Process for manufacturing ready-mixed setting alpha-calcium sulphate hemi-hydrate and kit for same
US7754006B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 20, 2007 |
| Grant date | Jul 13, 2010 |
| Priority date | — |
| Expiry date | Sep 5, 2028 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B2111/00086
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A process for making calcined gypsum in slurry or powder form. The process includes adding at least two types of crystal modifiers to the slurry. The first crystal modifier is to control crystal morphology of the calcined gypsum (such as succinic and/or malic acid). The second crystal modifier is to prevent or retard setting to control set time (such as tetrasodium pyrophosphate (TSPP)) to form a water stable product. An accelerator is typically added at the site of use for specific applications such as setting type joint compound, media casting, exterior/interior coating, and sprayable fireproofing. A composition made by the process and a kit for using the composition are also disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.