Abstract: A vinyl chloride resin composition is prepared by (1) preparing an acrylic elastomer (A) by (a) polymerizing 30 to 50% by wt of an aromatic vinyl monomer in the presence of a polyfunctional cross-linking agent having at least one allyl group and a carboxylate anion surfactant as an emulsifier at a pH maintained between 7.0-9.5 and then (b) graft-polymerizing 50 to 70% by wt of an alkyl acrylate of 2 to 10 carbon atoms in the alkyl group onto said polymerized aromatic vinyl polymer in the presence of from 0.

Abstract: A multi-layer structure polymer composition composed of an innermost layer (A), an elastomeric layer (B), an outermost layer (C), and at least one intermediate layer, said layer (A) having a glass transition temperature (Tg) of 10.degree. C. or higher and consisting of the reaction product of 51 to 100 parts by weight of an alkyl methacrylate whose alkyl group has 4 or less carbon atoms, 0 to 49 parts by weight of a copolymerizable monomer, 0 to 10 parts by weight of a polyfunctional monomer, and 0.1 to 5 parts by weight of a graftlinking agent; said layer (B) having a glass transition temperature (Tg) of 0.degree. C. or lower and consisting of the reaction product of 80 to 100 parts by weight of an alkyl acrylate whose alkyl group has 8 or less carbon atoms, 0 to 20 parts by weight of a copolymerizable monomer, 0 to 10 parts by weight of a polyfunctional monomer, and 0.1 to 5 parts by weight of a graftlinking agent; said layer (C) having a glass transition temperature (Tg) of 50.degree. C.

Abstract: A thermoplastic vinyl chloride polymer composition superior in processing properties is provided. The composition comprises (I) a predominant amount of polyvinyl chloride or a copolymer predominantly comprised of vinyl chloride and (II) a minor amount of two stage sequentially produced methyl methacrylate composite polymer consisting essentially of1 to 49 wt. % of component A polymerized from a monomer or monomer mixture of 90 to 100 wt. % of methyl methacrylate and 0 to 10 wt. % of at least one copolymerizable unsaturated monomer, said component A having a glass transition temperature of at least 75.degree. C and a reduced viscosity of 1.8 to approximately 10; and51 to 99 wt. % of component B polymerized onto or in the presence of said component A from a monomer mixture of 55 to 90 wt. % of a methyl methacrylate, 10 to 45 wt. % of an acrylic acid ester and 0 to 20 wt.

Abstract: Provided are vinyl chloride polymer compositions having a composite elastomer modifier incorporated therein, whereby said polymers exhibit on excellent balance of the physical properties of thermal resistance, transparency, and impact resistance. The composite elastomer modifier is comprised of (A) 20 to 60% by weight of a graft copolymer prepared by grafting methyl methacrylate and styrene onto a butadiene rubber in a specified sequential multi-stage polymerization procedure of (B) 40 to 80% by weight of a copolymer comprised of .alpha.-methylstyrene, methyl methacrylate and acrylonitrile. The composite elastomer modifier may be prepared by either blending graft copolymer (A) with copolymer (B) or by polymerizing a monomer charge of copolymer (B) in the presence of graft copolymer (A).

Abstract: A transparent vinyl chloride resin composition excellent in surface gloss and resistant to weathering and impact, comprising 97 to 60 parts by weight of a vinyl-chloride polymer and 3 to 40 parts by weight of a graft copolymer (B) obtained by emulsion-polymerizing a mixture of an aromatic vinyl monomer and a polyfunctional crosslinking agent having at least one allyl group, then polymerizing, in the presence of the resulting polymer latex, a mixture of an alkyl acrylate having 2 to 10 carbon atoms in the alkyl group and a polyfunctional crosslinking agent having at least one allyl group to form an acrylic elastomer (A) in the first stage the proportions of said alkyl acrylate and said aromatic vinyl monomer being 50 to 70% by weight and 50 to 30% by weight, respectively, and the amount of said crosslinking agent used being 0.

Abstract: An impact resistant plastic graft copolymer composition is prepared by1. agglomerating 100 parts by weight in terms of the solids content of a synthetic rubber latex (A) containing small-sized rubber particles by adding 0.1 - 5 parts by weight, in terms of the solids content of a carboxylic acid containing copolymer latex (B) having a pH of at least 4, said copolymer latex being prepared by polymerizing a mixture of monomers comprising 5 - 20% by weight of at least one monomer selected from the group consisting of acrylic acid, methacrylic acid, itaconic acid and crotonic acid and 95-80% by weight of alkyl acrylate having 1 to 12 carbon atoms in the alkyl group, in the presence of at least one anionic emulsifier, and adjusting the pH of the mixed latexes (A) and (B) to not less than 6;2. stabilizing the agglomerated latex with at least one nonionic emulsifier, and3.