| 摘要 |
PURPOSE:To enable pretreatment of a highly active transition metal catalyst without lowering the performance, by using a hydrocarbon solvent having a content of specific chlorinated ethers lower than a specific level. CONSTITUTION:A transition metal catalyst produced by supporting a titanium compound on a magnesium compound is treated with a small amount of an olefin in an inert hydrocarbon solvent and then used in the bulk polymerization or vapor-phase polymerization of olefin essentially in the absence of the inert hydrocarbon solvent. In the above process, the transition metal catalyst is pretreated with an inert hydrocarbon solvent (e.g., heptane) containing <=10ppm of chlorinated ethers of formula (R<1> is hydrocarbon group). |
