Accelerator comprising starch, and related board, slurries, and methods
US11834374B2 · kind B2 · utility
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21References
12Claims
0Family size
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Key dates
| Filing date | Sep 10, 2018 |
| Grant date | Dec 5, 2023 |
| Priority date | — |
| Expiry date | Apr 9, 2040 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B2201/10
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
An accelerator for accelerating the rate of hydration of calcined gypsum is disclosed. The accelerator comprises calcium sulfate dihydrate particles and a starch. The starch has a cold water solubility of at least about 25% (e.g., at least about 35%) and a viscosity of about 25 Brabender Units (BU) or less when the starch is in a 30% aqueous slurry at 92° C. Also disclosed are a method of preparing an accelerator, method of hydrating stucco to form set gypsum, slurry, and method of making gypsum board.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.