Granulated hydrophobic additive for gypsum compositions
US7311770B2 · kind B2 · utility
3Cited by
14References
21Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 20, 2001 |
| Grant date | Dec 25, 2007 |
| Priority date | — |
| Expiry date | Sep 9, 2022 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B2111/27
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A hydrophobic gypsum composition is provided which contains gypsum, a granulated hydrophobing additive and a pH effecting additive in an amount sufficient to maintain the pH of the composition in the range of 8 and 12.5, in the presence of water. The granule contains an organopolysiloxane having silicon bonded hydrogen, a water soluble or water dispersible binder, and a carrier, preferably gypsum or a stearate salt, in an amount sufficient to hydrophobe the gypsum. The pH effecting additive is preferably lime but may be any appropriate additive.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.