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US 6,635,734 B2Granted
Catalyst system to produce highly crystalline polypropylene
AssigneeFina Technology, Inc.
InventorsEdwar S. Shamshoum, Sehyun Kim
Life of this patent
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Abstract
The present invention provides polypropylene having xylene solubles from 0.6 to 1.5 weight percent and isotacticity equal to or greater than about 98.0 percent. The polypropylene is obtained by contacting propylene monomer under suitable polymerization conditions with (a) a Ziegler-Natta catalyst, (b) a co-catalyst, and (c) an electron donor.
Claims18
Polypropylene comprising xylene solubles from 0.6 to 1.5 weight percent and isotacticity equal to or greater than about 98.0 percent.
A process for making polypropylene, comprising contacting propylene monomer under suitable polymerization conditions with:
- (a) a Ziegler-Natta catalyst;
- (b) a co-catalyst;
- and
- (c) an electron donor,
- wherein the polypropylene comprises xylene solubles from 0.6 to 1.5 weight percent and isotacticity equal to or greater than about 98.0 percent.
2 more elements
Dependencies are inferred from the claim text.