Pre-polymerized catalyst components for the polymerization of olefins
AssigneeBasell Polyolefine GmbH
InventorsMario Sacchetti, Diego Brita, Gianni Collina
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Abstract
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 α-olefin pre-polymer is up to 100 g per g of said solid catalyst component.
Claims19
A pre-polymerized catalyst component for the polymerization of ethylene optionally in mixtures with olefins CH2═CHR, wherein R is a C1–C12 alkyl group, comprising a non-stereospecific solid catalyst component, comprising Ti, Mg and a halogen, which is pre-polymerized with an α-olefin CH2═CHRI wherein R1 is a C1–C8 alkyl group, and the amount of the α-olefin pre-polymer is less than 15 g per g of said solid catalyst component.
A process for the (co)polymerization of ethylene characterized in that it is carried out in the presence of a catalyst comprising (A) a pre-polymerized catalyst component comprising a non-stereospecific solid catalyst component, comprising Ti, Mg and a halogen, which is pre-polymerized with an α-olefin CH2═CHR1 wherein RI is a C1–C8 alkyl group, and the amount of the α-olefin pre-polymer is less than 15 g per g of said solid catalyst component;
- and (B) an Al-alkyl compound.
Dependencies are inferred from the claim text.