Process for preparing polyolefins with broad molecular-weight distribution.

摘要

A process for preparing polyolefins having a broad molecular-weight distribution with high stereoregularity and crystallinity. The process is adapted to polymerize olefins in the presence of a high activity catalyst. The process does not employ such a multi-stage polymerization method as employed in the prior art or two types of organic silicon compounds as in the prior art but uses only one selected from organic silicon compounds specified by a general formula Si(C6H11)2(OR)2 wherein C6H11 is a cyclohexyl group and R is an alkyl group with 1 to 5 carbon atoms.