The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 11, 1996
Filed:
Aug. 05, 1994
James C Chien, Amherst, MA (US);
Marvin D Rausch, Amherst, MA (US);
Solvay (Societe Anonyme), Brussels, BE;
Abstract
A process for the preparation of a polyolefin by polymerization of at least one olefin, the said process comprising contacting the at least one olefin with a catalytic system comprising a metallocene and a cocatalyst, wherein the metallocene is selected from the group consisting of rac-2,2-dimethylpropylidene(1-.eta..sup.5 -cyclopentadienyl)(1-,.eta..sup.5 -fluorenyl)dichlorometallocene of titanium, zirconium, hafnium and vanadium. Syndiotactic polypropylene having a melting temperature T.sub.m from 95.degree. to 160.degree. C., a syndiotactic pentad fraction [rrrr] from 0,91 to 0,96, a crystalline fraction f.sub.C from 25 to 50% and a viscosity-average molecular weight M.sub.v from 60,000 to 200,000.