PRE-POLYMERIZED CATALYST COMPONENTS FOR THE POLYMERIZATION OF OLEFINS

摘要

Catalyst components for the preparation of ethylene (co)polymers capable to produce polymers with high bulk density, to avoid the problems of formation of fines and that have a high activity are provided. Said catalyst components a re characterized by comprising a non-stereospecific solid catalyst component, comprising a titanium compound and a magnesium dihalide, which is pre- polymerized with an alpha olefin CH2=CHRI wherein R is a C1-C8 alkyl group, to such an extent that the amount of the .alpha.-olefin pre-polymer is up to 10 0 g per g of said solid catalyst component.