# US 5,703,198 A · Radiation curable binder composition for powder paint formulations > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,703,198 A - Document ID: US5703198A - Status: Granted - Kind: A - Application number: 08/506,615 - Filed: 1995-07-24 - Granted: 1997-12-30 - Earliest claimed: 1993-07-30 - Assignees: Dsm N.V. - Inventors: Freddy Twigt; Robert Van Der Linde - Web page: https://patentgrep.com/patent/US5703198A ## CPC - C09D 167/06: Unsaturated polyesters having carbon-to-carbon unsaturation - C09D 4/06: {Organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond} in combination with a macromolecular compound other than an unsaturated polymer of groups C09D159/00 - C09D187/00 - Y10T 428/31551: Of polyamidoester [polyurethane, polyisocyanate, polycarbamate, etc.] - 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) - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract The invention relates to a radiation curable binder composition for powder paint formulations. The binder composition comprises a) a polymer having a degree of unsaturation between 300 and 1800 grams per mole of unsaturated group (WPU), having a molecular weight Mn between 800 and 6800 and a viscosity between 1 dPas and 800 dPas and b) a crosslinking agent having vinyl ether, vinyl ester or (meth)acrylate functional groups. The polymer is an unsaturated polyester and/or an unsaturated polyacrylate. The binder composition can be used in the preparation of powder paint formulations which can be applied to heat-sensitive substrates such as wood and plastic and which can be cured with UV or electron beam radiation. ## Claims ### Claim 1 A powder paint containing a radiation curable binder composition for powder paint formulations comprising: a polymer having unsaturated groups, said polymer having a degree of unsaturation between about 300 grams and about 1,800 grams of polymer per mole of unsaturated group, a molecular weight, Mn, between 800 and 6,800 g/mol, and a viscosity between about 1 dPas and about 800 dPas; and a crosslinking agent having at least two functional groups selected from the group consisting of vinyl ether, vinyl ester, and (meth)acrylate functional groups, wherein said polymer and crosslinking agent are selected so that said composition is in solid particle form. ### Claim 2 (depends on 1) A powder paint according to claim 1, wherein said polymer having unsaturated groups is an unsaturated polyester or an unsaturated polyacrylate. ### Claim 3 (depends on 1) A powder paint according to claim 1, wherein the viscosity is between about 1 dPas and about 350 dPas. ### Claim 4 (depends on 1) A powder paint according to claim 1, wherein said crosslinking agent is a divinyl ether functionalized urethane compound. ### Claim 5 (depends on 1) A process for preparing a wholly or partially coated substrate which comprises applying a powder paint according to claim 1 to a heat sensitive substrate. ### Claim 6 (depends on 5) A process according to claim 5, wherein said heat-sensitive substrate is wood. ### Claim 7 (depends on 5) A process according to claim 5, wherein said process further comprises curing said powder paint with radiation. ### Claim 8 (depends on 7) A process according to claim 7, wherein said radiation is UV radiation. ### Claim 9 (depends on 7) A process according to claim 7, wherein said radiation is an electron beam radiation. ### Claim 10 (depends on 1) A powder coating obtained by curing a powder paint according to claim 1. ### Claim 11 (depends on 10) A substrate that is wholly or partially coated with said powder coating according to claim 10. ### Claim 12 A powder paint composition which comprises solid particles of a UV or EB radiation-curable binder comprised of (a) a polymer having unsaturated groups wherein said polymer has a degree of unsaturation between about 300 grams and about 1,800 grams of polymer per mole of unsaturated group, a molecular weight (Mn) between about 2500 and 4500 g/mol, and a viscosity between 1 dPas and 350 dPas, and (b) a crosslinking agent having at least two functional groups selected from the group consisting of vinyl ether, vinyl ester, and (meth)acrylate functional groups. ### Claim 13 (depends on 12) A powder paint composition according to claim 12, wherein said compositions contain a photoinitiator. ### Claim 14 (depends on 1) A powder paint according to claim 1, wherein said crosslinking agent comprises vinyl ether or vinyl ester functional groups.