Polymer bound flame retardants
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United States of America Patent
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Aug 6, 1991
Grant Date -
N/A
app pub date -
Nov 7, 1988
filing date -
Nov 7, 1988
priority date (Note) -
Expired
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Abstract
Polymeric flame retardants comprise halognenated aromatic compounds having acylamino functional groups which are chemically bonded to cyclic imide-containing or imide-forming polymers or copolymers. The polymeric flame retardants are prepared by the reaction of halogenated aromatics containing a reactive hydroazido group with some or all of the anhydride groups of an cyclic alpha, beta-unsaturated dicarboxylic acid anhydride polymer or copolymer to form pendant halogenated-aromatic-substituted imide or amic acid groups. In addition, polymeric flame retardants are used to render thermoplastic resin less flammable under conditions which promote combustion. Novel flame retardant hydrazides are disclosed.
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