High gloss high impact monovinylidene aromatic polymers
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United States of America Patent
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Aug 27, 2002
Grant Date -
N/A
app pub date -
Oct 28, 1999
filing date -
Aug 13, 1997
priority date (Note) -
Expired
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Abstract
The present invention is a rubber modified monovinylidene aromatic polymer having a bimodal particle size distribution comprising: a) rubber particles of a star or branched low viscosity rubber having a volume average particle size of from 0.1 to 2.mu., and a cellular or core shell morphology or mixture thereof, and b) rubber particles of a star or branched low viscosity rubber, linear diene rubber or block copolymer rubber having a volume average particle size of from 0.5 to 10.mu., characterized in that the rubber particles of b) are more dense than the rubber particles of a), having a smaller occluded monovinylidene aromatic polymer content than the particles of a), wherein the particles of a) are from 50 to 99 weight percent of the total diene rubber content
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