\▐ī-sō-▐byü-▐tān\ n [ISV] (1876) (isobutylene, 2-methylpropene) (CH3)2C = CH2. A colorless, highly volatile liquid or liquidified gas derived from petroleum, easily polymerized to form polybutene. It has a bp of −6.9°C; a fp of −139°C, a flp of −105°C, and sp gr of 0.6 (20°C). Uses: Production of isooctane, butyl rubber, Polyisobutene resins, tert-butanol, methacrylates, copolymer resins with butadiene, and acrylonitrile.
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