| 摘要 |
Ethylenically unsaturated hydrocarbons are polymerized in a hydrocarbon medium using as catalyst a dispersion of a compound having the empirical formula AlTi2Cl8 and an alkali metal aluminium hydride, e.g. Li AlH4 or NaAlH4 Monomers specified are styrene, propylene, ethylene, butene, butadiene, isoprene, 3-methyl-1butene, hexene and olefins derived from cracking wax. The compound of empirical formula AlTi2Cl8 may be prepared by heating TiCl4 + Al powder while dispersed in hexane. In an example sodium hydride is also present during the polymerization. Diethyl ether, isopropyl alcohol, hydrochloric acid, water and dilute ammonia are materials used in the purification and fractionation of the polymers obtained. Specification 856,644 is referred to.ALSO:A polymerization catalyst consists of a dispersion of a compound having the empirical formula AlTi2Cl8 and an alkali metal aluminium hydride (e.g. LiAlH4 or NaAlH4) in a hydrocarbon liquid. The compound AlTi2Cl8 may be obtained by heating TiCl4 + Al powder while dispersed in hexane. In an example sodium hydride is also present. Specification 856,644 is referred to.
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