Method of producing gypsum building boards
US8617451B2 · kind B2 · utility
2Cited by
8References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 19, 2010 |
| Grant date | Dec 31, 2013 |
| Priority date | — |
| Expiry date | Jan 18, 2032 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B2111/0062
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A method of producing gypsum building board, in which there is added, to an aqueous gypsum slurry containing a water swellable clay, a basic water-soluble polymer having preferential affinity for clay. The slurry is allowed to set so as to form a board. The basic water-soluble polymer may be, for example, a polyvinyl alcohol or a polymer consisting essentially of carbon, nitrogen and hydrogen and having amine groups (which may be primary, secondary, tertiary or quaternary) in the polymer backbone and/or in side chains thereof.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.