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:
Sep. 04, 2001
Filed:
Jan. 11, 1999
Applicant:
Inventors:
Vidar Almquist, Porsgrunn, NO;
Tone Aastad, Stathelle, NO;
Ingrid Sorum Melaaen, Skjelsvik, NO;
Harri Hokkanen, Helsinki, FI;
Kalle Kallio, Gammelby, FI;
Assignee:
Borealis A/S, Lyngby, DK;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C08F 2/38 ; C08F 4/16 ; C08F 4/22 ;
U.S. Cl.
CPC ...
C08F 2/38 ; C08F 4/16 ; C08F 4/22 ;
Abstract
A method for transitioning between two different catalysts in olefin polymerizations, a first catalyst and a second catalyst, comprising the steps of: discontinuing the feed of the first catalyst into the polymerization reactor, and introducing the second catalyst into the reactor, wherein the transition is performed between a chromium-based catalyst and a metallocene catalyst.