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US 4,397,972 AGranted
Flame retardant polystyrene and poly(para-methylstyrene) compositions containing octahalobiphthalyl
AssigneeMobil Oil Corporation
InventorBruce A. Marien
Life of this patent
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Abstract
Flame retarded compositions of styrene or para-methylstyrene polymers and containing octahalobiphthalyl, such as octabromobiphthalyl, and inorganic flame retardant, such as antimony trioxide.
Claims11
A flame-retarded composition comprising:
- a. a polymer or copolymer containing at least 50 weight percent of polymerized styrene;
- or methylstyrene isomers consisting essentially of 0-0.1 percent by weight ortho-methylstyrene, 0-15 percent by weight meta-methylstyrene, and at least 85 percent by weight para-methylstyrene;
- b. an inorganic flame retardant;
- and
- c. octahalogenated biphthalyl.
2 more elements
Dependencies are inferred from the claim text.