Abstract: A powdery resin composition having excellent ordinary temperature and low temperature powder characteristics, in particular, excellent blocking resistance, and comprising 100 parts by weight of a graft copolymer which contains a rubber as a trunk polymer and which is obtained by emulsion polymerization using a higher fatty acid salt, 0.1 to 10 parts by weight of a crosslinked polymer of 30 to 60% by weight of methyl methacrylate, 65 to 35% by weight of an aromatic vinyl monomer, 0.1 to 25% by weight of a crosslinking monomer and 0 to 30% by weight of other copolymerizable monomer, and 0.1 to 10 parts by weight of a lubricant. According to the present invention, powder characteristics in low temperature storage of conventional graft copolymers containing a large amount of a rubber, which have been used as impact modifier for vinyl chloride resins, can be remarkably improved.

Abstract: A vinyl chloride resin composition including: (1) 100 parts by weight of a vinyl chloride resin and (2) 0.1 to 30 parts by weight of a two-stage polymer, said polymer (2) being prepared by emulsion-polymerizing 60 to 95 parts by weight of a monomer mixture (A) of 50 to 95% by weight of methyl methacrylate, 5 to 50% by weight of an alkyl methacrylate with a C.sub.2 to C.sub.8 alkyl group and 0 to 20% by weight of a vinyl monomer to give a polymer latex and then polymerizing 40 to 5 parts by weight of a monomer mixture (B) of 20 to 80% by weight of an alkyl acrylate and/or an alkyl methacrylate other than methyl methacrylate, 80 to 20% by weight of methyl methacrylate and 0 to 20% by weight of a vinyl monomer in the presence of said polymer latex, said polymer (2) having a particle size of not more than 1000 .ANG. in the latex, and a specific viscosity at 30.degree. C. of the solution wherein 0.4 g of said polymer (2) is dissolved in 100 ml of benzene of 1 or more.