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. 04, 2001
Filed:
Jul. 23, 2000
Christelle Delaite, Lyons, FR;
Thierry Hamaide, Vienne, FR;
Roger Spitz, Lyons, FR;
Karine Tortosa, Villeurbanne, FR;
Rhodia Chimie, Boulogne Billancourt, Cedex, FR;
Abstract
The invention relates to a composition based on a grafted metal oxide, its preparation and its use in a process of polymerization by opening oxygenated rings such as alkyl oxides, cyclic esters or cyclic carbonates. The composition comprises a support chosen from the group of metal oxides capable of containing hydroxyl functions, onto which is grafted a group of formula (1) —M(OR),in which M is an element chosen from scandium, zirconium, hafnium, niobium, tantalum, rare-earth metals and actinides, R is an organic group and n is an integer greater than or equal to 1. The composition is prepared by forming a suspension of the abovementioned support and then placing in contact and reacting this suspension with a compound of formula (2) M(OR),in which M, R and n are defined as above.