Transparent heat-resistant styrene-base copolymer.

摘要

A transparent heat-resistant styrene-base copolymer comprising specific amounts of units derived respectively from (a) a styrene-type monomer, (b) a (meth)acrylonitrile monomer and/or (meth)acrylic ester type monomer and (c) a phenylmaleimide monomer, in which the weight ratio (b)/(c) and the ratio of the weight average molecular weight to the number average molecular weight fall within their respective specific ranges and the amount of the phenylmaleimide-type monomer still remaining in the copolymer is below a certain specific concentration.