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:
Oct. 16, 2007
Filed:
Jun. 22, 2005
Steven Gray, Houston, TX (US);
Henry Enriquez, Pearland, TX (US);
David Knoeppel, League City, TX (US);
Steven Gray, Houston, TX (US);
Henry Enriquez, Pearland, TX (US);
David Knoeppel, League City, TX (US);
Fina Technology, Inc., Houston, TX (US);
Abstract
Polyolefins may be prepared using a cocatalyst conforming to the formula:AIR(X)Lwherein Ris a linear or branched organic moiety having at least 5 carbons and Xis a linear or branched organic moiety having at least 5 carbons or a heterocyclic moiety having at least 4 atoms and can be anionic or di-anionic. The aluminum complex may also be in the form of an adduct complex where Lis a Lewis base and m=1-3. The cocatalyst Rcomponents are selected such that they do not react with water under polymerization conditions to form a species that is highly soluble in the polymerization diluent. Use of the specified cocatalyst reduces fouling during metallocene-catalyzed runs and 'post-metallocene hangover' when the same production equipment is transitioned to non-metallocene catalyst runs using catalysts such as chromium.