Abstract: A thermoplastic resin composition consisting essentially of homopolymer or copolymer of polyvinyl chloride and a graft copolymer of a monomer mixture consisting essentially of alkyl methacrylate, aromatic vinyl compound, unsaturated nitrile and monovinylidene compound copolymerizable therewith, grafted to an aqueous elastomeric dispersion of alkyl acrylate, or a mixture of alkyl acrylate and mono vinylidene compound and a multi-functional cross-linking agent and of which the particles are agglomerated before or during the graft polymerization process, and process of manufacturing the same.

Abstract: A vinyl chloride resin composition consisting essentially of a vinyl chloride polymer or copolymer of 70% or more by weight vinyl chloride and 30% or less by weight of one or more monomers copolymerizable therewith and a graft copolymer prepared by graft copolymerizing one or more monomers selected from alkyl methacrylate, vinyl aromatic compound and unsaturated nitrile, in the presence of an aqueous dispersion of alkyl acrylate elastomer obtained by copolymerizing an allyl ester of vinyl or vinylidene unsaturated alpha-carboxylic acid and alkyl acrylate.

Abstract: A thermoplastic resin composition of vinyl chloride polymer improved in impact strength and weather resistance, which comprises (1) 30 to 97 parts by weight of at least one of vinyl chloride polymers having not less than 70% by weight of vinyl chloride units and (2) 70 to 3 parts by weight of at least one of graft copolymers comprising (2-1) a backbone polymer and (2-2) monomers grafted in two stages thereon in a proportion of 20 : 80 to 80 : 20 by weight, the backbone polymer comprising (2-1-1) units of at least one of alkyl acrylates, of which not more than 20% by weight may be substituted with units of at least one of monovinylic monomers copolymerizable therewith, and (2-1-2) units of at least one of cross-linkable monomers in an amount of 0.

Abstract: A two stage emulsion polymerization process for preparing resins having both weather resistance and impact resistance. In the first step, there are copolymerized 100 to 80% by weight of an alkyl acrylate having alkyl containing 2 to 8 carbon atoms; 0 to 20% by weight of a monomer containing a vinylidene group copolymerizable therewith and cross-linking monomer to produce an aqueous dispersion of cross-linked copolymer having degree of swelling above 10, gel content above 80% and average particle size of 0.15 to 0.5 microns. Emulsifier in an amount of 0.05 to 1 % by weight is used. In the second step, 5 to 50 parts by weight of the solid copolymer of the cross-linked polymer of step 1 is polymerized in the presence of 50 to 95 parts by weight of a monomer mixture of at least 50% by weight of aromatic vinyl monomer and less than 50% by weight of vinyl monomer copolymerizable therewith.