C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
400/3029, 402/40
C08F 212/12 (2006.01) C08L 25/16 (2006.01)
Patent
CA 1273147
ABSTRACT OF THE DISCLOSURE A process for producing an .alpha.-alkyl-substituted aromatic vinyl copolymer constituted of 60 to 85 parts by weight of the .alpha.-alkyl-substituted aromatic vinyl monomer, 15 to 35 parts by weight of a vinyl cyanide monomer, and 0 to 40 parts by weight of another vinyl monomer copolymerizable with these monomers, which process is characterized in that all the amount of the aromatic vinyl monomer necessary for the entire polymerization and such partial amounts of the vinyl cyanide monomer and another copolymer- izable vinyl monomer as to give a predetermined copolymer composition with respect to the content of the aromatic vinyl monomer, are first charged and emulsified and the emulsion polymerization is then initiated and carried out by adding dropwise continuously the residual amounts of the vinyl cyanide monomer and another copolymer- izable vinyl monomer in such a manner that the range of change in the content of the aromatic vinyl monomer in the copolymer during the polymerization reaction will not vary more than 2% in the range of conversion of 0 to 90%; and a thermoplastic resin composition comprising [A] 50 to 90% by weight of a copolymer consti- tuted of 60 to 85 parts by weight of an .alpha.-alkyl-substituted aromatic vinyl monomer, 15 to 35 parts by weight of a vinyl cyanide monomer, and 0 to 40 parts by weight of another vinyl monomer copolymerizable with these monomers, the copolymer being produced in such a manner that the range of change in the content of the aromatic vinyl monomer in the copolymer during the polymerization reaction will not vary more than 2% in the range of conversion of 0 to 90, and [B] 10 to 50% by weight of a graft copolymer constituted of 30 to 85 parts by weight of a rubbery polymer and 15 to 70 parts by weight of a grafted poly- mer consisting of a monovinyl aromatic monomer, vinyl cyanide monomer, and another monomer copolymerizable with them in respective proportions of 85-40 :0-40 :0-80, where the total amount of polymers [A] and [B] is 100% by weight.
498335
Kishida Kazuo
Nakata Akira
Toyooka Yutaka
Uchida Makoto
Yamamoto Naoki
Finlayson & Singlehurst
Mitsubishi Rayon Co. Ltd.
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