Method for reducing water in a gypsum slurry
- Assignee
- United States Gypsum Co
- Inventors
- James R. Wittbold, Bruce Lynn Petersen, Alfred Li
- Jurisdiction
- European Patent Office
- Filed
- 2007-08-17
- Published
- 2020-04-08
- Priority
- 2008-08-05
This invention relates to a foamed gypsum slurry. More specifically, it relates to a foamed gypsum slurry that includes a defoamer to produce a distribution of foam bubbles. The gypsum slurry is useful for making building panels.
A method of reducing water in a gypsum slurry with the water to stucco ratio from 0,1 to 0,9, based on dry weight of the stucco, comprising: preparing a gypsum slurry by mixing in a mixer a mixture comprising water, calcined gypsum, a defoamer and a dispersant, wherein the dispersant consists essentially of a first and a second repeating unit, wherein said first repeating unit is an olefinic unsaturated mono-carboxylic acid repeating unit or an ester or salt thereof, or an olefinic unsaturated sulphuric acid repeating unit or a salt thereof, and said second repeating unit is of the general formula (I) […]
Further claims, drawings, prosecution history and legal status: see the official record.
- [1]EP 2 190 797 B1 — Method for reducing water in a gypsum slurry — Google Patents · 2020-04-08