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:
Jul. 06, 2010
Filed:
Jan. 26, 2004
Lucile Gambut-garel, Lyons, FR;
José-louis Roca-ortega, Lyons, FR;
Didier Dahler, Tassin la Demi-Lune, FR;
Gérard Mignani, Lyons, FR;
Christian Allandrieu, Villeurbanne, FR;
Lucile Gambut-Garel, Lyons, FR;
José-Louis Roca-Ortega, Lyons, FR;
Didier Dahler, Tassin la Demi-Lune, FR;
Gérard Mignani, Lyons, FR;
Christian Allandrieu, Villeurbanne, FR;
Bluestar Silicones France, Lyons, FR;
Abstract
The invention relates to the field of silicon resins, particularly polymethylvinylsiloxane resins. The invention more specifically relates to a method for the production of polymethylvinylsiloxane resins comprising at least two different types of siloxy motifs RSiO(motif M) and SiO(motif Q, optionally Q), said method comprising the following steps: a) producing a siloxane resin comprising motifs Q by acidic hydrolysis of a siloxane resin precursor, preferably an alkaline silicate; b) functionalizing the siloxane resin obtained in step a) with halogenosilanes in the presence of an apolar solvent, the functionalizing generating sub-products including volatile oligosiloxanes (silox); c) recovering silox produced in step b) in a solution in the apolar solvent; and d) subjecting the resin functionalized in step b) to rearrangement with the aid of a strong base in order to eliminate the silanols, wherein at least a part of the silox produced during step b) and recovered in step c) is recycled.