# US 8,771,912 B2 · Emulsion coloring materials for ink jet printers and methods of producing the same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,771,912 B2 - Document ID: US8771912B2 - Status: Granted - Kind: B2 - Application number: 12/417,202 - Filed: 2009-04-02 - Published: 2010-01-28 - Granted: 2014-07-08 - Earliest claimed: 2008-07-24 - Assignees: Kabushiki Kaisha Toshiba - Applicants: Kenji Sano; Satoshi Takayama; Takeshi Gotanda; Yumiko Sekiguchi - Inventors: Kenji Sano; Satoshi Takayama; Takeshi Gotanda; Yumiko Sekiguchi - Web page: https://patentgrep.com/patent/US8771912B2 ## CPC - G03G 9/12: in liquid developer mixtures - C09D 11/32: characterised by colouring agents - C09D 11/50: Sympathetic, colour changing or similar inks - G03G: ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY - 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 (cosmetics A61K; processes for applying liquids or other fluent materials to surfaces, in general, B05D; staining wood B27K5/02; glazes or vitreous enamels C03C; natural resins, French polish, drying-oils, driers, turpentine, per se, C09F; polishing compositions other than French polish, ski waxes C09G; adhesives or use of materials as adhesives C09J; materials for sealing or packing joints or covers C09K3/10; materials for stopping leaks C09K3/12; processes for the electrolytic or electrophoretic production of coatings C25D) ## Abstract There is provided an emulsion coloring material which can be used on ordinary paper, has good color developability, and can be used for conventional erasable pens or printing inks of black or blue color, having sufficiently high densities. When use is made of an erasable emulsion coloring material capable of controlling color development and decolorization by the presence or absence of the interaction between a chromatic material and a color developer, the colored emulsion comprising a copolymer resin of at least one unit selected from styrene and styrene derivatives and at least one unit selected from an acrylic acid ester and a methacrylic acid ester having a substituent which comprises a carbon chain having 4 or more carbon atoms, coloring ability can be enhanced. ## Claims ### Claim 1 An emulsion coloring material for ink jet printer, comprising: an emulsion solution comprising water and a copolymer resin of styrene and 2-ethylhexylacrylate or butylacrylate a chromatic material; and a color developer, wherein the ratio of copolymerization of the copolymer resin [(styrene):(2-ethylhexylacrylate or butylacrylate)]is in a range from 7:3 to 9.5:0.5. ### Claim 2 (depends on 1) The coloring material according to claim 1, wherein the concentration of the solids comprised in the emulsion coloring material is 3 to 15% by weight of the emulsion coloring material. ### Claim 3 (depends on 1) The coloring material according to claim 1, wherein the copolymer resin comprises a copolymer that is a styrene:2-ethylhexylacrylate copolymer where the ratio of copolymerization of styrene:2-ethylhexylacrylate is 90:10. ### Claim 4 (depends on 1) The coloring material according to claim 1, wherein said chromatic material is crystal violet lactone, optionally mixed with at least one member selected from the group consisting of a diarylphthalide, a polyarylcarbinol, an acylauramine, an arylauramine, a rhodamine β-lactam, an indoline, and a spiropyran. ### Claim 5 (depends on 1) The coloring material according to claim 1, wherein said chromatic material is at least one member selected from the group consisting of diarylphthalide, a polyarylcarbinol, an acylauramine, an arylauramine, a rhodamine β-lactam, an indoline, a spiropyran, and a fluoran. ### Claim 6 An emulsion coloring material for ink jet printer, comprising: an emulsion solution comprising water and a copolymer resin styrene and 2-ethylhexylacrylate and butylacrylate a chromatic material; a color developer; and microparticles which are insoluble in inorganic solvents, wherein the chromatic material and the color developer react to form a reaction product that is present on the microparticles, and the ratio of copolymerization of the copolymer resin [(styrene):(2-ethylhexylacrylate or butylacrylate)] is in a range from 7:3 to 9.5:0.5. ### Claim 7 (depends on 6) The coloring material according to claim 6, wherein the microparticles are one or more members selected from the group consisting of silica microparticles, alumina fine powders and starches. ### Claim 8 (depends on 6) The coloring material according to claim 6, wherein the concentration of the solids comprised in the emulsion coloring material is 3 to 15% by weight of the emulsion coloring material. ### Claim 9 (depends on 6) The coloring material according to claim 6, wherein the insoluble microparticles are silica microparticles. ### Claim 10 (depends on 6) The coloring material according to claim 6, wherein said chromatic material is crystal violet lactone, optionally mixed with at least one member selected from the group consisting of a diarylphthalide, a polyarylcarbinol, an acylauramine, an arylauramine, a rhodamine β-lactam, an indoline, and a spiropyran. ### Claim 11 (depends on 6) The coloring material according to claim 6, wherein said chromatic material is at least one member selected from the group consisting of diarylphthalide, a polyarylcarbinol, an acylauramine, an arylauramine, a rhodamine β-lactam, an indoline, a spiropyran, and a fluoran. ### Claim 12 A method for manufacturing an emulsion coloring material for ink jet printer, comprising mixing an emulsion comprising: an emulsion solution comprising water and a copolymer resin styrene and 2-ethylhexylacrylate or butylacrylate; a chromatic material; and a color developer or mixing an emulsion comprising: an emulsion solution comprising water and a copolymer resin styrene and 2-ethylhexylacrylate or butylacrylate; a chromatic material; a color developer; and microparticles which are insoluble in organic solvents, wherein the chromatic material and the color developer react to form a reaction product that is present on the microparticles, and the mixing temperature is at most 30° C. ### Claim 13 (depends on 12) The method according to claim 12, wherein the ratio of copolymerization of the copolymer resin [(styrene):(2-ethylhexylacrylate or butylacrylate)] is in a range from 7:3 to 9.5:0.5. ### Claim 14 (depends on 12) The method according to claim 12, wherein said chromatic material is crystal violet lactone, optionally mixed with at least one member selected from the group consisting of a diarylphthalide, a polyarylcarbinol, an acylauramine, an arylauramine, a rhodamine β-lactam, an indoline, and a spiropyran. ### Claim 15 (depends on 12) The method according to claim 12, wherein said chromatic material is at least one member selected from the group consisting of diarylphthalide, a polyarylcarbinol, an acylauramine, an arylauramine, a rhodamine β-lactam, an indoline, a spiropyran, and a fluoran.