# US 4,395,515 A · Resin dispersions having high pigment binding capacity > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 4,395,515 A - Document ID: US4395515A - Status: Granted - Kind: A - Application number: 06/334,228 - Filed: 1981-12-24 - Granted: 1983-07-26 - Earliest claimed: 1981-01-22 - Assignees: Rohm Co., Ltd. - Inventors: Horst Dinklage; Herbert Fink; Peter Frank; Hubert Rauch; Werner Siol - Web page: https://patentgrep.com/patent/US4395515A ## CPC - C09D 11/107: from unsaturated acids or derivatives thereof - C08F 2/24: with the aid of emulsifying agents - C08F 220/04: Acids; Metal salts or ammonium salts thereof - C08F 220/06: Acrylic acid; Methacrylic acid; Metal salts or ammonium salts thereof - 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) - C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS ## Abstract What are disclosed are methods for making an aqueous dispersion of a synthetic resin copolymer, said dispersion having high pigment binding capacity and adaptable to use in the preparation of printing inks or pastes, said copolymer comprising a predominant amount of water insoluble monomers together with from 3 to 8 percent by weight of an acid component which is a water soluble acid or salt, which method comprises gradually adding said water insoluble monomers, together with a portion of said acid component, to an aqueous medium containing the balance of the acid component in the form of a dissolved water soluble salt; aqueous synthetic resin dispersions made by these methods; and printing inks comprising such an aqueous synthetic resin dispersion which has been neutralized and combined with such an amount of an organic solvent as converts the dispersion into a solution or colloidal dispersion of the synthetic resin. ## Claims ### Claim 1 A method for making an aqueous dispersion of a synthetic resin copolymer by the free radical copolymerization of from 92 to 97 percent, by weight of the copolymer, of water insoluble ethylenically unsaturated monomers and from 3 to 8 percent, by weight of the copolymer, of an acid component selected from the group consisting essentially of .alpha.,.beta.-ethylenically unsaturated mono- and di-carboxylic acids and the water soluble salts thereof, the weight of salt in each instance being calculated as the weight of the corresponding free acid, said dispersion having high pigment binding capacity, which method comprises gradually adding said water insoluble monomers, under free radical copolymerization conditions, together with a portion of said acid component which is at least 2 percent by weight of the copolymer, to an aqueous medium comprising from 1 to 4 percent, by weight of the copolymer, of at least one water soluble salt of a mono- or di-carboxylic acid forming the remainder of said acid component. ### Claim 2 (depends on 1) A method as in claim 1 wherein said copolymer has a T.sub..lambda.max -value above 40.degree. C. ### Claim 3 (depends on 1) A method as in claim 1 wherein said aqueous medium comprises the total amount of water to be present in the aqueous dispersion which is to be prepared. ### Claim 4 (depends on 1) A method as in claim 1 wherein said aqueous medium comprises only a portion of the water to be present in the aqueous dispersion which is to be prepared and the balance of said water is added together with said water insoluble monomers and said portion of said acid component in the form of an aqueous emulsion of said monomers. ### Claim 5 (depends on 4) A method as in claim 4 wherein some of said portion of said acid component is present in the form of a water soluble salt. ### Claim 6 (depends on 1) An aqueous dispersion prepared by the method of claim 1. ### Claim 7 (depends on 3) An aqueous dispersion prepared by the method of claim 3. ### Claim 8 (depends on 4) An aqueous dispersion prepared by the method of claim 4. ### Claim 9 (depends on 5) An aqueous dispersion prepared by the method of claim 5. ### Claim 10 (depends on 6) A printing ink or paste comprising (a) an aqueous dispersion of a synthetic resin as in claim 6 adjusted to a pH of at least 7; (b) an amount of an organic solvent, capable of dilution with water, sufficient to convert said dispersion (a) into a solution or colloidal dispersion of said synthetic resin; and (c) from 2 to 20 percent, by weight of said ink or paste, of at least one member selected from the group consisting of dyes and pigments.