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US 5,180,787 AGranted
Flame retardant polymer compositions
AssigneeBromine Compounds Ltd.
InventorsLeonard M. Shorr, Theodor M. Fishler, Shaul Yanay, Michael Rumack
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AssigneeBromine Compounds Ltd.
InventorsLeonard M. Shorr, Theodor M. Fishler, Shaul Yanay, Michael Rumack
Estimating the term…
The present invention relates to fire retardant polymer compositions possessing a non-liner structural configuration resulting by the reaction of N-tribromo-phenylmaleimide, with or without comonomer, with a preformed backbone polymer, in which the bromine content is above 1.2% by weight bromine. The polymer is selected from polystyrene, polyolefins, polyamides, rubbers, polyesters, acrylics, polymeric dienes and mixtures or copolymers thereof. The comonomer present with the N-tribromophenyl-maleimide is selected from the group consisting of acrylonitrile, styrene and vinyl chloride. According to the invention the non-linear structural configurations are obtained either by grafting or crosslinking of the N-tribromophenylmaleimide onto the preformed backbone polymer in the presence of free radical producing means. Optionally, synergistic fire retardant additives such as antimony oxide are incorporated in the compositions. The preformed backbone polymer must be no less than 4% by weight of the total resin present in the compositions. The flame retardant polymer compositions have improved properties compared with those obtained with known flame retardant reagents.
Fire retardant polymer compositions comprising non-linear structural configurations consisting essentially of from 2% to 60% by weight of N-tribromophenylmaleimide, or N-tribromophenylmaleimide together with a comonomer selected from the group consisting of an acrylate ester, a methacrylate ester, vinyl acetate, a vinyl halide, a vinylidene halide, acrylonitrile, butadiene, chloroprene, styrene, isobutylene, acrylamide, maleic anhydride and a mixture thereof, directly bonded by means of free-radical initiation to a preformed backbone polymer selected from the group consisting of a polyolefin, a polyamide, a natural rubber, a polyester, an acrylic polymer and a mixture or a copolymer thereof to form a graft polymer containing at least 1.2% by weight bromine in its pendant side chains or crosslinks.
A method for the preparation of a fire retardant polymer composition comprising non-linear structural configuration, comprising the step of directly grafting by free-radical initiation N-tribromophenylmaleimide or N-tribromophenylmaleimide together with a comonomer selected from the group consisting of an acrylate ester, a methacrylate ester, vinyl acetate, a vinyl halide, a vinylidene halide, acrylonitrile, butadiene, chloroprene, styrene, isobutylene, acrylamide, maleic anhydride and a mixture thereof, onto a preformed backbone polymer selected from the group consisting of a polyolefin, a polyamide, a natural rubber, a polyester, an acrylic polymer, and a mixture or copolymer thereof.
Dependencies are inferred from the claim text.