Block copolymer rubber, resin modifier, and resin composition
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United States of America Patent
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Dec 28, 2004
Grant Date -
Jan 30, 2003
app pub date -
Aug 26, 2002
filing date -
Feb 25, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An aromatic vinyl-conjugated diene block copolymer rubber comprising 50 to 75% by weight of conjugated diene monomer units and 25 to 50% by weight of aromatic vinyl monomer units, wherein the content of vinyl bond in the conjugated diene monomer units is at least 50% by weight, the ratio of blocked aromatic vinyl in the aromatic vinyl monomer units is at least 70% and the number average molecular weight of the copolymer rubber is in the range of 280,000 to 1,000,000. An aromatic vinyl resin having incorporated therein the aromatic vinyl-conjugated dione block copolymer rubber gives a shaped article having good impact resistance and luster, and characterized in that the luster is thermally stable and the luster varies only to a minimized extent within the shaped article.
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