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US 11,926,690 B2Granted
Precursors and catalyst components for the polymerization of olefins
AssigneeBasell Poliolefine Italia S.r.l.
InventorDiego Brita
Life of this patent
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Abstract
A Ziegler-Natta catalyst component precursor made from or containing a mechanical mixture of (a) distinct particles of adducts of formula MgCl2(R1OH)n where R is a C1-C8 alkyl group and n is from 0.2 to 6 having average particle size (P50a) ranging from 5 to 100 μm; and (b) from 0.2 to 5.0% by weight of distinct particles of a solid compound containing more than 50% by weight of Sift units and having average particle size (P50b), wherein the ratio P50b/P50a ranges from 0.4 to 1.5.
Claims15
A Ziegler-Natta catalyst component precursor comprising:
- a mechanical mixture of
- (a) distinct particles of adducts of formula MgCl2(R1OH)n where R1 is a C1-C8 alkyl group, and n is from 0.2 to 6 having average particle size (P50a) ranging from 5 to 100 μm and
- (b) from 0.2 to 5.0% by weight, based on the total weight of mixture (a)+(b), of distinct particles of a solid compound containing more than 50% by weight of SiO2 units and having average particle size (P50b),
- wherein the ratio P50b/P50a ranges from 0.4 to 1.5.
1 more element
Dependencies are inferred from the claim text.