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WO2005109110A1 - Couche ultraviolette de protection pour encres imprimées - Google Patents

Couche ultraviolette de protection pour encres imprimées Download PDF

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Publication number
WO2005109110A1
WO2005109110A1 PCT/IL2004/000393 IL2004000393W WO2005109110A1 WO 2005109110 A1 WO2005109110 A1 WO 2005109110A1 IL 2004000393 W IL2004000393 W IL 2004000393W WO 2005109110 A1 WO2005109110 A1 WO 2005109110A1
Authority
WO
WIPO (PCT)
Prior art keywords
toner
toner particle
acrylate
image
toner 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/IL2004/000393
Other languages
English (en)
Inventor
Gal Haim Victor
Galia Golodetz
Ehud Chatow
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.)
Hewlett Packard Development Co LP
Original Assignee
Hewlett Packard Development Co LP
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 Hewlett Packard Development Co LP filed Critical Hewlett Packard Development Co LP
Priority to PCT/IL2004/000393 priority Critical patent/WO2005109110A1/fr
Priority to TW094114890A priority patent/TW200609693A/zh
Publication of WO2005109110A1 publication Critical patent/WO2005109110A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G9/00—Developers
    • G03G9/08—Developers with toner particles
    • G03G9/087—Binders for toner particles
    • G03G9/08742—Binders for toner particles comprising macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • G03G9/08759—Polyethers
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G8/00—Layers covering the final reproduction, e.g. for protecting, for writing thereon
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G9/00—Developers
    • G03G9/08—Developers with toner particles
    • G03G9/087—Binders for toner particles
    • G03G9/08702—Binders for toner particles comprising macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • G03G9/08706—Polymers of alkenyl-aromatic compounds
    • G03G9/08708—Copolymers of styrene
    • G03G9/08711—Copolymers of styrene with esters of acrylic or methacrylic acid
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G9/00—Developers
    • G03G9/08—Developers with toner particles
    • G03G9/087—Binders for toner particles
    • G03G9/08702—Binders for toner particles comprising macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • G03G9/08722—Polyvinylalcohols; Polyallylalcohols; Polyvinylethers; Polyvinylaldehydes; Polyvinylketones; Polyvinylketals
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G9/00—Developers
    • G03G9/08—Developers with toner particles
    • G03G9/087—Binders for toner particles
    • G03G9/08702—Binders for toner particles comprising macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • G03G9/08724—Polyvinylesters
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G9/00—Developers
    • G03G9/08—Developers with toner particles
    • G03G9/087—Binders for toner particles
    • G03G9/08702—Binders for toner particles comprising macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • G03G9/08726—Polymers of unsaturated acids or derivatives thereof
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G9/00—Developers
    • G03G9/08—Developers with toner particles
    • G03G9/087—Binders for toner particles
    • G03G9/08702—Binders for toner particles comprising macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • G03G9/08726—Polymers of unsaturated acids or derivatives thereof
    • G03G9/08728—Polymers of esters
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G9/00—Developers
    • G03G9/08—Developers with toner particles
    • G03G9/087—Binders for toner particles
    • G03G9/08702—Binders for toner particles comprising macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • G03G9/08726—Polymers of unsaturated acids or derivatives thereof
    • G03G9/08733—Polymers of unsaturated polycarboxylic acids
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G9/00—Developers
    • G03G9/08—Developers with toner particles
    • G03G9/087—Binders for toner particles
    • G03G9/08742—Binders for toner particles comprising macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • G03G9/08753—Epoxyresins
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G9/00—Developers
    • G03G9/08—Developers with toner particles
    • G03G9/087—Binders for toner particles
    • G03G9/08784—Macromolecular material not specially provided for in a single one of groups G03G9/08702 - G03G9/08775
    • G03G9/08793—Crosslinked polymers
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G9/00—Developers
    • G03G9/08—Developers with toner particles
    • G03G9/087—Binders for toner particles
    • G03G9/08784—Macromolecular material not specially provided for in a single one of groups G03G9/08702 - G03G9/08775
    • G03G9/08795—Macromolecular material not specially provided for in a single one of groups G03G9/08702 - G03G9/08775 characterised by their chemical properties, e.g. acidity, molecular weight, sensitivity to reactants
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G9/00—Developers
    • G03G9/08—Developers with toner particles
    • G03G9/087—Binders for toner particles
    • G03G9/08784—Macromolecular material not specially provided for in a single one of groups G03G9/08702 - G03G9/08775
    • G03G9/08797—Macromolecular material not specially provided for in a single one of groups G03G9/08702 - G03G9/08775 characterised by their physical properties, e.g. viscosity, solubility, melting temperature, softening temperature, glass transition temperature
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G9/00—Developers
    • G03G9/08—Developers with toner particles
    • G03G9/12—Developers with toner particles in liquid developer mixtures
    • G03G9/13—Developers with toner particles in liquid developer mixtures characterised by polymer components
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G9/00—Developers
    • G03G9/08—Developers with toner particles
    • G03G9/12—Developers with toner particles in liquid developer mixtures
    • G03G9/13—Developers with toner particles in liquid developer mixtures characterised by polymer components
    • G03G9/131—Developers with toner particles in liquid developer mixtures characterised by polymer components obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G9/00—Developers
    • G03G9/08—Developers with toner particles
    • G03G9/12—Developers with toner particles in liquid developer mixtures
    • G03G9/13—Developers with toner particles in liquid developer mixtures characterised by polymer components
    • G03G9/133—Graft-or block polymers
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G9/00—Developers
    • G03G9/08—Developers with toner particles
    • G03G9/12—Developers with toner particles in liquid developer mixtures
    • G03G9/135—Developers with toner particles in liquid developer mixtures characterised by stabiliser or charge-controlling agents
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G9/00—Developers
    • G03G9/08—Developers with toner particles
    • G03G9/12—Developers with toner particles in liquid developer mixtures
    • G03G9/135—Developers with toner particles in liquid developer mixtures characterised by stabiliser or charge-controlling agents
    • G03G9/1355—Ionic, organic compounds

