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US 12,291,485 B2Granted
Gypsum cement compositions with aggregate stabilizers and methods for forming floor underlayment
AssigneeUnited States Gypsum Company
InventorsKarl Glenn Niessner, Dennis Mark Lettkeman, John Wesley Wilson, William Kelly Bedwell
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Abstract
This disclosure provides gypsum cement compositions which comprise an aggregate stabilizing mixture containing a combination of a polysaccharide gum and a polyacrylamide-gelatin blend, and methods for making and using these compositions, including pourable/pumpable floor underlayment slurries and methods for forming high strength underlayment on different substrates.
Claims19
A composition for producing a gypsum cement slurry, the composition comprising:
- a) calcium sulfate hemi-hydrate;
- b) cement;
- c) a dispersant;
- d) a defoamer;
- and
- e) an aggregate stabilizing mixture, wherein the aggregate stabilizing mixture comprises:
- a polysaccharide gum in an amount from 0.001% to 0.5% by weight of the composition, and
- a polyacrylamide-gelatin blend in an amount from 0.00125% to 0.01% by weight of the composition;
- and
- wherein the composition is a dry mixture.
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A method of preparing a calcium sulfate hemi-hydrate/cement composition, the method comprising:
- a) mixing together an aggregate stabilizing mixture containing alpha-calcined calcium sulfate hemihydrate, a polysaccharide gum and polyacrylamide-gelatin blend;
- and
- b) mixing the mixture of step a) into a composition comprising at least the following components:
- calcined gypsum and/or synthetic gypsum, and cement, and
- wherein the aggregate stabilizing mixture is mixed in step b) in an amount resulting in the composition comprising:
- a polysaccharide gum in an amount from 0.001% to 0.5% by weight of the composition, and
- a polyacrylamide-gelatin blend in an amount from 0.00125% to 0.01% by weight of the composition.
4 more elements
Dependencies are inferred from the claim text.