| 摘要 |
The catalyst system disclosed herein comprises one suitable for the polymerization of a conjugated diene, which system comprises a trihydrocarbyl aluminum compound, in which the hydrocarbyl group is an alkyl, aryl or cycloalkyl radical of 1-10 carbon atoms, and an alkali metal compound of the formula M-Y-R wherein M represents Li, Na or K; Y represents O, S or NR1; R represents H or a hydrocarbyl group of 1-10 carbon atoms; R1 represents a hydrocarbyl group of 1-10 carbon atoms, an acyl group of 1-10 carbon atoms; and when Y is NR1 the R and R1 can represent divalent groups so that together they form, with the N, a cyclic radical such as piperdyl, morpholino or diethylene diamino. Lithium alkoxides are preferred forms of the MYR formula and Al(CH3)3 and Al(C2H5)3 are preferred aluminum components.
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