09-13 Printetch Limited Security printing using a diffraction grating
DE112009002538T5 (de) 2008-10-17 2011-12-15 Securency International Pty Ltd. Passerverfahren und Vorrichtung für geprägte und gedruckte Merkmale
US8128744B2 (en) 2008-02-15 2012-03-06 BASF Coating GmbH Aqueous coating composition, method for production of the same, and use thereof
WO2011116036A3 (fr) * 2010-03-18 2012-03-22 The Gillette Company Articles à effets métallisés et holographiques
WO2012079674A1 (fr) * 2010-12-15 2012-06-21 Merck Patent Gmbh Procédé de production de motifs tridimensionnels dans des revêtements
DE112011100983T5 (de) 2010-03-24 2013-04-11 Securency International Pty Ltd. Sicherheitsdokument mit integrierter Sicherheitsvorrichtung und Herstellungsverfahren
DE112011102365T5 (de) 2010-08-11 2013-04-25 Securency International Pty Ltd. Optisch variable Einrichtung
US8993219B2 (en) 2011-06-21 2015-03-31 Basf Se Printing diffraction gratings on paper and board
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USD758744S1 (en) 2012-09-14 2016-06-14 Under Armour, Inc. Upper body garment with outer surface ornamentation
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