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:
Jul. 22, 2003
Filed:
Apr. 02, 2002
Applicant:
Inventors:
Michael Witt, Rotorua, NZ;
Andreas Deckers, Flomborn, DE;
Farid Rizk, Neuhofen, DE;
Kaspar Evertz, Schifferstadt, DE;
Assignee:
Basell Polyolefine GmbH, , DE;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C08F 2/34 ;
U.S. Cl.
CPC ...
C08F 2/34 ;
Abstract
The invention relates to a method and an apparatus for the polymerization of gaseous olefins, in particular of ethylene and at least one &agr;-olefin, in the gas phase in a stirred or fluidized, catalyst-containing polymerization zone ( ) and at least one decompression zone ( ) downstream of the polymerization zone ( ). The mixture of solid (co)polymer and unreacted monomers leaving the polymerization zone ( ) flows through a settling zone, in particular in the form of a settling leg ( ), before the decompression zone.