Process for producing polysiloxanes and use of the same
AssigneeRPO Pty Limited
InventorsCongji Zha, Dax Kukulj
Life of this patent
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Abstract
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.
Claims53
A process for the preparation of an organo-silicon 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 wherein R represents an alkyl group having from 1 to 8 carbon atoms, or an alkoxyalkyl group having from 2 to 8 carbon atoms in the presence of
- (C) a calcium or magnesium catalyst selected to allow the reaction to proceed wherein the calcium or magnesium catalyst is not calcium carbonate, calcium phosphate or magnesium carbonate;
- and
- (D) at least one protic solvent.
A process for the preparation of an organosilicon condensation product which comprises condensing at least one silicon containing compound having
- (a) at least one silanol group;
- and
- (b) at least one —OR group
- wherein R represents an alkyl group having from 1 to 8 carbon atoms, or an alkoxyalkyl group having from 2 to 8 carbon atoms in the presence of
- (c) a calcium or magnesium catalyst selected to allow the reaction to proceed wherein the calcium or magnesium catalyst is not calcium carbonate, calcium phosphate or magnesium carbonate;
- and
- (d) at least one protic solvent.
Dependencies are inferred from the claim text.