Composition for accelerating the setting of calcined gypsum and the product formed thereby
AssigneeUnited States Gypsum Company
InventorsFelix J. DeRooy, Thell D. Daniel, Erle C. Annes, Billy G. Arnold
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Abstract
A composition for accelerating the setting of an aqueous calcined gypsum slurry, the composition comprising finely ground calcium sulfate dihydrate and a lignosulfonate. The composition, when added to an aqueous calcined gypsum slurry, accelerates the setting process and shortens the set time period as determined by the temperature rise set test procedure. The composition is useful for making gypsum wallboard.
Claims11
A dry composition for accelerating the setting reaction of an aqueous slurry of calcium sulfate hemihydrate, comprising finely ground calcium sulfate dihydrate and a lignosulfonate, said lignosulfonate being present in an amount of from about 0.5 to about 99% by weight of said composition.
Dependencies are inferred from the claim text.