# US 10,501,586 B2 · Polyester-based resin particles, process for producing same, and use thereof > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,501,586 B2 - Document ID: US10501586B2 - Status: Granted - Kind: B2 - Application number: 15/746,153 - Filed: 2016-08-18 - Published: 2018-07-26 - Granted: 2019-12-10 - Earliest claimed: 2015-09-28 - Assignees: Sekisui Plastics Co., Ltd. - Applicants: Sekisui Plastics Co., Ltd. - Inventors: Akiyoshi Kusaka; Kaori Kuwagaki; Ryosuke Harada - Web page: https://patentgrep.com/patent/US10501586B2 ## CPC - C08J 3/12: Powdering or granulating - C08J 7/0427: {with only one layer of a composition containing a polymer binder (with more layers C08J7/042)} - A61K 8/0241: {Containing particulates characterized by their shape and/or structure (see also A61K8/04, A61K8/11, and A61K8/14, further aspects are classified in A61K2800/40 and subcodes)} - A61K 8/85: Polyesters - A61Q 1/12: Face or body powders for grooming, adorning or absorbing - A61Q 19/00: Preparations for care of the skin - A61Q 19/007: {Preparations for dry skin} - C08G 63/183: Terephthalic acids - C09D 5/00: Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced {(electrically insulating plastics, resins or waxes H01B3/30)}; Filling pastes - C09D 7/40: Additives - C09D 7/65: macromolecular (C09D7/41-C09D7/48 take precedence) - C09D 7/69: {Particle size larger than 1000 nm} - A61K 2800/262: Transparent; Translucent - A61K 2800/28: Rubbing or scrubbing compositions; Peeling or abrasive compositions; Containing exfoliants - A61K 2800/412: Microsized, i.e. having sizes between 0.1 and 100 microns - C08J 2367/02: Polyesters derived from dicarboxylic acids and dihydroxy compounds; (C08J2367/06 takes precedence) - C08J 2381/06: Polysulfones; Polyethersulfones - C08J 2453/00: Characterised by the use of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives of such polymers - C08J: WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H (working, e.g. shaping, of plastics B29) - A61K: PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES (devices or methods specially adapted for bringing pharmaceutical products into particular physical or administering forms A61J3/00; chemical aspects of, or use of materials for deodorisation of air, for disinfection or sterilisation, or for bandages, dressings, absorbent pads or surgical articles A61L; soap compositions C11D) - A61Q: SPECIFIC USE OF COSMETICS OR SIMILAR TOILETRY PREPARATIONS - C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS - 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) ## Abstract Polyester-based resin particles including a polyester-based resin as a base resin, in which the base resin exhibits a plurality of endothermic peaks corresponding to crystal melting temperatures by DSC measurement, at least one of the endothermic peaks exists in each region of a low temperature side region and a high temperature side region, a maximum endothermic peak of the low temperature side region and a maximum endothermic peak of the high temperature side region exhibit a crystal melting heat amount ratio (low temperature side crystal melting heat amount/high temperature side crystal melting heat amount) in a range of 0.1 to 1.5, and the polyester-based resin particles have a volume average particle diameter of 1 to 50 μm. ## Claims ### Claim 1 Polyester-based resin particles comprising a polyester-based resin as a base resin, wherein said base resin exhibits a plurality of endothermic peaks corresponding to crystal melting temperatures by DSC measurement, at least one of said endothermic peaks exists in each region of a low temperature side region and a high temperature side region, a maximum endothermic peak of said low temperature side region and a maximum endothermic peak of said high temperature side region exhibit a crystal melting heat amount ratio (low temperature side crystal melting heat amount/high temperature side crystal melting heat amount) in a range of 0.1 to 1.5, said polyester-based resin particles have a volume average particle diameter of 1 to 50 μm, and said polyester-based resin particles have a crystallization degree of 30 to 50% and do not contain thread-like particles. ### Claim 2 (depends on 1) The polyester-based resin particles according to claim 1, wherein said polyester-based resin is polyethylene terephthalate. ### Claim 3 (depends on 1) The polyester-based resin particles according to claim 1, wherein the maximum endothermic peak of said low temperature side region exhibits a maximum peak value at a range of 230° C. or higher and lower than 250° C., and the maximum endothermic peak of said high temperature side region exhibits a maximum peak value at a range of higher than 250° C. and 260° C. or lower. ### Claim 4 (depends on 1) The polyester-based resin particles according to claim 1, wherein the maximum endothermic peak of said low temperature side region exhibits a crystal melting heat amount of 5 to 35 J/g, and the maximum endothermic peak of said high temperature side region exhibits a crystal melting heat amount of 20 to 50 J/g. ### Claim 5 (depends on 1) A method for producing the polyester-based resin particles as defined in claim 1, comprising the steps of: contacting a polyester-based raw material resin having an intrinsic viscosity of 0.5 to 1.3 dl/g and a crystallization degree by DSC measurement of 30 to 50%, with a glycol ether-based solvent; and grinding a mixture after the contact, wherein said contact is performed under a temperature of a crystallization temperature of a polyester-based raw material resin or higher, and said glycol ether-based solvent is 3-methoxy-3-methyl-1-butanol. ### Claim 6 (depends on 1) A coating material blending with the polyester-based resin particles as defined in claim 1. ### Claim 7 (depends on 1) A cosmetic material blending with the polyester-based resin particles as defined in claim 1.