Method for making a lightweight gypsum composition with internally generated foam and products made from same
AssigneeUnited States Gypsum Company
InventorsSamar Emami, Salvatore C. Immordino, Robert H. Negri, David D. Pelot, Jeffrey F. Grussing, Juan Carlos Ruiz Castañeda, Christopher R. Nelson, John Jason Roxburgh, Srinivas Veeramasuneni
Life of this patent
Estimating the term…
Abstract
A gypsum-based composition of calcium sulfate hemihydrate with (a) alum and calcium carbonate and/or (b) zeolite and sodium percarbonate for making foamed gypsum slurry. A method to make foamed gypsum slurry from the composition. A method to make foamed gypsum product from the composition. A cavity wall having a cavity filled with the foamed gypsum product.
Claims13
A gypsum-based composition comprising a mixture of ingredients, based on 100 parts by weight of said ingredients on a water free basis, comprising:
- at least 70 wt. % calcium sulfate hemihydrate;
- a combination of compounds for generating CO2 gas when mixed with water comprising:
- 3 to 20 wt. % calcium carbonate and 3 to 15 wt. % at least one aluminum compound selected from aluminum sulfate and potassium aluminum sulfate for generating the CO2 gas;
- 0.2 to 5 wt. % cellulose thickener.
Dependencies are inferred from the claim text.