| 摘要 |
PURPOSE:To obtain the titled composition of good balance between impact resistance and processability, by polymerization of a mixture of an unsaturated nitrile monomer and unsaturated carboxylic ester in a specified graft rate in the presence of a conjugated diene rubbery polymer. CONSTITUTION:The objective composition can be obtained by polymerization, in the presence of (A) 1-30pts.wt. of a conjugated diene rubbery polymer, of 100pts.wt. of a monomer mixture made up of (B) an unsaturated nitrile monomer [pref. (meth)acrylonitrile], (C) an unsaturated carboxylic ester (pref., ethyl acrylate) and (D) another monomer copolymerizable therewith in an aqueous medium so that the graft rate of said monomer mixture to the component A fall between 70% and 100%. The conjugated diene monomer constituting the component A is pref. 1,3-butadiene.
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