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US 7,608,347 B2Granted
Modifiers for gypsum slurries and method of using them
AssigneeUnited States Gypsum Company
InventorsDennis M. Lettkeman, Michael P. Shake, Qingxia Liu, John W. Wilson, Brian Randall, David R. Blackburn
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Abstract
An improved gypsum slurry that includes water, calcium sulfate hemihydrate, a polycarboxylate dispersant and a modifier. The modifier is chemically configured to improve the efficacy of the polycarboxylate dispersant. Preferred modifiers include cement, lime, slaked lime, soda ash, carbonates, silicates and phosphates.
Claims8
A gypsum panel comprising
- at least one facing material;
- and
- a gypsum core comprising a hydrated gypsum slurry, said slurry comprising:
- water;
- calcined gypsum;
- a polycarboxylate dispersant;
- and
- at least one modifier chemically configured to increase the efficacy of said polycarboxylate dispersant.
5 more elements
Dependencies are inferred from the claim text.