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:
Dec. 06, 2011
Filed:
Oct. 31, 2006
Julien Thuilliez, Clermont-Ferrand, FR;
Christophe Boisson, Tramoyes, FR;
Roger Spitz, Lyons, FR;
Michelin Recherche et Technique S.A, Granges-Paccot, CH;
Total Petrochemicals France, Puteaux, FR;
Centre National de la Recherche Scientifique, Paris, FR;
Ecole Superieure de Chimie-Physique-Electronique de Lyon (CPE), Villeurbanne, FR;
Abstract
A borohydride metallocene complex of a lanthanide, its process of preparation, a catalytic system incorporating a borohydride metallocene complex and a process for the copolymerization of olefins employing this catalytic system. Such a complex corresponds to one or other of the following formulae A and B: where, in the formula A, two ligands Cpand Cp, each composed of a cyclopentadienyl group, are connected to the lanthanide Ln, such as Nd, and where, in the formula B, a ligand molecule, composed of two cyclopentadienyl groups Cpand Cpwhich are connected to one another via a bridge P of formula MRR, where M is an element from group IVa, such as Si, and where Rand R, which are identical or different, represent an alkyl group comprising from 1 to 20 carbon atoms, is connected to the lanthanide Ln, where L represents an alkali metal, such as Li, where N represents a molecule of a complexing solvent, such as THF, where x is an integral or non-integral number greater than 0, where p is an integer equal to or greater than 1 and where y is an integer which is equal to or greater than 0.