Patent ID: 6162870
Filing Date: 2000-12-19
Classification: C08F

Abstract:
A rubber-modified styrene type polymer comprising from 1 to 15 parts by weight of a dispersed phase made of an elastic material and from 99 to 85 parts by weight of a continuous phase made of a polymer comprising from 35 to 75 wt % of styrene type monomer units and from 65 to 25 wt % of (meth)acrylate type monomer units, wherein the elastic material is a styrene-butadiene block copolymer comprising from 30 to 50 wt % of styrene monomer units and from 70 to 50 wt % of butadiene monomer units, the weight average molecular weight (Mw) of the polystyrene portions of the styrene-butadiene block copolymer is from 45,000 to 75,000, and the ratio (Mw/Mn) of the weight average molecular weight to the number-average molecular weight (Mn) is from 1.20 to 1.80.