Hydration enhancing additives
US6409823B1 · kind B1 · utility
26Cited by
13References
30Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 28, 1999 |
| Grant date | Jun 25, 2002 |
| Priority date | — |
| Expiry date | Dec 28, 2019 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B2103/10
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
An additive for accelerating the setting reaction of gypsum products is disclosed. It comprises a gypsum accelerator combined with a bisulfate salt. The gypsum accelerator is calcium sulfate dihydrate. The accelerator may optionally be ground with a sugar, a starch and/or boric acid. A process utilizing this additive combination is also disclosed. The bisulfate salt is most advantageously prewet with a portion of the calcium sulfate hemihydrate feed before being combined with the gypsum accelerator, water and the remaining portion of the calcium sulfate hemihydrate feed in the main mixer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.