# US 5,349,007 A · Lightweight thermoplastic polyester molding compositions, methods of making the same and molded articles formed thereof > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,349,007 A - Document ID: US5349007A - Status: Granted - Kind: A - Application number: 08/084,439 - Filed: 1993-07-01 - Granted: 1994-09-20 - Earliest claimed: 1990-12-26 - Assignees: Polyplastics Co., Ltd.; Takeda Chemical Industries, Ltd. - Inventors: Hajime Serizawa; Masaru Kubota; Hiroyuki Sano; Yoshihisa Tajima - Web page: https://patentgrep.com/patent/US5349007A ## CPC - C08L 23/02: not modified by chemical after-treatment - C08F 255/00: Macromolecular compounds obtained by polymerising monomers on to polymers of hydrocarbons as defined in group C08F10/00 - C08F 283/02: on to polycarbonates or saturated polyesters {(C08F283/004 takes precedence)} - C08L 67/00: Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain (of polyester-amides C08L77/12; of polyester-imides C08L79/08); Compositions of derivatives of such polymers - C08L 67/02: Polyesters derived from dicarboxylic acids and dihydroxy compounds (C08L67/06 takes precedence) - C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06) - C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS ## Abstract Lightweight polyester resin molding compositions include a melt-blend of (A) between 97 to 20 parts by weight, based on 100 parts by weight of the total composition weight, of a polyester base resin, (B) between 3 to 80 parts by weight, based on 100 parts by weight of the total composition weight, of a polyolefin resin, (C) between 0.1 to 15 parts by weight, based on 100 parts by weight of the total composition weight, of a compatibilizing compound having a carbon-carbon double bond and an epoxy group in its molecule, (D) between 0.1 to 20% by weight, based on the weight of the compatibilizing compound, of a free radical initiator, and optionally, (E) up to 120 parts by weight, based on 100 parts by weight of the total composition, of a filler material. The free radical initiator is at least one compound having a one-minute half-life temperature of 130.degree. C. or greater, and is preferably pre-blended in solution form with the compatibilizing compound prior to being added to a melt of the polyester base resin and polyolefin resin. The resulting compositions may be molded to form relatively lightweight articles having minimal (if any) propensity to surface peel. ## Claims ### Claim 1 A polyester resin molding composition comprising: (A) between 97 to 20 parts by weight, based on 100 parts by weight of the total composition weight, of a polyester base resin; (B) between 3 to 80 parts by weight, based on 100 parts by weight of the total composition weight, of a polyolefin resin which is at least one selected from the group consisting of polyethylene, polypropylene, polymethylpentene, polybutylene and copolymers mainly comprised of the same; (C) between 0.1 to 15 parts by weight, based on 100 parts by weight of the total composition weight, of a compatibilizing compound which is at least one selected from the group consisting of N-(4-(2,3-epoxypropoxy)3-5-dimethylbenzyl)acrylamides and N-diallylaminoepoxy-propanes; and (D) between 0.1 to 20% by weight, based on the weight of the compatibilizing compound, of a free radical initiator. ### Claim 2 (depends on 1) A polyester resin composition as in claim 1, which further comprises (E) up to 120 parts by weight, based on 100 parts by weight of the total composition, of a filler material. ### Claim 3 (depends on 2) A polyester resin composition as in claim 2, wherein the filler material is in the form of fibers, powders, flakes and/or hollow filler materials. ### Claim 4 (depends on 1) A polyester resin composition as in claim 1, wherein said free radical initiator has a one-minute half-life temperature of 130.degree. C. or greater. ### Claim 5 (depends on 1) A polyester resin composition as in claim 1, wherein said free radical initiator is at least one selected from the group consisting of dicumyl peroxide, t-butyl cumyl peroxide, 2,5-dimethylhexane 2,5-dihydroperoxide, di-t-butyl peroxide, t-butyl cumyl peroxide, 2,5-dimethyl-2,5-di(t-butylperoxy) hexane, 2,5-dimethyl-2,5-di(t-butylperoxy)hexyne-3, n-butyl 4,4-bis(t-butylperoxy)valerate, 2,3-diethyl-2,3-diphenylbutane, 2,3-dimethyl-2,3-diphenylbutane, 2,3-dimethyl-2,3-di(P-methylphenyl)bulane and 2,3-dimethyl-2,3-di (bromophenyl)butane. ### Claim 6 (depends on 1) A polyester resin composition as in claim 1, wherein said polyester base resin is at least one selected from homopolyesters, copolyesters, halogenated polyesters, and polyester elastomers. ### Claim 7 (depends on 1, 2, 3, 4, 5, 6) A molded article which consists essentially of a polyester resin molding composition as in any one of claims 1-6. ### Claim 8 A process for making a polyester molding composition which comprises melt-blending the following components: (A) between 97 to 20 parts by weight, based on 100 parts by weight of the total composition weight, of a polyester base resin; (B) between 3 to 80 parts by weight, based on 100 parts by weight of the total composition weight, of a polyolefin resin; (C) between 0.1 to 15 parts by weight, based on 100 parts by weight of the total composition weight of a compatibilizing compound which is at least one selected from the group consisting of N-(4-(2,3-epoxypropoxy)3-5-dimethylbenzyl)acrylamides and N-diallylaminoepoxy-propanes; and (D) between 0.1 to 20% by weight, based on the weight of the compatibilizing compound, of a free radical initiator, wherein melt-blending is practiced for at least 30 seconds at a temperature of between 5.degree. to 100.degree. C. greater than the melting point of the resin components. ### Claim 9 (depends on 8) A process as in claim 8, which further comprises pre-blending in solution form said compatibilizing compound and said free radical initiator to obtain a solution mixture thereof, and then adding said solution mixture to a melt of said polyester base resin and said polyolefin resin. ### Claim 10 (depends on 8) A process as in claim 8, wherein said melt-blending is practiced for a time period between 1 to 10 minutes. ### Claim 11 (depends on 8) A process as in claim 8, which further comprises (E) up to 120 parts by weight, based on 100 parts by weight of the total composition, of a filler material. ### Claim 12 (depends on 8) A process as in claim 8, wherein the filler material is in the form of fibers, powders, flakes and/or hollow filler materials. ### Claim 13 (depends on 8) A process as in claim 8, wherein said free radical initiator has a one-minute half-life temperature of 130.degree. C. or greater. ### Claim 14 (depends on 13) A process as in claim 13, wherein said free radical initiator is at least one selected from the group consisting of dicumyl peroxide, t-butyl cumyl peroxide, 2,5-dimethylhexane 2,5-dihydroperoxide, di-t-butyl peroxide, t-butyl cumyl peroxide, 2,5-dimethyl-2,5-di(t-butylperoxy) hexane, 2,5-dimethyl-2,5-di(t-butylperoxy)hexyne-3, n-butyl 4,4-bis(t-butylperoxy)valerate, 2,3-diethyl-2,3-diphenylbutane, 2,3-dimethyl-2,3-diphenylbutane, 2,3-dimethyl-2,3-di (P-methylphenyl)bulane and 2,3-dimethyl-2,3-di (bromophenyl)butane. ### Claim 15 (depends on 8) A process as in claim 8, wherein said polyester base resin is at least one selected from homopolyesters, copolyesters, halogenated polyesters, and polyester elastomers. ### Claim 16 (depends on 8) A process as in claim 8, wherein said polyolefin resin is at least one selected from homopolymers or copolymers of polyethylene, polypropylene, polymethylpentene, and polybutylene.