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US 2014/0228589 A1Published application
Process for producing powders from alkali metal salts of silanols
AssigneeWacker Chemie AG
InventorsMichael Stepp, Michael Mueller, Birgit Peschanel
Life of this patent
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Abstract
Alkali metal silanolates are prepared by a process in which alcohol and water are removed from an alkali metal silanolate hydrolysis mixture in two steps, the second removal step occurring at a pressure lower than the first removal step.
Claims12
-9. (canceled)
A process for producing powders (P) from salts of silanols, of their hydrolysis/condensation products, or of silanols together with their hydrolysis/condensation products, and alkali metal ions cations in which the molar ratio of cation to silicon is from 0.1 to 3, comprising:
- in a first step, hydrolyzing alkoxysilanes, their hydrolysis/condensation products, or alkoxysilanes together with their hydrolysis/condensation products, wherein the alkoxy group is selected from methoxy, ethoxy, 1-propoxy and 2-propoxy groups, with alkali metal hydroxide and water,
- in a second step, distilling at least a total of 20 percent by weight of water and alcohol present in the hydrolyzate from the hydrolyzate prepared in the first step, and
- in a third step, removing residual water and alcohol at a lower pressure than in the second step.
Dependencies are inferred from the claim text.