Flame retardant graft copolymers of polypropylene
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United States of America Patent
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Dec 31, 1991
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N/A
app pub date -
Feb 22, 1990
filing date -
Feb 22, 1990
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Expired
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Abstract
Described are polypropylene polymer compositions which have suprisingly good physical properties in combination with flame retardancy, which include graft copolymers represented by the formula: ##STR1## wherein n is >1, P is polypropylene, and S is a grafted side chain having brominated monomeric units of the formula: ##STR2## wherein x=1 to 4, R.sub.1 is H or CH.sub.3, and R.sub.2 is H or a C.sub.1-4 lower alkyl group. Polymer blends including such graft copolymers and methods for making flame retardant polymer compositions are also described.
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