Catalytic system for copolymerization of isobutylene/styrene and polymerization process using the same

摘要

There are disclosed a catalytic system for copolymerization of isobutylene and styrene, comprising a dialkylaluminum halide and a co-catalyst, the dialkylaluminum halide being represented by the general formula R¹ R² Al X ( R¹ and R² are each an alkyl group having 1 to 10 carbon atoms or an aralkyl group having 7 to 10 carbon atoms, and X is a halogen atom ), and further a halogenated metal as the case may be; and a process for producing an isobutylene/styrene copolymer which comprises a step of copolymerizing isobutylene and styrene at a temperature in the range of 10°C to 50°C in the presence of the above catalytic system. The catalytic system is capable of industrially producing, in high yield, an isobutylene/styrene copolymer having a relatively low molecular weight which is useful as a resin component for heat-fusible resin compositions, hot-melt adhesives, pressure-sensitive adhesives and the like and as a softening agent for a rubber composition.