Definitions

  • the present invention relates to electrophotographic toners that may be printed over an underlying layer to protect the underlying layer from UV light.
  • Printed inks or toners undergo degradation and fading as a result of exposure to light.
  • One method of providing a relatively lightfast ink or toner is to produce the ink or toner using relatively lightfast pigments.
  • Another method is to incorporate in the ink or toner UV absorbers and/or hindered amine light stabilizers (HALS) or antioxidants.
  • HALS hindered amine light stabilizers
  • the UV absorbers absorb UV energy incident on a layer of the printed ink or toner and dissipate the absorbed energy with little or no damage to pigments in the layer.
  • the HALS scavenge pigment damaging free radicals that are produced when UV light is incident on and would degrade pigments in the ink or toner layer were they not removed.
  • US Patent 5,426,491 to Landa describes inter alia a system in which a monomer or oligimer in a colored toner particle is cross-linked by ultraviolet radiation to form a coherent film on a photoreceptor or intermediate transfer member. This film is then transferred to a final substrate.
  • an aspect of some embodiments of the present invention relates to an electrophotographic toner transparent to visible radiation, hereinafter a "clear toner", that may be printed in a relatively thin layer over a printed surface using an electrophotographic printer to provide UV protection for the printed surface.
  • the clear toner comprises toner particles dispersed in a carrier liquid.
  • the toner particles are formed from a polymer in which a UV curable material is dispersed. Energy in UV light that is incident on a layer of the clear toner overprinted on a printed surface is absorbed by the UV curable material and cures the material.
  • a UV curable material may comprise a UV curable resin and/or a UV curable monomer.
  • a toner particle substantially transparent to visible light for use in a printing toner that may be printed over an underlying layer to improve the underlying layer's resistance to fading as a result of exposure to light, the toner particle comprising: a resin; and a UV curable material.
  • the concentration of the UV curable material is between about 5% and about 40% by weight of the solid components of the toner particle.
  • the concentration of the UV curable material is between about 10% and about 30% by weight of the solid components of the toner particle.
  • the concentration of UV curable material is about 20% of the solid components of the toner particles.
  • the UV curable material comprises a UV curable resin.
  • the UV curable resin is chosen from the group consisting of: Aromatic Urethane Acrylates; Aliphatic Urethane Acrylates; Epoxy Acrylates; Poyester Acrylates; Acrylated Silicone; Melamine Acrylate; and Amine Acrylate.
  • the UV curable material comprises a UV curable monomer.
  • the UV curable monomer is chosen from the group consisting of: Phenoxy ethyl acrylate (PEA); cyclic trimethylolpropane formal monoacrylate (CTFA); ethoxyethoxyethyl arylate (EOEOEA); isodecyl acrylate (IDA); 1,6 hexanediol diacrylate (HDDA); tripropylene glycol diacrylate (TPGDA); dipropylene glycol di acrylate (DPGDA); diacrylate (DA); trimethylolpropane triacrylate (TMPTA); ethoxylated TMPTA (TMP(EO)TA); glycerol propoxylate triacrylate (GPTA); alkoxylated pentaerythritol tetraacrylate (PPTTA); pentaerythritol tri-tetraacrylate (PETA); ditrimethylol
  • Ethylene acrylic acid and methacrylic acid copolymer resin Ethylene acrylic acid copolymer resin; Acid-modified ethylene acrylate copolymer resin; Copolymer of Ethylene - Glycidyl Methacrylate; Terpolymer of Ethylene - Methyl Acrylate - Glycidyl Methacrylate; and
  • the toner particle is charged.
  • a toner comprising toner particles in accordance with an embodiment of the invention dispersed in a carrier liquid.
  • carrier liquid comprises at least one liquid hydrocarbon.
  • the toner comprises a charge director for charging the toner particles.
  • the toner particles are suitable to develop a latent image by electrophoresis.
  • a method of providing UV protection for an image comprising: providing a printed image for which UV protection is desired; and overcoating at least selected portions of the printed image with toner particles or toner in accordance with any of the preceding claims.
  • the method comprises covering substantially only regions of the image having color.
  • the method optionally comprises covering substantially the entire area of the image.
  • the toner particles form a layer over regions of the image to which they are transferred that has a thickness less than or equal to about 5 microns.
  • the thickness of the layer is less than or equal to about 3 microns.
  • the thickness of the layer is equal to about 1 micron.
  • the method comprises: generating a charge distribution on a surface responsive to regions of the image for which UV protection is desired; adhering toner particles comprised in said toner to the surface; and transferring the toner particles to the printed image.
