Calcium sulphate-based products having enhanced water resistance
US9127166B2 · kind B2 · utility
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9Claims
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Key dates
| Filing date | May 24, 2010 |
| Grant date | Sep 8, 2015 |
| Priority date | — |
| Expiry date | Oct 30, 2031 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B2111/27
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A water-resistant calcium sulphate based body comprises a matrix of crystalline calcium sulphate anhydrite, crystals of the matrix being connected to one another by water-resistant phosphate bonding zones, optionally also containing aluminum. The body can be produced by impregnating a porous calcium sulphate with a source of phosphate ions (optionally containing aluminum), and then calcining. Alternatively, a paste comprising calcium sulphate and a source of phosphate ions (optionally containing aluminum) is heated or compressed to form a ‘green body’ and then calcined to produce the body.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.