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:
Jan. 30, 2001
Filed:
Nov. 30, 1998
Armin Lange, Heidelberg, DE;
Wolfgang Micklitz, Neustadt, DE;
Rainer Karer, Kaiserslautern, DE;
Kaspar Evertz, Schifferstadt, DE;
Shahram Mihan, Ludwigshafen, DE;
Hans-Jacob Feindt, Limburgerhof, DE;
Manfred Hecker, Neustadt, DE;
Peter Bauer, Ludwigshafen, DE;
Philipp Rosendorfer, Neustadt, DE;
BASF Aktiengesellschaft, Ludwigshafen, DE;
Abstract
In a continuous gas-phase polymerization process for preparing ethylene and propene homopolymers and copolymers, in which ethylene, propene or a mixture of ethylene or propene and C,-C,-&agr;-monoolefins is polymerized in the polymerization zone of a gas-phase polymerization reactor at from 30 to 125° C. and a pressure of from 1 to 100 bar in the gas phase in a bed of finely divided polymer in the presence of a catalyst, where the reactor gas is circulated to remove the heat of polymerization, polymer deposits in the circulating gas line are prevented by metering a catalyst poison having a boiling point above the maximum temperature within the circulating gas line into this circulating gas line in at most such an amount that it does not significantly impair the productivity of the catalyst in the reactor.