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. 31, 2006
Filed:
Mar. 06, 2000
Gianni Collina, Cassana, IT;
Edward Bryan Coughlin, Amherst, MA (US);
Giuliano Cecchin, Ferrara, IT;
Giovanni Baruzzi, Ferrara, IT;
Anna Fait, Ferrara, IT;
Gianni Collina, Cassana, IT;
Edward Bryan Coughlin, Amherst, MA (US);
Giuliano Cecchin, Ferrara, IT;
Giovanni Baruzzi, Ferrara, IT;
Anna Fait, Ferrara, IT;
Basell Polyolefine GmbH, Weselling, DE;
E.I. du Pont de Nemours and Company, Wilmington, DE (US);
Abstract
Multi-stage process for the polymerization of olefins CH═CHR, where R is hydrogen or a C–Calkyl, cycloalkyl or aryl radical, comprising: (I) a first polymerization stage carried out in the presence of a catalyst comprising the product of the reaction between an alkyl-Al compound and a solid component comprising at least one compound of transition metal Mnot containing M-π bonds, thus obtaining a porous polymer, (II) a treatment stage, wherein said porous polymer is contacted with a compound capable of deactivating the catalyst used in stage (I) and with a late transition metal complex; and (III) a second stage of polymerization, carried out in the presence of the product obtained from treatment stage (II).