| 摘要 |
PURPOSE:To obtain the titled polymer of outstanding moldability, suitable as a raw material for containers such as bottles, by graft polymerization, in the presence of a conjugated diene synthetic polymer, of a mixture of unsaturated nitrile and another monomer with a molecular weight regulator added to the system at a specified point. CONSTITUTION:First, in the presence of (A) 1-40pts.wt. of a conjugated diene synthetic rubber made from >=50wt.% of conjugated diene monomer and <=50wt.% of a second monomer copolymerizable therewith, (B) 100pts.wt. of a mixture of >=50wt.% of unsaturated nitrile and the rest of a second monomer copolymerizable therewith is brought to graft polymerization in an aqueous medium. Thence, at a point of conversion of the above-mentioned monomer within the range 5-20%, the polymerizer is charged with (C) a molecular weight regulator (pref. limonene dimercaptan) to continue the polymerization, the obtaining the objective polymer. The above polymerization is pref. emulsion polymerization.
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