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: 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.

Abstract: There is provided a heat-resistant methacrylic resin composition, which comprises 1 to 99% by weight of a copolymer [I] obtained by copolymerizing methyl methacrylate, an aromatic vinyl compound and maleic anhydride and 99 to 1% by weight of a copolymer [II] obtained by copolymerizing 80 to 100% by weight of methyl methacrylate and 0 to 20% by weight of other copolymerizable ethylenic monomer.The resin composition according to the present invention is excellent in characteristics such as optical characteristics, mechanical properties, weathering resistance and molding processability as well as in productivity.

Abstract: An impact-resistant methacrylic resin composition comprising a multilayer structure methacrylic resin [II] is provided. The resin [II] is obtained by the following sequential four polymerization stages (i) through (iv):(i) forming 5-50 wt. parts of a hard crosslinked resin (A) containing at least 80 wt. % of methyl methacrylate units;(ii) obtaining 100 wt. parts of a multilayer structure acrylic elastomer [I] by forming on the periphery of resin (A) 95-50 wt. parts of a crosslinked acrylic acid ester copolymer (B) by polymerizing a monomer mixture comprising 69.9-89.9 wt. % of at least one alkyl (C.sub.1-8) acrylate, 10-30 wt. % of styrene or a mixture of styrene and a derivative thereof and 0.1-10 wt. % of ##STR1## (iii) forming on the periphery of elastomer [I] 5-100 wt. parts of a hard crosslinked resin (C) by polymerizing a crosslinkable monomer mixture comprising 80-99.9 wt. % of methyl methacrylate, 0-19.9 wt. % of at least one alkyl (C.sub.1-8) acrylate, 0-10 wt.

Abstract: A composition with high impact resistance and little fish eyes content, comprising 97 to 60 parts by weight of a polyvinyl chloride-base resin and 3 to 40 parts by weight of a graft copolymer obtained by the three-stage graft-polymerization of 65 to 25 parts by weight of a monomer combination (B) comprising 12 to 57% by weight of methyl methacrylate, 1 to 24% by weight of at least one of alkyl acrylates having a C.sub.