Process for producing polysiloxanes and use of the same

C - Chemistry – Metallurgy – 08 – G

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C08G 77/08 (2006.01) C08G 77/00 (2006.01)

Patent

CA 2505970

A process for the preparation of an organosilicon condensate which comprises reacting together (A) at least one silicon containing compound having at least one silanol group; and (B) at least one silicon containing compound having at least one -OR group in the presence of (C) a calcium or magnesium catalyst selected to allow the reaction to proceed and (D) at least one solvent. Advantageous catalysts include calcium hydroxide, calcium oxide, magnesium hydroxide or magnesium oxide. Advantageously the solvent may be a protic solvent such as water, methanol, ethanol, 1-propanol, 2-propanol, 1-butanol and 2-butanol. The invention also relates to condensates, such as siloxanes, prepared by the process.

L'invention concerne un procédé permettant de préparer un condensat organosilicié, lequel procédé consiste à faire réagir ensemble (A) au moins un composé à teneur en silicium présentant au moins un groupe silanol; et (B) au moins un composé à teneur en silicium présentant au moins un groupe -OR en présence (C) d'un catalyseur (C) de calcium ou de magnésium choisi de manière à permettre le déclenchement de la réaction et (D) au moins un solvant. Des catalyseurs avantageux comprennent de l'hydroxyde de calcium, de l'oxyde de calcium, de l'hydroxyde de magnésium ou de l'oxyde de magnésium. De manière avantageuse, le solvant peut être un solvant protique, tel que de l'eau, du méthanol, de l'éthanol, du 1-propanol, du 2-propanol, du 1-butanol et du 2-butanol. La présente invention concerne également des condensats, tels que les siloxanes, préparés selon le mode de réalisation décrit dans cette invention.

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