# US 6,294,013 B1 · Polysaccharide pigment dispersions > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 6,294,013 B1 - Document ID: US6294013B1 - Status: Granted - Kind: B1 - Application number: 09/457,249 - Filed: 1999-12-08 - Granted: 2001-09-25 - Earliest claimed: 1999-12-08 - Assignees: Sun Chemical Corporation - Inventors: D. Mark Ortlano; Lori Lewis; Christopher J. Vissing; Joseph P. LaBazzo, Sr. - Web page: https://patentgrep.com/patent/US6294013B1 ## CPC - C09B 67/0063: {of organic pigments with only macromolecular substances} - 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 An aqueous pigment dispersion containing at least one FD&C and/or D&C pigment dispersed in water and a polysaccharide resin optionally in combination with a styrene-acrylic resin and ethylenediaminetetraacetic acid. The dispersion offers excellent viscosity and settling stability to pH-sensitive FD&C and D&C pigments together with good color value. ## Claims ### Claim 1 An aqueous pigment dispersion, comprising (i) a pigment selected from the group consisting of FD&C pigments and D&C pigments; (ii) a polysaccharide resin dispersant; and (iii) water. ### Claim 2 (depends on 1) The dispersion of claim 1, wherein said pigment is a FD&C pigment. ### Claim 3 (depends on 2) The dispersion of claim 2, wherein said FD&C pigment is selected from the group consisting of FD&C Red No. 40, FD&C Yellow No. 5, FD&C Yellow No. 6 and FD&C Blue No. 1. ### Claim 4 (depends on 1) The dispersion of claim 1, wherein said pigment is a D&C pigment. ### Claim 5 (depends on 4) The dispersion of claim 4, wherein said D&C pigment is selected from the group consisting of D&C Red No. 6, D&C Red No. 7, D&C Red No. 21, D&C Red No. 22, D&C Red No. 27, D&C Red No. 28, D&C Red No. 30, D&C Red No. 33, D&C Red No. 34, D&C Red No. 36, D&C Orange No. 5 and D&C Yellow No. 10. ### Claim 6 (depends on 1) The dispersion of claim 1, wherein said polysaccharide resin is selected from the group consisting of corn starch, cellulose and hydroxypropyl cellulose. ### Claim 7 (depends on 1) The dispersion of claim 1, wherein said pigment is present in an amount ranging from about 10 to about 35 weight percent based on the total weight of the dispersion. ### Claim 8 (depends on 7) The dispersion of claim 7, wherein said pigment is present in an amount ranging from about 15 to about 30 weight percent based on the total weight of the dispersion. ### Claim 9 (depends on 1) The dispersion of claim 1, wherein said polysaccharide resin is present in an amount ranging from about 5 to about 45 weight percent based on the total weight of the dispersion. ### Claim 10 (depends on 9) The dispersion of claim 9, wherein said polysaccharide resin is present in an amount ranging from about 10 to 40 weight percent based on the total weight of the dispersion. ### Claim 11 (depends on 1) The dispersion of claim 1, further comprising a styrene-acrylic resin. ### Claim 12 (depends on 1) The dispersion of claim 1, wherein said styrene-acrylic resin is selected from the group consisting of styrene/acrylic acid copolymer, styrene/acrylic acid/alkyl acrylate copolymer, styrene/methacrylic acid copolymer, styrene/methacrylic acid/alkyl acrylate copolymer. ### Claim 13 (depends on 11) The dispersion of claim 11, wherein said styrene-acrylic resin is present in an amount ranging from about 1 to 40 weight percent based on the total weight of the dispersion. ### Claim 14 (depends on 13) The aqueous pigment dispersion of claim 13, wherein said styrene-acrylic resin is present in an amount ranging from about 1 to 25 weight percent based on the total weight of the dispersion. ### Claim 15 (depends on 1) The dispersion of claim 1, further comprising a water-soluble organic co-solvent selected from the group consisting of alkanols, polyhydric alcohols and alkanolamines. ### Claim 16 (depends on 15) The dispersion of claim 15, wherein said co-solvent is an alkanol selected from the group consisting of methanol, ethanol, n-propanol, isopropanol, n-butanol, sec-butanol, and tert-butanol. ### Claim 17 (depends on 15) The dispersion of claim 15, wherein said co-solvent is a polyhydric alcohol selected from the group consisting of ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, tetraethylene glycol, polyethylene glycol and glycerol. ### Claim 18 (depends on 15) The dispersion of claim 15, wherein said co-solvent is an alkanolamine selected from the group consisting of monoethanolamine, diethanolamine and triethanolamine. ### Claim 19 (depends on 1) The dispersion of claim 1, further comprising a ligand. ### Claim 20 (depends on 19) The dispersion of claim 19, wherein said ligand is ethylenediaminetetraacetic acid or a salt thereof. ### Claim 21 A process for preparing aqueous pigment dispersion, comprising (i) homogenizing a pigment selected from the group consisting of FD&C pigments and D&C pigment; a polysaccharide resin dispersant and water to form a premix, and (ii) milling said premix until the mean particle size distribution of the pigment is less than one micron.