# US 5,349,017 A · Polyvinyl chloride resin composition > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,349,017 A - Document ID: US5349017A - Status: Granted - Kind: A - Application number: 07/984,238 - Filed: 1992-12-01 - Granted: 1994-09-20 - Earliest claimed: 1990-07-24 - Assignees: Mitsubishi Rayon Co., Ltd. - Inventors: Koji Matsumoto; Masaru Morimoto; Masahiro Osuka; Naomi Uno - Web page: https://patentgrep.com/patent/US5349017A ## CPC - C08L 27/06: Homopolymers or copolymers of vinyl chloride - C08L 51/003: {grafted on to macromolecular compounds obtained by reactions only involving unsaturated carbon-to-carbon bonds (C08L51/04, C08L51/06 take precedence)} - C08L 51/00: Compositions of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds (for ABS polymers C08L55/02); Compositions of derivatives of such polymers - C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06) ## Abstract A polyvinyl chloride resin composition comprising (i) 100 parts by weight of a polyvinyl chloride resin and (ii) 2 to 40 parts by weight of a multi-stage copolymer obtained by polymerizing resin component formable monomers in the range of from more than 30 parts by weight to 50 parts by weight in three stages onto 50-70 parts by weight of a butadiene elastomer having a glass transition temperature ranging from -40.degree. C. to 5.degree. C. obtained by a copolymerization of a monomer mixture of 70 to 90% by weight of butadiene, 10 to 30 percent by weight of an aromatic vinyl monomer and a polyfunctional monomer added in an amount corresponding to 3 to 10 parts by weight per 100 parts by weight of the total amount of the butadiene and aromatic vinyl monomer. ## Claims ### Claim 1 A polyvinyl chloride resin composition having a high falling weight impact resistance, stress-whitening resistance and optical characteristics, comprising: 100 parts by weight of a polyvinyl chloride resin and 2 to 40 parts by weight of a multi-stage copolymer obtained by polymerizing resin component formable monomers in the range of from more than 30 parts by weight to 50 parts by weight, said resin component formable monomer being composed of 25 to 55% by weight of methyl methacrylate, 2 to 15% by weight of an alkyl acrylate having a C.sub.1 -C.sub.8 alkyl group and 30 to 60% by weight of an aromatic vinyl monomer in the presence of from 50 parts by weight to less than 70 parts by weight of a butadiene elastomer having a glass transition temperature of from -40.degree. C. to 5.degree. C. obtained by copolymerization of a monomer mixture of 70 to 90% by weight of butadiene, 10 to 30% by weight of an aromatic vinyl monomer and a polyfunctional monomer added in an amount corresponding to 3 to 10 parts by weight per 100 parts by weight of total amount of said butadiene and aromatic vinyl monomer, wherein a polymerization of the resin component formable monomer is conducted by polymerizing in the first stage methyl methacrylate in an amount corresponding to 45 to 85% by weight of the total amount of methyl methacrylate and the alkyl acrylate in an amount in the range specified above, subsequently polymerizing in the second stage the aromatic vinyl monomer in an amount in the range specified above in the presence of the polymer obtained in the previous stage, and further polymerizing in the third stage the remainder of methyl methacrylate in the presence of the polymers obtained in said first and second stages. ### Claim 2 (depends on 1) A polyvinyl chloride resin composition according to claim 1, wherein the butadiene is 1,3-butadiene. ### Claim 3 (depends on 1) A polyvinyl chloride resin composition according to claim 1, wherein the aromatic vinyl monomer as the constituent of the butadiene elastomer is styrene. ### Claim 4 (depends on 1) A polyvinyl chloride resin composition according to claim 1, wherein the polyfunctional monomer is divinylbenzene or 1,3-butylene glycol dimethacrylate. ### Claim 5 (depends on 1) A polyvinyl chloride resin composition according to claim 1, wherein the amount of the polyfunctional monomer is used in an amount corresponding to 3 to 8 parts by weight per 100 parts by weight of the total amount of said butadiene and aromatic vinyl monomer. ### Claim 6 (depends on 1) A polyvinyl chloride resin composition according to claim 1, wherein the amount of methyl methacrylate used in the first stage polymerization is an amount corresponding to 50 to 70% by weight of the total amount of methyl methacrylate. ### Claim 7 (depends on 1) A polyvinyl chloride resin composition according to claim 1, wherein the relative use ratio of methyl methacrylate and the alkyl acrylate in the first stage polymerization has a relationship of a major amount of methyl methacrylate and a minor amount of the alkyl acrylate. ### Claim 8 (depends on 1) A polyvinyl chloride resin composition according to claim 1, wherein the aromatic vinyl monomer of the resin component formable monomers is styrene. ### Claim 9 (depends on 1) A polyvinyl chloride resin composition according to claim 1, wherein the alkyl acrylate is ethyl acrylate or n-butyl acrylate.