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OwnerYoshinori Takeda, Tomoyuki Yoshimi +2inventors
InventorsYoshinori Takeda, Tomoyuki Yoshimi, Shun Wachi, Kuniyoshi Matsuba
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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.
A powdery resin composition 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.
A process for preparing a powdery resin composition comprising the steps of coagulating a graft copolymer latex obtained by emulsion polymerization of a vinyl monomer using a higher fatty acid salt in the presence of a rubber to give a slurry, adding to 100 parts by weight (solid basis) of said slurry 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, and recovering a powder from the resulting mixture.
Dependencies are inferred from the claim text.