butyl rubber(redirected from Polyisobutene)
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Related to Polyisobutene: Polyisobutylene
A synthetic rubber produced by copolymerization of a butylene with isoprene, nearly impermeable to air and used in tires, inner tubes, and insulation.
(Chemical Engineering) a copolymer of isobutene and isoprene, used in tyres and as a waterproofing material