Chlorosulfonated elastomers and methods for making the same

摘要

A vulcanizable polymer is prepared by chlorosulphonating a linear polymer of an alpha-olefin which contains from 4 to 6 carbon atoms in solution in a chlorinated solvent to a sulphur content of from 6.3 to 3 per cent by weight and a chlorine content of from 2 to 10 per cent when the polymer is amorphous and 2-20 per cent when the polymer is at least partially crystalline. Specified polymers are those of alpha-butene, alpha-pentene and alphahexene. The polymer may be dissolved in carbon tetrachloride and chlorosulphonated by reaction with chlorine and sulphur dioxide or by reaction with sulphuryl chloride in the presence of a chlorosulphonation catalyst such as pyridine. The chlorosulphonated polymer may be vulcanized. Specification 810,023 is referred to.