Manufacture of brominated polymerization products of styrene

Details Manufacture of brominated polymerization products of styrene Manufacture of brominated polymerization products of styrene

C - Chemistry, Metallurgy

08

F

402/573, 400/941

C08F 8/22 (2006.01) C08F 12/08 (2006.01) C08K 5/52 (2006.01) C08L 25/04 (2006.01) C08L 101/00 (2006.01)

Patent

CA 1095647

ABSTRACT OF THE DISCLOSURE: Styrene polymers or copolymers containing bromine are manufactured by cationic polymerization of the monomer, or of the monomer plus a copolymerizable monomer of the isobutylene or nuclear-alkylated styrene type, in an organic solvent is the presence of a Lewis acid catalyst to a mean molecular weight (number average) of from 800 to 8,000 for the polymerization product. Bromine is then added to the solution without first working up to the latter. The catalyst used for the bromination is the same as that used for the polymerization. If necessary, fresh catalyst may be added before the bromination. After completion of the bromination, the reaction solution is extracted with water until it is bromide-free, and the solvent, generally a halohydrocarbon, is then stripped off. Products containing up to about 80% by weight of bromine may be obtained. They have a pale yellowish color and exhibit no significant decomposition up to 340°C. They may be used as flame-proofing agents for thermoplastics.

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