# US 7,612,131 B2 · Flame-retardant resin composition > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 7,612,131 B2 - Document ID: US7612131B2 - Status: Granted - Kind: B2 - Application number: 11/953,914 - Filed: 2007-12-11 - Published: 2008-07-10 - Granted: 2009-11-03 - Earliest claimed: 2006-12-21 - Assignees: WinTech Polymer Ltd. - Inventors: Shinya Yamada - Web page: https://patentgrep.com/patent/US7612131B2 ## CPC - C08L 67/02: Polyesters derived from dicarboxylic acids and dihydroxy compounds (C08L67/06 takes precedence) - C08K 5/1515: Three-membered rings - C08K 5/5313: Phosphinic compounds, e.g. R2=P(:O)OR' - C08K 2201/014: Additives containing two or more different additives of the same subgroup in C08K - C08L 67/025: {containing polyether sequences} - C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06) - C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09) ## Abstract A flame-retardant resin composition comprises 25 to 150 parts by weight of (B) a thermoplastic polyester1 elastomer, 5 to 40 parts by weight of (C) a phosphinic acid compound comprising a salt of at least one member selected from the group consisting of a phosphinic acid, a diphosphinic acid, and a polymerized product thereof, and 0.5 to 20 parts by weight of (D) an epoxy compound, relative to 100 parts by weight of (A) a polybutylene terephthalate-series resin. Such a flame-retardant resin composition is useful for various molded products and for covering the surface of an electric wire, or the like. The present invention provides a halogen-free flame-retardant resin composition which has a high heat resistance and a high flame retardancy and is excellent in hydrolysis resistance, abrasion resistance, and moldability (e.g., extrusion properties). ## Claims ### Claim 1 A flame-retardant resin composition, comprising (A) a polybutylene terephthalate-series resin, (B) a thermoplastic polyester elastomer, (C) a phosphinic acid compound comprising a salt of at least one member selected from the group consisting of a phosphinic acid, a diphosphinic acid, and a polymerized product thereof, and (D) an epoxy compound. ### Claim 2 (depends on 1) A resin composition according to claim 1, wherein the polyester elastomer (B) comprises a block copolymer of (b-1) a polyalkylene arylate hard block and (b-2) a polyester soft block. ### Claim 3 (depends on 1) A resin composition according to claim 1, wherein, regarding the phosphinic acid compound (C), the salt of a phosphinic acid is represented by the following formula (1), and the salt of a diphosphinic acid is represented by the following formula (2): wherein R1, R2, R3, and R4 are the same or different and each represents an alkyl group, a cycloalkyl group, an aryl group, or an aralkyl group, and R5 represents an alkylene group, an alicyclic bivalent group, or an aromatic bivalent group; R1 and R2 may bond together to form a ring with an adjacent phosphorus atom; Mm+ represents a metal having m-valences, and “m” denotes an integer of 2 to 4; Mn+ represents a metal having n-valences, and “n” denotes an integer of 2 to 4. ### Claim 4 (depends on 1) A resin composition according to claim 1, wherein the salt of a phosphinic acid and the salt of a diphosphinic acid are metal salts, and the metal constituting the metal salts is an alkaline earth metal or a metal of the group 13 of the Periodic Table of Elements. ### Claim 5 (depends on 1) A resin composition according to claim 1, wherein the epoxy compound (D) comprises at least one member selected from the group consisting of (d-1) an epoxy resin and (d-2) a vinyl-series copolymer having a glycidyl group. ### Claim 6 (depends on 1) A resin composition according to claim 1, which comprises 25 to 150 parts by weight of the polyester elastomer (B), 5 to 40 parts by weight of the phosphinic acid compound (C), and 0.5 to 20 parts by weight of the epoxy compound (D), relative to 100 parts by weight of the polybutylene terephthalate-series resin (A). ### Claim 7 (depends on 1) A resin composition according to claim 1, wherein the polybutylene terephthalate-series resin (A) has an intrinsic viscosity of 0.8 to 13 dL/g, the polyester elastomer (B) comprises a block copolymer of (b-1) a polybutylene terephthalate hard block and (b-2) a polyester soft block having at least one unit selected from the group consisting of a polyether unit and an aliphatic polyester unit, and the epoxy compound (D) comprises at least one member selected from the group consisting of (d-1) an aromatic epoxy resin having an epoxy equivalent of 250 to 1200 g/eq and (d-2) a copolymer of a vinyl-series monomer having a glycidyl group and a copolymerizable monomer having an α,β-unsaturated bond. ### Claim 8 (depends on 1) A covered or coated electric wire, which comprises an electric wire whose surface is covered or coated with a flame-retardant resin composition recited in claim 1. ### Claim 9 (depends on 1) A process for covering or coating an electric wire, which comprises covering or coating a surface of an electric wire with a flame-retardant resin composition recited in claim 1. ### Claim 10 (depends on 9) A process according to claim 9, wherein the surface of an electric wire is covered or coated with the use of an extrusion molding or a press processing.