  • the inventive toners may be printed using an electrophotographic printing process in a thin layer over printed surfaces to protect the overprinted surfaces against UV damage.
  • a reference pigmented toner particle, indicated as RT, that does not comprise UV curable material is also listed in the table.
  • the reference toner may also be printed in a thin layer on a suitable substrate using an electrophotographic printing process.
  • a layer of each of the inventive clear toner particles is printed over a layer of the pigmented toner particles to provide UV protection to the pigmented toner. Improvement in the lightfastness of the pigmented toner layer resulting from overprinting with each of the inventive clear toners is indicated by a lightfastness figure of merit given in a column labeled
  • LF in Table 1 and discussed below.
  • Columns headed “P%”, “A%” and “UV Curable Material %” in the table respectively give the percent by weight of polymer, charge adjuvant and UV curable material comprised in the toner particles.
  • a column headed “PIG%” gives the percent of pigment that the reference pigmented toner particles (RT) comprise.
  • the listed ingredients are referred to as “solid” components and the listed percentages are exclusive of a liquid carrier that is solvated by the polymer during the process of manufacture of the particles. It is noted that even though the terminology “solid” is used, some of the components, e.g. a UV curable material, may normally be liquid at room temperature.
  • the reference toner (RT) comprises about 79% Bynel 2002 polymer (P%) manufactured by DuPont, about 1% charge adjuvant (A%) and about 20% of a pigment (PIG%), Paliotol Yellow Dl 155 (color index no PY185) manufactured by BASF.
  • the particles contain hydrocarbon liquid carrier (Isopar L, EXXON) that is solvated by the polymer during manufacture of the particles.
  • CT1 comprises about 79% Bynel 2002 and about 1% charge adjuvant by weight.
  • the toner particles comprise 20% of Actilane 440 (alkoxylated pentaerythritol tetraacrylate (PPTTA) manufactured by Akzo Nobel), which is a UV curable material.
  • the particles also contain solvated hydrocarbon liquid.
  • the listed toner CT2 which is a toner particle according to a second embodiment of the invention, is similar to CT1, except that the Actiline 440 is replaced by 20% by weight of Herberts Gloss Lacquer UV-GL-5300 (manufactured by DuPont Industrial Coatings, a division of Dupont Performance Coatings), which is also a UV curable material.
  • each of the inventive clear toner particles was printed (for example as toner particles in a liquid toner) over a layer of the pigmented toner particles (RT) printed on glossy paper to provide UV protection to the pigmented toner.
  • RT pigmented toner particles
  • a layer of the pigmented toner particles was printed on the paper but not overprinted with a UV protective coating.
  • the layer of unprotected pigmented toner particles had a lightfastness figure of merit of 40-46, which is given in the LF column in Table 1.
  • the figure of merit represents a number of years of exposure to sunlight that results in a decrease of about 35% in optical density of the printed layer of colored toner particles.
  • inventive clear toners were printed in layers having a thickness of about 1 micron, in some embodiments of the invention, clear protective toners are printed in layers having thickness other than 1 micron. In some embodiments of the invention, inventive clear toners are printed in layers having thickness greater than 1 micron. In some embodiments of the invention, the layers are greater than or equal to 2 microns. In some embodiments of the invention, the layers are greater than or equal to about 5 microns.
  • Inventive toners may also be printed in layers that are thinner than about 1 micron in accordance with an embodiment of the invention and such layers can be advantageous. It is expected that as thickness of a layer of a clear toner in accordance with an embodiment of the invention that overlays a pigmented toner layer increases, the inventive clear toner will provide greater UV protection for the underlying pigmented layer. The greater protection is a result of the increased amount of UV curable material overlaying the pigmented layer that results from the increased thickness of the clear layer.
  • a total amount of UV curable material is 20% by weight relative to the solid components of the particles.
  • concentration of the UV curable material may vary between about 10% and about 30% by weight of the solid components of the toner particle.
  • the amount of UV curable material in a toner particle may vary from about 5% by weight to about 40% by weight of the solid components of the particle.
  • any suitably transparent UV curable resin, or UV curable monomer may be used in the practice of an embodiment of the invention.
