LOW BROMINE ISOBUTYLENE-CO-4-BROMOMETHYLSTYRENE COMPOSITIONS FOR SEVERE DUTY ELASTOMER APPLICATIONS

摘要

PURPOSE: A vulcanizable mixture consisting essentially of poly(isobutylene-co-4-bromomethylstyrene) and a cure package has low residual benzylic bromine content which leads to enhanced stability under severe duty applications, reduced hot tension set, and reduced adhesion or co-cure to halobutyl tire inner liners. CONSTITUTION: A vulcanizable mixture consisting essentially of poly(isobutylene-co-4-bromomethylstyrene) and a cure package wherein the poly(isobutylene-co-4-bromomethylstyrene) comprises from 0.1 to 0.45 mole percent benzylic bromine. A method for vulcanizing poly(isobutylene-co-4-methylstyrene), comprising the steps of: brominating the poly(isobutylene-co-4-methylstyrene) to obtain a poly(isobutylene-co-4-bromomethylstyrene) containing from 0.1 to 0.45 mole percent benzylic bromine; compounding the poly(isobutylene-co-4-bromomethylstyrene) with a cure package; and heating the compounded mixture to vulcanize the poly(isobutylene-co-4-bromomethylstyrene).