Great Lakes Chemical Corporation

Donna L Collison

Nicolai A Favstritsky

Enrico J Termine

Ray W Atwell

Harry A Hodgen

Described are polypropylene molding compositions which have surprisingly good physical properties in combination with flame retardancy, which include copolymers represented by the formula: ##STR1## wherein n is &gt;1, P is isotactic or syndiotactic 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 such flame retardant polymer compositions are also described.

Flame retardant polypropylene molding compositions

Flame retardant hot melt adhesives include atactic polypropylene having grafted thereon a ring-halogenated styrene. The compositions may also include homopolymers of the styrene monomer or equivalents, as well as non-halogenated atactic polypropylene. Tackifying agents, waxes, anti-oxidants and other additives may also be included.

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Lafayette, IN, United States of America

Donna L Collison