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US 2012/0238671 A1Published application
Silicone resin emulsion and use thereof in hydrophobing plaster
AssigneeWacker Chemie AG
InventorsSabine Hoffmann, Michael Messner, Daniel Schildbach
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Abstract
Silicone resin emulsions especially suitable for hydrophobing gypsum compositions together with H-siloxanes are prepared by hydrolysis and subsequent distillation to an alcohol content of less than 0.1 weight percent. Use of the emulsion with H-siloxanes provides plaster products such as plasterboard of increased hydrophobicity.
Claims11
-8. (canceled)
A silicone resin emulsion (SE) prepared by a process comprising,
- a) in a first step, mixing 100 parts by weight of alkyltrialkoxysilane of the formula I
- R(R1O)3Si (I),
- 0 to 5 parts by weight of alkylalkoxysilane of the formula II
- R′a(R1′O)bSi (II),
- 400 to 2500 parts by weight of water, and
- 5 to 50 parts by weight of emulsifier, at 10 to 100° C. to form alcohol R1OH with or without R1′OH, and
- b) in a second step, distilling of the first step product alcohol R1OH and, if present, R1′OH down to a total alcohol content of not more than 0.1 wt %, wherein
- R and R′ are alkyl moieties of 1-10 carbon atoms,
- R1 and R1′ are alkyl moieties of 1-6 carbon atoms,
- a is 0, 1, 2 or 3, and
- b is 1, 2, 3 or 4.
8 more elements
Dependencies are inferred from the claim text.