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:
Feb. 27, 2001
Filed:
Sep. 22, 1999
Applicant:
Inventor:
Leonard V. Cribbs, Hamilton, OH (US);
Assignee:
Equistar Chemicals, L.P., Houston, TX (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C08F 4/44 ; C08F 2/04 ;
U.S. Cl.
CPC ...
C08F 4/44 ; C08F 2/04 ;
Abstract
A two-step olefin polymerization process is disclosed. A single-site catalyst precursor reacts with a boron-containing activator and a first olefin substantially in the absence of an alumoxane to produce a stable, prepolymer complex, which is then used to polymerize a second olefin in the presence of a scavenging amount of an alumoxane. The process gives high molecular weight polyolefins with low residual aluminum contents. Boron-containing activators can be used, even at reaction temperatures greater than 100° C., while maintaining high catalyst activity.