Gypsum wallboard and method of making same
US5879825A · kind A · utility
33Cited by
14References
34Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 7, 1997 |
| Grant date | Mar 9, 1999 |
| Priority date | — |
| Expiry date | Jan 7, 2017 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B2201/50
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A method of preparation and use of high-strength gypsum wallboard, as well as a core composition suitable for use therein, are disclosed. The core composition includes a slurry of calcium sulfate hemihydrate (stucco), water, and a strengthening agent. The strengthening agent includes an acrylic polymer composition having a glass transition temperature of about 15.degree. C. or greater, and preferably has good divalent ion stability. The method provides wallboard having increased core strength, paper-to-core bonding, and strength-to-weight ratio.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.