Process for halogenation of isomonoolefin/para-alkylstyrene copo

Details Process for halogenation of isomonoolefin/para-alkylstyrene copo Process for halogenation of isomonoolefin/para-alkylstyrene copo

1996-07-24

1997-09-23

Lipman, Bernard

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

5253334, 525355, C08F 822

Patent

active

056705824

ABSTRACT:
A process for halogenating a copolymer of a C.sub.4 -C.sub.7 isomonoolefin, eg. isobutylene, and a para-alkylsyrene, e.g., para-methylstyrne, is disclosed. Increased halogenation efficiency is achieved by conducting the reaction under free radical halogenation conditions and in the presence of an oxidizing agent, e.g. hydrogen peroxide, which oxidizes hydrogen halide generated in-situ in the reaction back to free halogen. The oxidizing agent is preferably not added to the reaction medium until after first stage halogenation is substantially completed.

REFERENCES:
patent: 3018275 (1962-01-01), Cottle
patent: 5077345 (1991-12-01), Newman et al.
patent: 5162445 (1992-11-01), Powers et al.
patent: 5306740 (1994-04-01), Laas et al.
patent: 5569723 (1996-10-01), Baade et al.

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