| 摘要 |
A polymerization catalyst for dienes, comprising the reaction product in an organic solvent of (a) at least one organic solvent soluble organo-aluminium dihalide and (b) at least one organic solvent soluble organic compound of vanadium, in which (a) and (b) are reacted in such quantities so as to provide a gram atomic weight ratio of aluminium to a (b) metal of at least 6: 1. The (a) compound exemplified is ethyl aluminium dichloride, and the (b) compound is vanadium triacetylacetonate. Compound (a) may be formed in situ, and if desired the whole catalyst. The polymerization is preferably effected in a hydrocarbon solvent. A similar solvent is used for the preparation of the catalyst. Dienes mentioned are butadiene-1,3-cyclopentadiene, and cyclohexadiene. The polymerization is effected using conventional "low-pressure" techniques and the polymer recovered by known methods, e.g. addition of pure methanol.
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