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AssigneeKureha Kagaku Kogyo Kabushiki Kaisha
InventorsHaruhiko Yusa, Masanori Oota, Katumi Suzuki
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A process for producing a graft-polymer comprises adding an aqueous solution of a salt of a strong acid and a monovalent strong base, which solution has been adjusted to a pH value of 8 to 13, to a rubber latex containing diene rubber particles and a fatty acid soap as an emulsifying agent to coagulate the above mentioned rubber particles, and thereafter adding a vinyl monomer to the latex containing the coagulated rubber particles to graft-polymerize the vinyl monomer. According to this process, the formation of rubber masses and macroparticles during the coagulation is reduced and a rubber latex containing rubber particles having a narrow range of particle size distribution is obtained. When a graft-copolymer obtained by using the latex is blended with thermoplastic resins such as vinyl chloride resins, the impact resistance of the thermoplastic resins can be remarkably improved without impairing their transparency and gloss.
A process for preparing a thermoplastic resin composition having an improved impact resistance which comprises blending 100 parts by weight of a thermoplastic resin selected from the group consisting of vinyl chloride resins, styrene-methyl methcrylate copolymer resins and styrene-acrylonitrile resins and 1 to 50 parts by weight of a graft-copolymer obtained by a process which comprises adding an aqueous solution of a salt of a strong acid and a monovalent strong base, which solution has been adjusted to a pH value of 8 to 13, to a rubber latex containing diene rubber particles, said latex having a pH of 8.0-10.0 and said diene rubber therein comprising at least 50% butadiene, and a fatty acid soap as an emulsifying agent to coagulate the rubber particles and thereafter adding a vinyl monomer selected from the group consisting of alkyl methacrylates, aromatic vinyl monomers, acrylonitrile, and alkyl acrylates to the latex containing the coagulated rubber particles to graft-polymerize the vinyl monomer.
Dependencies are inferred from the claim text.