| 摘要 |
1,3-Butadiene is polymerized in hexane solution in the presence of a catalyst composition comprising: (a) A hexane-soluble cobalt component; (b) A reducing agent comprising RAlX2 wherein R is a hydrocarbyl radical of 1-8 carbon atoms, and X is halogen; and (c) MgCl2, MgBr2, MnCl2, MnBr2 or a Mg or Mn salt of a carboxylic acid having 12-25 carbon atoms. The cobalt component may be a cobalt salt of a carboxylic acid or thiocarboxylic acid having at least six carbon atoms or a hexane-soluble complex of a cobalt salt with an oxygen-containing or nitrogen-containing group either in the same salt molecule or in a separate compound. Typical aluminum hydride or hydrocarbyl dihalides that may be used are aluminum hydride dichloride, ethyl aluminum dichloride, butyl aluminum dibromide, etc. Butadiene polymers having a high cis-1,4 and low 1,2 contents are obtained in high yield, and it is possible to produce high molecular weight polymers without the gel formation often accompanying such high molecular weight polymers.
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