Gypsum-based composite materials reinforced by cellulose ethers
US6902797B2 · kind B2 · utility
34Cited by
51References
62Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 27, 2003 |
| Grant date | Jun 7, 2005 |
| Priority date | — |
| Expiry date | May 27, 2023 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/256
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A gypsum-based composite structure is prepared from a slurry comprising a mixture of calcium sulfate hemihydrate, a cellulose ether additive other than CMC and an amount of water that is sufficient to form a slurry. The calcium sulfate hemihydrate is hydrated by the water forming a wallboard core reinforced by the cellulose ether additive. The concentration, viscosity grade and degree of substitution of the cellulose ether are selected to give the composite improved nail pull resistance and greater flexural strength.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.