Rubber-modified resin blends
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United States of America Patent
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Feb 27, 1990
Issued Date -
N/A
app pub date -
May 30, 1989
filing date -
Apr 8, 1988
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An impact resistant polymeric composition and a process for its production. The composition comprises a rigid polymeric matrix comprising an anionically polymerized copolymer of at least one isopropenyl aromatic monomer and at least one vinyl aromatic monomer, said matrix having dispersed therein an elastomeric phase comprising at least one moderately cross-linked ungrafted rubber and at least one moderately cross-linked lightly-grafted rubber, wherein the lightly-grafted rubber has a graft-to-rubber ratio of 0.9:1 or less. The elastomeric phase is melt agglomerated to provide aggregates having particle sizes in the range from 3,000 to 100,000.
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