Mixtures and emulsions for use in providing strength to gypsum compositions
US8748515B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 18, 2011 |
| Grant date | Jun 10, 2014 |
| Priority date | — |
| Expiry date | Feb 18, 2031 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B40/0039
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Settable gypsum compositions are described herein which include a gypsum slurry, comprising water; and a first additive comprising a vinyl acetate/ethylene copolymer in latex or emulsion form and a second additive which is at least one of (i) a wetting agent and/or a surfactant; (ii) a titanium coupling agent, (iii) a zirconium coupling agent, and (iv) mixtures thereof. The compositions demonstrate improved strength and gypsum core adhesion. Such compositions may also include at least one dispersant and/or a wetting agent and/or a surfactant. Such dispersants may be lignosulfonic acid, naphthalene sulfonic acid, and combinations and salts thereof and the wetting agent and/or surfactant may be N-dodecyl 2-pyrrolidone, ethoxylated alcohol, and combinations thereof. The dispersant and/or wetting agents and/or surfactants can further enhance rheological properties to benefit the enhanced strength gypsum compositions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.