Abstract: A lubricant for a thermoplastic resin, which is a three-stage polymer obtained by (A) polymerizing 80-100 w.t.% of methyl methacrylate and 0-20 w.t.% of other copolymerizable monomer so that the reduced viscosity .eta.sp/C of the obtained polymer is not higher than 2 dl/g, (B) polymerizing 30-70 weight parts of a monomer mixture composed of 20-80 w.t.% of an acrylic acid ester and 80-20 w.t.% of styrene or a substituted styrene in the presence of 10-60 weight parts of the polymer obtained at stage (A), so that the reduced viscosity .eta.sp/C of the copolymer obtained by polymerizing 5 to 30 weight parts of a monomer or monomer mixture composed of 50-100 w.t.% of a methacrylic acid ester and 0-50 w.t.% of other copolymerizable monomer in the presence of the two-stage polymer formed through stages (A) and (B), is that the total amount of the components used at staged (A), (B) and (C) is 100 weight parts and the reduced viscosity .eta.

Abstract: A lubricant for a thermoplastic resin, which is a three-stage polymer obtained by (A) polymerizing 80-100 w.t. % of methyl methacrylate and 0-20 w.t. % of other copolymerizable monomer so that the reduced viscosity .eta.sp/C of the obtained polymer is not higher than 2 dl/g, (B) polymerizing 30-70 weight parts of a monomer mixture composed of 20-80 w.t. % of an acrylic acid ester and 80-20 w.t. % of styrene or a substituted styrene in the presence of 10-60 weight parts of the polymer obtained at stage (A), so that the reduced viscosity .eta.sp/C of the copolymer obtained by polymerizing 5 to 30 weight parts of a monomer or monomer mixture composed of 50-100 w.t. % of a methacrylic acid ester and 0-50 w.t. % of other copolymerizable monomer in the presence of the two-stage polymer formed through stages (A) and (B), is that the total amount of the components used at staged (A), (B) and (C) is 100 weight parts and the reduced viscosity .eta.

Abstract: A weather resistant impact modifier for thermoplastic resins and a blend with the thermoplastic resin are disclosed. The modifier comprises a graft copolymer having a multi-layered structure which is obtained by graft polymerization of (c) 10-100 parts by weight of an aromatic vinyl compound or a monomer mixture mainly composed of an aromatic vinyl compound in a first stage and 10-100 parts by weight of a methacrylic ester or a monomer mixture mainly composed of a methacrylic ester in a second stage,(b) to 100 parts by weight of an elastomer obtained by polymerizing 98-60 parts by weight of a monomer mixture composed of 50-99.95% by weight of an acrylic ester, 0-50 wt % of a copolymerizable monomer and 0.05-5% by weight of a polyfunctional monomer,(a) in the presence of 2-40 parts by weight of a butadiene elastomer having a degree of swelling of 5-40 and an average particle size of not smaller than 0.15 .mu.m (wherein the total of (a) and (b) is 100 parts by weight).

Abstract: A processing aid for a thermoplastic resin is disclosed, which is a two-stage polymer obtained by polymerizing (B) 5 to 50 parts by weight of a monomer or monomer mixture composed mainly of methyl methacrylate in the presence of (A) 50 to 95 parts by weight of a polymer comprising 100 to 50% by weight of units of a methacrylic acid ester other than methyl methacrylate and 0 to 50% by weight of units of other monomer copolymerizable with the methacrylic acid ester and having a reduced viscosity .eta.sp/C not larger than 2.0 dl/g, so that the total amount of the components (A) and (B) is 100 parts by weight and the reduced viscosity .eta.sp of the final polymer is not larger than 2.0 dl/g. A thermoplastic resin having the processing aid incorporated therein has an improved shaping processability, and a shaped article mode therefrom has good surface characteristics.

Abstract: Disclosed is a modifier to be incorporated in a polyvinyl chloride resin, which is a graft copolymer obtained by carrying out, in the presence of 100 parts by weight of a butadiene rubber having a swelling degree of 10 to 50 and an average particle diameter of 0.1 to 0.4 .mu.m, first-stage graft polymerization of 1 of 42 parts by weight of methyl methacrylate and 0 to 5 parts by weight of an alkyl acrylate, second-stage graft polymerziation of 10 to 120 parts by weight of styrene and third-stage graft polymerization of 7 to 75 parts by weight to methyl methacrylate and 0 to 20 parts by weight of an alkyl acrylate, the content of the butadiene rubber in the graft copolymer being 35 to 75% by weight. The polyvinyl chloride resin composition having this modifier incorporated therein provides a molded article having excellent impact resistance, solvent resistance, and transparency.

