Effective use of dispersants in wallboard containing foam
US7544242B2 · kind B2 · utility
20Cited by
53References
21Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 9, 2006 |
| Grant date | Jun 9, 2009 |
| Priority date | — |
| Expiry date | Jan 17, 2027 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B2111/0062
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Effective use of dispersants in wallboard containing foam results from a method where stucco is mixed with a first dispersant and a first quantity of water to form a gypsum slurry. A soap is blended with a second dispersant and a second quantity of water to make a foam. Subsequently, the foam is combined with the slurry. Choice of different first and second dispersants and their relative amounts allows control of the size distribution of the foam bubbles in the slurry and the resulting voids in the gypsum core. Use of the same dispersant in both the mixer and the foam water provides a boost in efficacy of the dispersant.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.