| 摘要 |
A rubber-modified styrene type polymer comprising from 1 to 15 parts by weight of a dispersed phase made of a rubber-like 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 rubber-like elastic material is a styrene (30 to 50 wt %)-butadiene (70 to 50 wt %) block copolymer, the weight average molecular weight (Mw) of the polystyrene portions of this block copolymer is from 45,000 to 75,000, and the ratio (Mw/Mn) of Mw to the number-average molecular weight (Mn) is from 1.20 to 1.80.
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