Silicone resin powder and a process for preparing the same
AssigneeWacker Chemie AG
InventorsMatthias Wolfgruber, Bernward Deubzer, Volker Frey
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Abstract
Silicone resin powders are obtained by spray drying aqueous colloidal suspensions of organopolysiloxanes which are prepared by adding an alkoxysilane and/or a partial hydrolysate thereof and, if appropriate, mixed with an organo(poly)siloxane which is free of alkoxy groups and contains a maximum of 8 siloxane units per molecule, to water in the presence of an emulsifier at a maximum rate of 5 moles of organosilicon compound per hour per liter of water.
Claims4
A process for preparing a silicone resin powder which comprises forming an aqueous colloidal suspension of an organopolysiloxane by adding an organosilicon compound selected from the group consisting of
- (a) at least one alkoxysilane;
- (b) a partial hydrolyzate of (a);
- (c) a mixture of (a) and (b);
- (d) a mixture of an organo(poly)siloxane which is free of alkoxy groups and has a maximum of 8 siloxane units per molecule with (a)
- (e) a mixture of an organo(poly)siloxane which is free of alkoxy groups and has a maximum of 8 siloxane units per molecule with (b);
- and
- (f) a mixture of an organo(poly)siloxane which is free of alkoxy groups and has a maximum of 8 siloxane units per molecule with (a) and (b) to water in the presence of an emulsifier at a maximum rate of 5 moles of organosilicon compound per hour per liter of water, distilling off the hydrolytically-formed alkanol and thereafter spray drying the resultant aqueous suspension.
Dependencies are inferred from the claim text.