Olefin polymerization ziegler-natta catalyst components andprocess for the production of olefin polymers therewith
AssigneeFormosa Plastics Corporation, U.S.A.
InventorsLei ZHANG, Gapgoung KONG, Chih-Jian CHEN, Guangxue XU
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Abstract
The present invention relates to a solid Ziegler-Natta catalyst component for olefin polymerization containing an organosilicon element in combination with one or more internal electron donors. The catalyst components, according to the present invention, are able to produce polypropylene polymers with higher stereo-regularity. The present invention also provides a phthalate-free catalyst system capable of producing polypropylene with an isotacticity that is equal to or higher than catalyst systems containing phthalate derivatives.
Claims13
A solid catalyst component for the polymerization or co-polymerization of alpha-olefins comprising:
- titanium, magnesium, halogen, one or more internal electron donors, and one or more Si—N-bond-containing organosilicon compounds selected from the compound represented by the formula:
- RmSi(NR1R2)n(XR3)(4−m−n) [Formula I]
- wherein R, R1, R2 and R3, which may be identical or different, are independently hydrogen, an aliphatic hydrocarbon group having 1 to 20 carbon atoms, an alicyclic hydrocarbon group having 3-20 carbon atoms, an aromatic hydrocarbon group having 6-20 carbon atoms, or a hydrocarbon group of 1 to 20 carbon atoms containing one or more hetero-atoms selected from the group consisting of N, O, S, Si, B, P, and halogen atoms;
- wherein X is O or S;
- wherein m is 0-3, n is 1-4, and m+n is 1-4;
- wherein when m>1, R's may be identical or different;
- wherein when n>1, R1's and R2's may be identical or different;
- wherein when (4−m−n)>1, (XR3)'s may be identical or different.
Dependencies are inferred from the claim text.