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. 17, 2006
Filed:
Jun. 29, 2004
Maria Silvia Tonti, Ferrara, IT;
Markus Oberhoff, Speyer, DE;
Volker Fraaije, Frankfurt am Main, DE;
Bernd Bachmann, Gross-Gerau/Dorn, DE;
Maria Silvia Tonti, Ferrara, IT;
Markus Oberhoff, Speyer, DE;
Volker Fraaije, Frankfurt am Main, DE;
Bernd Bachmann, Gross-Gerau/Dorn, DE;
Basell Polyolefine GmbH, Wesseling, DE;
Abstract
A process for polymerizing one or more alpha-olefins of formula CH═CHT wherein T is a hydrogen atom or a C–Calkyl radical comprising the following steps: a) contacting in a continuous way one or more of said alpha olefins with a metallocene based catalyst system in a loop reactor, wherein: (i) the reaction is carried out in a liquid medium; (ii) the average residence time of the metallocene-based catalyst system is not more than 30 minutes; (iii) the temperature of the loop ranges from 25° to 70° C.; in order to obtain a polymerization degree ranging from 60 to 500 g per gram of catalyst system; b) feeding in continuous the prepolymerized metallocene-based catalyst system obtained in step a) into a polymerization reactor C) polymerizing one or more alpha-olefins, the same or different from the alpha olefins used in step a), in the presence of said prepolymerized metallocene-based catalyst system.