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Goodyear Rubber Company of So. California Butyl polymer is a synthetic rubber, a copolymer of isobutylene and isoprene. Polyisobutylene was first developed by BASF in 1931 and it was later developed into butyl rubber in 1937. Halogenated butyl rubber (halobutyl) was developed in 1960s, in its chlorinated (chlorobutyl) and brominated (bromobutyl) variants provide significantly higher curing rates with other rubber. Due to its bulky chemical structure, butyl rubber has excellent impermeability and long segments of polymer chains give flexibility. Due to its unique characteristics the first major application was tire inner tubes, remains an important marker segment even today. Butyl rubber is highly used in high temperature applications as well.