Process for the preparation of organopolysiloxanes...

Details Process for the preparation of organopolysiloxanes... Process for the preparation of organopolysiloxanes...

C - Chemistry, Metallurgy

08

G

C08G 77/06 (2006.01) C08G 77/08 (2006.01) C08G 77/18 (2006.01) C08G 77/32 (2006.01)

Patent

CA 2141985

A process for the preparation of organopolysiloxanes which contain at least one unit of the formula (R10)3-mRmSiO1/2 in which R is identical or different and is a hydrogen atom or monovalent, optionally substituted hydrocarbon radical, R1 is identical or different and is a monovalent, optionally substituted hydrocarbon radical having 1 to 8 carbon atoms and m is 0, 1 or 2, which comprises, in a 1st step, reacting organosilicon compounds (1) which contain at least one Si-bonded hydroxyl group with at least one silane (2) of the formula (R1O)4-mSiRm and/or partial hydrolysates thereof, in which R, R1 and m have the above mentioned meaning, in the presence of a fluoride salt (3), and, optionally, in a 2nd step, when the reaction has ended, adding component (4) which can bond fluoride ions.

Une opération pour la préparation d'organopolysiloxanes qui contiennent au moins une unité de la formule (R10)3-mRmSiO1/2, où R est identique ou différent et où R est un atome d'hydrogène ou un radical d'hydrocarbure monovalent, optionellement substitué; R1 est identique ou différent et est un radical d'hydrocarbure monovalent, optionellement substitué ayant 1 à 8 atomes de carbone, et où m est 0, 1 ou 2, ce qui comprend, dans une première étape, des composés organosilicones en réaction (1) contenant au moins un groupe d'hydroxyls liés à au moins une silane (2) de la formule (R1O)4-mSiRm et/ou ses hydrolysâts partiels, dans laquelle R, R1 et m ont la signification décrite plus haut, en présence d'un sel de fluorure (3) et, optionellement, lors d'une deuxième étape à la fin de la réaction, l'addition d'un composant (4) susceptible de lier des ions de fluorure.

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