Method of making a gypsum slurry with modifiers and dispersants
US7572329B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 9, 2006 |
| Grant date | Aug 11, 2009 |
| Priority date | — |
| Expiry date | Nov 15, 2026 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/232
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
In a method of making a gypsum slurry, a polycarboxylate dispersant, a modifier and a hydraulic material comprising stucco are selected for use in the slurry. These components are then combined with water to form a slurry, where the modifier is added to the slurry prior to formation of a slurry phase by the water, the stucco and the dispersant. The modifier has been shown to be less effective when added after the dispersant and stucco have been contacted in an aqueous slurry. In a preferred embodiment, an amount of stucco is obtained and the modifier and dispersant are selected. A predissolved solution of a dispersant and modifier is prepared in water to form a solution prior to the addition of the stucco. After mixing the solution, the stucco is added to form the slurry. Optionally, the slurry is then shaped into a product and allowed to set.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.