  • a curable material suitable for the practice of an embodiment of the invention may comprise any of the following UV curable resins: Aromatic Urethane Acrylates; Aliphatic Urethane Acrylates; Epoxy Acrylates; Poyester Acrylates; Acrylated Silicone; Melamine Acrylate; and Amine Acrylate.
  • a suitable curable material may also comprise any of the following monomers: Phenoxy ethyl acrylate (PEA); cyclic trimethylolpropane formal monoacrylate (CTFA); ethoxyethoxyethyl arylate (EOEOEA); isodecyl acrylate (IDA); 1,6 hexanediol diacrylate (HDDA); tripropylene glycol diacrylate (TPGDA); dipropylene glycol di acrylate (DPGDA); diacrylate (DA); trimethylolpropane triacrylate (TMPTA); ethoxylated TMPTA (TMP(EO)TA); glycerol propoxylate triacrylate (GPTA); alkoxylated pentaerythritol tetraacrylate (PPTTA); pentaerythritol tri-tetraacrylate (PETA); ditrimethylolpropane triacrylate (di-TMPTA); and dipentaerythritol
  • polymers other than Bynel 2022 may be used to provide clear toner particles in accordance with an embodiment of the invention.
  • polymers such as Ethylene acrylic acid copolymer resin, Ethylene acrylic acid and methacrylic acid copolymer resin, Copolymer of Ethylene - Glycidyl Methacrylate, Terpolymer of Ethylene - Methyl Acrylate - Glycidyl Methacrylate, or Terpolymer of Ethylene - Ethyl Acrylate - Maleic Anhydride may be used to provide the clear toner particles.
  • any of various charge adjuvants known in the art are useable in the practice of the invention. Any of various methods may be used to produce a clear toner in accordance with an embodiment of the invention, such as an exemplary inventive clear toner listed in Table 1 , from its ingredients.
  • the polymer e.g. Bynell 2022
  • the UV curable resin or monomer can optionally be loaded into a mixer, for example a Ross mixer, together with a quantity of carrier liquid (e.g. Isopar L) to provide a mixture having between about 10% and about 30% non-volatile solids.
  • carrier liquid e.g. Isopar L
  • the ingredients are then mixed for between about 0.5 to about 2.5 hours at a temperature between about 120°C to about 185°C to produce a slurry of polymer particles plasticized by solvation with the carrier liquid and comprising the UV curable resin or monomer.
  • the slurry is cooled to room temperature and then ground at a temperature between about 20°C to about 55°C in an attritor loaded with 3/16" carbon steel balls as grinding medium, together with a charge adjuvant (e.g. Aluminum Tristearate) and additional carrier liquid (e.g. Isopar L) as required to produce the desired toner.
  • a charge adjuvant e.g. Aluminum Tristearate
  • additional carrier liquid e.g. Isopar L
  • a "grinding period" of time required to properly grind the slurry, charge adjuvant and carrier liquid for a quantity of material that fills about a 750 ml attritor is between about 4 hours to about 8 hours.
  • the process results in a concentrate of toner particles in the carrier liquid, which as required is diluted with additional carrier liquid and the toner particles charged, for example, using a charge director as known in the art.
  • the above described method of preparing the toner and other suitable methods are well known in the art. The exact method of producing the toner is not believed to be critical to the practice of an embodiment of the invention.
  • the UV curable material is mixed with the polymer in the Ross mixer to provide the slurry
  • the slurry may be prepared without the UV curable material.
  • the UV curable material may be added after the slurry is prepared during the grinding stage in the preparation of the toner.
  • Inventive clear toners in accordance with embodiments of the invention can be printed using liquid toner imagers, such as for example liquid toner presses marketed by H-P Indigo. Pigmented layers over which such clear toners may be printed can also printed by such imagers or by other imagers known in the art.
  • a clear toner both before and after curing, is substantially transparent to visible light and does not substantially change the apparent color of an image over which it is applied.
  • each of the verbs, "comprise” “include” and “have”, and conjugates thereof, are used to indicate that the object or objects of the verb are not necessarily a complete listing of members, components, elements or parts of the subject or subjects of the verb.
  • the present invention has been described using detailed descriptions of embodiments thereof that are provided by way of example and are not intended to limit the scope of the invention.
  • the described embodiments comprise different features, not all of which are required in all embodiments of the invention. Some embodiments of the present invention utilize only some of the features or possible combinations of the features. Variations of embodiments of the present invention that are described and embodiments of the present invention comprising different combinations of features noted in the described embodiments will occur to persons of the art. The scope of the invention is limited only by the following claims.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Developing Agents For Electrophotography (AREA)

