COARSE GRAINED POLYOLEFIN, PRODUCTION THEREOF AND A PROCATALYST CONTAINING A TRANSESTERIFICATION PRODUCT BETWEEN A LOWER ALCOHOL AND DIOCTYLPHTHALATE USED THEREFORE

摘要

The invention relates to a method for preparing polyolefins. In the polymerization, a procatalyst composition is being used, which has been prepared by contacting MgCl2, a lower alcohol, a titanium compound and a phthalic acid ester. The polyolefin is given the adequate coarseness by using a procatalyst of the said type, which has been prepared by carrying out a transesterification between the lower alcohol and the phthalic acid ester and by selecting dioctyl phthalate (DOP) as phthalic acid ester.