# US 8,771,833 B2 · Laminated polyester film > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,771,833 B2 - Document ID: US8771833B2 - Status: Granted - Kind: B2 - Application number: 13/320,995 - Filed: 2010-05-24 - Published: 2012-05-17 - Granted: 2014-07-08 - Earliest claimed: 2009-05-25 - Assignees: Mitsubishi Plastics, Inc. - Applicants: Taishi Kawasaki; Masato Fujita - Inventors: Taishi Kawasaki; Masato Fujita - Web page: https://patentgrep.com/patent/US8771833B2 ## CPC - C09D 175/06: from polyesters - C08G 18/0823: {containing carboxylate salt groups or groups forming them} - C08G 18/12: using two or more compounds having active hydrogen in the first polymerisation step - C08G 18/6659: {with compounds of group C08G18/34} - C08L 61/28: with melamine - C09J 175/06: from polyesters - Y10T 428/31551: Of polyamidoester [polyurethane, polyisocyanate, polycarbamate, etc.] - Y10T 428/31565: Next to polyester [polyethylene terephthalate, etc.] - Y10T 428/31786: Of polyester [e.g., alkyd, 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) - C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS - C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06) - C09J: ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES (preparation of glue or gelatine C09H) - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract The present invention provides a laminated polyester film which can be suitably used in the applications requiring good adhesion to a micro-lens layer, a prism layer or the like, for example, in a backlight unit for liquid crystal displays, etc. The laminated polyester film of the present invention comprises a polyester film, and a coating layer formed on at least one surface of the polyester film by applying a coating solution comprising a urethane resin, an epoxy compound, an oxazoline compound and a melamine compound thereonto. ## Claims ### Claim 1 A laminated polyester film comprising a polyester film, a coating layer formed on at least one surface of the polyester film by applying a coating solution consisting of a urethane resin, an epoxy compound, an oxazoline compound and a melamine compound thereonto, and a prism layer or a micro-lens layer formed directly on the coating layer, wherein a content of the urethane resin in the coating layer is 20 to 90% by weight, a total content of the epoxy compound, the oxazoline compound and the melamine compound in the coating layer is 10 to 80% by weight, and the urethane resin is a self-emulsifiable urethane resin which is ionomerized by introducing a carboxyl group into a skeleton of the urethane resin and is obtained by using a polycarbonate polyol or a polyester polyol as a polyol. ### Claim 2 (depends on 1) A laminated polyester film according to claim 1, wherein the epoxy compound is a compound having an epoxy group in a molecule thereof, and prepolymer and cured product of the compound. ### Claim 3 (depends on 2) A laminated polyester film according to claim 2, wherein the epoxy compound is a condensate of epichlorohydrin with a hydroxyl group of ethylene glycol, polyethylene glycol, glycerol, polyglycerol, bisphenol A, or an amino group. ### Claim 4 (depends on 3) A laminated polyester film according to claim 3, wherein the epoxy compound is a polyglycerol polyglycidyl ether. ### Claim 5 (depends on 1) A laminated polyester film according to claim 1, wherein the oxazoline compound is a polymer having an oxazoline group. ### Claim 6 (depends on 5) A laminated polyester film according to claim 5, wherein the polymer having an oxazoline group is obtained by polymerizing an addition-polymerizable oxazoline group-containing monomer with other monomer. ### Claim 7 (depends on 6) A laminated polyester film according to claim 6, wherein the other monomer is a (meth)acrylic acid ester, an unsaturated carboxylic acid, an unsaturated nitrile, an unsaturated amide, a vinyl ester, a vinyl ether, α-olefin, a halogen-containing α,β-unsaturated monomer, an α,β-unsaturated aromatic monomer or mixture thereof. ### Claim 8 (depends on 1) A laminated polyester film according to claim 1, wherein the melamine compound has a melamine skeleton. ### Claim 9 (depends on 8) A laminated polyester film according to claim 8, wherein the melamine compound is an alkylolated melamine derivative, partially or completely etherified compound obtained by reacting the alkylolated melamine derivative with an alcohol, and a mixture of these compounds. ### Claim 10 (depends on 9) A laminated polyester film according to claim 9, wherein the melamine compound is hexamethoxymethyl melamine. ### Claim 11 A laminated polyester film comprising (1) a polyester film, (2) a coating layer formed on at least one surface of the polyester film by applying to the polyester film a coating solution consisting of a urethane resin, an epoxy compound, an oxazoline compound, a melamine compound, and (3) a prism layer or a micro-lens layer formed directly on the coating layer, particles, at least one additive selected from the group consisting of a defoaming agent, a coatability improver, a thickening agent, an organic lubricant, an antistatic agent, an ultraviolet absorber, an antioxidant, a foaming agent and a dye, and at least one binder polymer selected from the group consisting of an acrylic resin, polyvinyl resin, polyalkylene glycol, polyalkylene imines, methyl cellulose, hydroxy cellulose and starch, or mixture thereof, and wherein a content of the urethane resin in the coating layer is 20 to 90% by weight, a total content of the epoxy compound, the oxazoline compound and the melamine compound in the coating layer is 10 to 80% by weight, and the urethane resin is a self-emulsifiable urethane resin which is ionomerized by introducing a carboxyl group into a skeleton of the urethane resin and is obtained by using a polycarbonate polyol or a polyester polyol as a polyol. ### Claim 12 (depends on 11) A laminated polyester film according to claim 11, wherein the epoxy compound is a compound having an epoxy group in a molecule thereof, and prepolymer and cured product of the compound. ### Claim 13 (depends on 12) A laminated polyester film according to claim 12, wherein the epoxy compound is a condensate of epichlorohydrin with a hydroxyl group of ethylene glycol, polyethylene glycol, glycerol, polyglycerol, bisphenol A, or an amino group. ### Claim 14 (depends on 13) A laminated polyester film according to claim 13, wherein the epoxy compound is a polyglycerol polyglycidyl ether. ### Claim 15 (depends on 11) A laminated polyester film according to claim 11, wherein the oxazoline compound is a polymer having an oxazoline group. ### Claim 16 (depends on 15) A laminated polyester film according to claim 15, wherein the polymer having an oxazoline group is obtained by polymerizing an addition-polymerizable oxazoline group-containing monomer with other monomer. ### Claim 17 (depends on 16) A laminated polyester film according to claim 16, wherein the other monomer is a (meth)acrylic acid ester, an unsaturated carboxylic acid, an unsaturated nitrile, an unsaturated amide, a vinyl ester, a vinyl ether, α-olefin, a halogen-containing α,β-unsaturated monomer, an α,β-unsaturated aromatic monomer or mixture thereof. ### Claim 18 (depends on 11) A laminated polyester film according to claim 11, wherein the melamine compound has a melamine skeleton. ### Claim 19 (depends on 18) A laminated polyester film according to claim 18, wherein the melamine compound is an alkylolated melamine derivative, partially or completely etherified compound obtained by reacting the alkylolated melamine derivative with an alcohol, and a mixture of these compounds. ### Claim 20 (depends on 19) A laminated polyester film according to claim 19, wherein the melamine compound is hexamethoxymethyl melamine.