Abstract: An impact modifier for a thermoplastic resin is disclosed, which comprises (I) 100 parts by weight of a graft copolymer formed by graft-polymerizing (B) a monomer having a vinyl group in the molecule onto (A) a butadiene polymer and, incorporated therein, (II) 0.01 to 5 parts by weight of a thioether type heat stabilizer, (III) 0.01 to 5 parts by weight of a phosphite type heat stabilizer and (IV) 0.01 to 5 parts by weight of a phenol type heat stabilizer having a molecular eight of at least 500. A thermoplastic resin composition having this impact modifier incorporated therein exhibits a good heat discoloration resistance and heat deterioration resistance under high-temperature conditions, as well as an improved impact resistance.

Abstract: Disclosed is a thermoplastic resin composition comprising (A) a graft copolymer obtained by emulsion-graft-polymerizing 0 to 20% by weight of an acrylic monomer and 0 to 60% by weight of an aromatic vinyl monomer in the presence of 40 to 80% by weight (as solids) of a diene type rubber polymer latex containing at least 50% by weight of a diene type rubber polymer having a weight average particle diameter of at least 0.3 .mu.m, and (B) a copolymer of an .alpha.,.beta.-unsaturated cyclic anhydride and an aromatic vinyl compound. The thermoplastic resin composition has a high heat resistance and impact resistance.

Abstract: Am impact modifier comprising a blend of 100 parts by weight of a graft copolymer (A) obtained by graft-polymerizing in a single or more stages a monomer or monomer mixture consisting of 95 to 100% by weight of at least one monomer selected from the group consisting of alkyl acrylates, alkyl methacrylates, aromatic vinyl compounds and vinyl cyanide compounds and 0 to 5% by weight of a polyfunctional crosslinking agent on an acrylic elastomer mainly composed of an alkyl acrylate and containing 0.1 to 5% by weight of a polyfunctional crosslinking agent and/or a butadiene elastomer composed of a polybutadiene or a copolymer of 50% by weight or more of a butadiene and 50% by weight or less of other vinyl compound copolymerizable therewith and containing 0 to 5% by weight of a polyfunctional crosslinking agent, and 0.

Abstract: Disclosed is a non-rigid vinyl chloride polymer composition comprising 100 weight parts of a vinyl chloride polymer resin, 5-50 weight parts of a graft copolymer modifier and 10-300 weight parts of a plasticizer. The graft copolymer modifier is obtained by graft-polymerizing 25-150 weight parts of an alkyl ester of methacrylic acid having 1 to 4 carbon atoms in the alkyl group or a monomer mixture composed of at least more than 50% by weight of said alkyl ester of methacrylic acid onto 100 weight parts of an acrylic elastomer having a swelling degree of 5 to 25 so that the grafting ratio is not larger than 50%. The acrylic elastomer is obtained by polymerizing a mixture comprising an alkyl ester of acrylic acid having 2 to 10 carbon atoms in the alkyl group or a monomer mixture composed of at least 50% by weight of said alkyl ester of acrylic acid, and a polyfunctional crosslinking agent.

Abstract: An impact modifier comprising a blend of 100 parts by weight of a multi-layer graft copolymer composed of monomers selected from the group consisting of alkyl acrylates, alkyl methacrylates, aromatic vinyl compounds, vinyl cyanide compounds and butadienes and having a multi-layer structure consisting of at least three layers (A), (B) and (C) in which the glass transition temperature of the polymer composing the outermost layer (A) is 0.degree. C. or below, the glass transition temperature of the polymer composing the second layer (B) from the outermost layer (A) is 60.degree. C. or above and the glass transition temperature of the polymer composing the third layer (C) from the outermost layer (A) is 0.degree. C. or below, each of the layers containing a polyfunctional crosslinking agent in an amount of 0 to 5% by weight based on the weight of the layer, and 0.