# US 10,246,601 B2 · Colored microparticle dispersion > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,246,601 B2 - Document ID: US10246601B2 - Status: Granted - Kind: B2 - Application number: 15/832,402 - Filed: 2017-12-05 - Published: 2018-04-05 - Granted: 2019-04-02 - Earliest claimed: 2013-12-16 - Assignees: Kao Corporation - Applicants: Kao Corporation - Inventors: Yuuta Matsumoto - Web page: https://patentgrep.com/patent/US10246601B2 ## CPC - C09D 17/001: {in aqueous medium (C09D17/003, C09D17/004 take precedence)} - C09B 67/009: {polymeric dispersing agent} - C09D 11/106: containing macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds - C09D 11/322: Pigment inks - C09D 11/326: characterised by the pigment dispersant - C09D 17/00: Pigment pastes, e.g. for mixing in paints (artists' paints C09D5/06) - 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) - C09B: ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES {, e.g. PIGMENTS}; MORDANTS; LAKES (fermentation or enzyme using processes to synthesise a desired chemical compound C12P) ## Abstract A colored fine particle dispersion including emulsified particles including a pigment and a polymer containing a constitutional unit derived from a compound (A) represented by formula (I) and a constitutional unit derived from a polymerizable monomer component including a hydrophobic vinyl-based monomer: wherein BO is a butyleneoxy group; EO is an ethyleneoxy group; M is a cation; m represents an average molar number of addition of BO and is a number of not less than 1 and not more than 10; and n represents an average molar number of addition of EO and is a number of not less than 4 and not more than 25; a process for producing the colored fine particle dispersion; a water-based ink for ink-jet printing including the colored fine particle dispersion; and a use of the colored fine particle dispersion as a colorant for a water-based ink for ink-jet printing. ## Claims ### Claim 1 A water-based ink for ink-jet printing, comprising a colored fine particle dispersion, in which: a content of water is not less than 20% by mass and not more than 60% by mass; the colored fine particle dispersion comprises emulsified particles comprising a pigment and a polymer comprising a constitutional unit derived from a compound (A) represented by the following general formula (I) and a constitutional unit derived from a polymerizable monomer component comprising a hydrophobic vinyl-based monomer; wherein BO is a butyleneoxy group, which is at least one group selected from the group consisting of a butane-1,2-diyloxy group, a butane-1,3-diyloxy group and a tetramethyleneoxy group; EO is an ethyleneoxy group; M is a cation; m represents an average molar number of addition of BO and is a number of not less than 1 and not more than 10; and n represents an average molar number of addition of E O and is a number of not less than 4 and not more than 25 , wherein a content of the constitutional unit derived from said compound (A) is in the range 3 to 20 parts by mass in terms of the monomer based on 100 parts by mass of the constitutional unit derived from said polymerizable monomer component; the polymerizable monomer component comprises an ionic monomer; and a content of the ionic monomer in the polymerizable monomer component is not less than 2% by mass and not more than 20% by mass. ### Claim 2 (depends on 1) The water-based ink for ink-jet printing according to claim 1, wherein the emulsified particles have an average particle size of not less than 40 nm and not more than 150 nm. ### Claim 3 (depends on 1) The water-based ink for ink-jet printing according to claim 1, wherein the hydrophobic vinyl-based monomer is at least one compound selected from the group consisting of a (meth)acrylic acid ester and an aromatic ring-containing hydrophobic monomer. ### Claim 4 (depends on 1) The water-based ink for ink-jet printing according to claim 1, wherein the pigment is a pigment subjected to no hydrophilic treatment. ### Claim 5 (depends on 1) The water-based ink for ink-jet printing according to claim 1, wherein the ionic monomer is a carboxylic acid monomer. ### Claim 6 (depends on 1) The water-based ink for ink-jet printing according to claim 1, wherein the ionic monomer is at least one compound selected from the group consisting of an acrylic acid and a methacrylic acid. ### Claim 7 (depends on 1) The water-based ink for ink-jet printing according to claim 1, wherein a content of the hydrophobic monomer in the polymerizable monomer component is not less than 70% by mass and not more than 98% by mass. ### Claim 8 (depends on 1) The water-based ink for ink-jet printing according to claim 1, wherein the pigment is coated with the polymer. ### Claim 9 (depends on 1) The water-based ink for ink-jet printing according to claim 1, wherein a content of the pigment in the water-based ink is not less than 1% by mass and not more than 15% by mass. ### Claim 10 (depends on 1) The water-based ink for ink-jet printing according to claim 1, wherein a content of the polymer in the water-based ink is not less than 0.5% by mass and not more than 30% by mass. ### Claim 11 (depends on 1) The water-based ink for ink-jet printing according to claim 1, wherein the mass ratio of the pigment to the polymer [pigment/polymer] in the water-based ink is not less than 0.1 and not more than 4.0. ### Claim 12 (depends on 1) The water-based ink for ink-jet printing according to claim 1, wherein the viscosity of the water-based ink as measured at 32° C. is not less than 2.0 mPa·s and not more than 12 mPa·s. ### Claim 13 (depends on 1) The water-based ink for ink-jet printing according to claim 1, wherein the static surface tension of the water-based ink as measured at 20° C. is not less than 20 mN/m and not more than 50 mN/m. ### Claim 14 A water-based ink for ink-jet printing, comprising a colored fine particle dispersion, in which: a content of water is not less than 20% by mass and not more than 60% by mass; the colored fine particle dispersion comprises emulsified particles comprising a pigment and a polymer comprising a constitutional unit derived from a compound (A) represented by the following general formula (I) and a constitutional unit derived from a polymerizable monomer component comprising a hydrophobic vinyl-based monomer; wherein BO is a butyleneoxy group, which is at least one group selected from the group consisting of a butane-1,2-diyloxy group, a butane-1,3-diyloxy group and a tetramethyleneoxy group; EO is an ethyleneoxy group; M is a cation; m represents an average molar number of addition of BO and is a number of not less than 1 and not more than 10; and n represents an average molar number of addition of EO and is a number of not less than 4 and not more than 25, wherein a content of the constitutional unit derived from said compound (A) is in the range 3 to 20 parts by mass in terms of the monomer based on 100 parts by mass of the constitutional unit derived from said polymerizable monomer component; the polymerizable monomer component comprises an ionic monomer; a content of the ionic monomer in the polymerizable monomer component is not less than 2% by mass and not more than 20% by mass; and wherein the pH value of the water-based ink is not less than 7.0 and not more than 11.0. ### Claim 15 (depends on 1) An ink-jet printing method using the water-based ink for ink-jet printing according to claim 1, which method comprises a step of printing characters or images on a recording medium by ejecting the water-based ink. ### Claim 16 (depends on 15) The ink-jet printing method according to claim 15, wherein the water absorption of the recording medium as measured by contacting with pure water for 100 ms is not less than 0 g/m2 and not more than 10 g/m2. ### Claim 17 (depends on 15) The ink-jet printing method according to claim 15, wherein the recording medium is a coated paper or a synthetic resin film. ### Claim 18 (depends on 15) The ink-jet printing method according to claim 15, which further comprises a drying step of drying and heating the printed materials after the printing of the characters or images.