butyl rubber

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A type of synthetic rubber obtained by copolymerizing 2-methylpropene (CH2:C(CH3)CH3; isobutylene) and methylbuta-1,3-diene (CH2:C(CH3)CH:CH2, isoprene). Only small amounts of isoprene (about 2 mole %) are used. The rubber can be vulcanized. Large amounts were once used for tyre inner tubes.

Subjects: Chemistry.

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