Effective use of melamine sulfonate condensate dispersants in wallboard containing foam
US9328025B2 · kind B2 · utility
2Cited by
7References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 6, 2011 |
| Grant date | May 3, 2016 |
| Priority date | — |
| Expiry date | Jul 16, 2031 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B28/14
- 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. Melamine sulfonate condensate and polycarboxylate dispersants are preferred dispersants.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.