Abstract

La présente invention a trait à une particule de poudre imprimante transparente à la lumière visible destinée à être utilisée dans une encre d'impression pouvant être imprimée sur une couche sous-jacente pour l'amélioration de résistance de la couche sous-jacente à la décoloration due à l'exposition à la lumière, la particule d'encre imprimante comportant: une résine, et un matériau polymérisable aux rayons ultraviolets.
PCT/IL2004/000393 2004-05-10 2004-05-10 Couche ultraviolette de protection pour encres imprimées Ceased WO2005109110A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/IL2004/000393 WO2005109110A1 (fr) 2004-05-10 2004-05-10 Couche ultraviolette de protection pour encres imprimées
TW094114890A TW200609693A (en) 2004-05-10 2005-05-09 Lightfast toners

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/IL2004/000393 WO2005109110A1 (fr) 2004-05-10 2004-05-10 Couche ultraviolette de protection pour encres imprimées

Publications (1)

Publication Number Publication Date
WO2005109110A1 true WO2005109110A1 (fr) 2005-11-17

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Application Number Title Priority Date Filing Date
PCT/IL2004/000393 Ceased WO2005109110A1 (fr) 2004-05-10 2004-05-10 Couche ultraviolette de protection pour encres imprimées

Country Status (2)

Country Link
TW (1) TW200609693A (fr)
WO (1) WO2005109110A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2420316A (en) * 2004-11-23 2006-05-24 Agilent Technologies Inc System and method for creating document finishes
WO2007018503A1 (fr) * 2005-07-27 2007-02-15 Hewlett-Packard Development Company, L.P. Procédé et appareil pour impression électrostatique liquide
WO2008036099A1 (fr) * 2006-09-20 2008-03-27 Hewlett-Packard Development Company, L.P. Développateurs liquides avec des additifs durcissables aux uv et procédés pour leur préparation
WO2018192650A1 (fr) * 2017-04-19 2018-10-25 Hp Indigo B.V. Étiquettes

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2420316A (en) * 2004-11-23 2006-05-24 Agilent Technologies Inc System and method for creating document finishes
GB2420316B (en) * 2004-11-23 2008-07-30 Agilent Technologies Inc System and method for creating document finishes
WO2007018503A1 (fr) * 2005-07-27 2007-02-15 Hewlett-Packard Development Company, L.P. Procédé et appareil pour impression électrostatique liquide
US7544458B2 (en) 2005-07-27 2009-06-09 Hewlett-Packard Development Company, L.P. Composition, method and device for liquid electrophotographic printing
US8158321B2 (en) 2005-07-27 2012-04-17 Hewlett-Packard Development Company, L.P. Method and apparatus for liquid electrostatic printing
US8232037B2 (en) 2005-07-27 2012-07-31 Hewlett-Packard Development Company, L.P. Liquid developers with UV curable additives and methods for their preparation
WO2008036099A1 (fr) * 2006-09-20 2008-03-27 Hewlett-Packard Development Company, L.P. Développateurs liquides avec des additifs durcissables aux uv et procédés pour leur préparation
WO2018192650A1 (fr) * 2017-04-19 2018-10-25 Hp Indigo B.V. Étiquettes
US11067912B2 (en) 2017-04-19 2021-07-20 Hp Indigo B.V. Printed labels with an overcoat

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