METHOD FOR PREPARATION OF COPOLYMERS OF ISOBUTYLENE, WHICH CONTAIN UNSATURATIONS AND REACTIVE HALOGEN ATOMS

摘要

CASE 991 METHOD FOR THE PREPARATION OF COPOLYMERS OF ISOBUTYLENE WHICH CONTAIN UNSATURATIONS AND REACTIVE HALOGEN ATOMS. Vulcanizable copolymers of isobutylene with linear trienes are prepared by halogenation of a previously prepared isobutylene-triene copolymer, The reaction is carried out preferably at subzero temperatures and in the dark due to the high reactivity of certain halogenating agents: among these, even Haloid acids can be used, that which was impossible with the prior art procedures. The novel halogenated copolymers have a better behaviour when sulphur cured than the conventional chlorobutyl rubbers.