componente catalìtico pré-polimerizado para a polimerização de etileno, bem como referido processo para a (co)polimerização de etileno

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 are 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-CHR1 wherein R is a C1-C8 alkyl group, to such an extent that the amount of the alpha-olefin pre-polymer is up to 100 g per g of said solid catalyst component.