Gypsum board from gypsum having high level of chloride salt and a starch layer and methods associated therewith
US11186067B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 2, 2019 |
| Grant date | Nov 30, 2021 |
| Priority date | — |
| Expiry date | May 28, 2039 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B2111/0062
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
Gypsum boards formed from synthetic gypsum and other gypsum sources having high chloride salt concentrations. Gypsum boards may include a board core including set gypsum. A total concentration of the chloride anion in the board core ranges from about 500 ppm to about 3000 ppm, typically about 1000 ppm to about 3000 ppm, based on weight of the calcium sulfate hemihydrate. An inner surface of a front paper cover sheet contacts a first face of the board core. An inner surface of a back paper cover sheet contacts a second face of the board core. A starch layer coats the inner surface of at least one of the front and back cover sheet. Methods of making the gypsum board, and a wall system for employing the gypsum boards, are also provided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.