Patent ID: 7973121
Filing Date: 2011-07-05
Classification: C08G,C08K

Abstract:
1. A process for preparing a polyorganosiloxane containing in its structure at least one functional group, where each functional group is linked to a silicon atom, comprising reacting a polyorganosiloxane containing in its structure at least one hydroxyl group, where each hydroxyl group is linked to at least one silicon atom, with, per silanol unit (≡Si—OH), at least 1 mol of at least one functionalizing polyalkoxysilane of formula: in which: R R R a=0, 1, 2 or 3; b=0 or 1; a+b=0, 1, 2 or 3, with the additional condition according to which when the sum a+b=3, the symbol b cannot be a number equal to 0; wherein said reaction occurs in the presence of an effective amount of a catalyst consisting essentially of a lithium organosilanolate of formula: in which the symbols R 1 , R 2 , R 3 , a and b have the meanings given above; and said process is performed in the absence of an aliphatic alcohol of formula R