Saytech, Inc.

Joseph M Lesniewski

Henry J Barda

Michael J Breza

A flame retardant polymer composition comprising 2,3-dimethyl-2,3-diphenylbutane, a halogenated bisimide corresponding to the formula: ##STR1## wherein Q is methylene or oxygen, X is chlorine or bromine, R is hydrogen or an alkyl group containing 1-5 carbon atoms, R' is hydrogen or methyl and R' is an organic group containing 1-15 carbon atoms, and a polypropylene polymer selected from the group consisting of polypropylene and copolymers containing at least 50% by weight of co-polymerized propylene monomer.

Self-extinguishing propylene polymer

A flame retardant thermoplastic polymer containing a flame retardant amount of a flame retardant additive mixture. The mixture is comprised of halogenated imide-containing polyols having the formula: ##STR1## and the corresponding ethers having the formula: ##STR2## wherein R is a hydrocarbon group having the valence n+2 and is selected from the group consisting of benzene groups, naphthalene groups and alicyclic hydrocarbon groups containing 5 to 10 carbon atoms, X is selected from the group consisting of bromine and chlorine, n is an integer from 1-6 and p is an integer from 2-6. The preferred flame retardant mixture is a derivative of tetrabromophthalic anhydride.

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Hopewell, NJ, United States of America

Joseph M Lesniewski