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US 11,773,020 B2Granted
Gypsum composition comprising uncooked starch having mid-range viscosity, and methods and products related thereto
AssigneeUnited States Gypsum Company
InventorsYijun Sang, Brian J. Christ
Life of this patent
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Abstract
Disclosed are product (e.g., board), slurry, and methods relating to an uncooked starch that can be used to enhance strength in one or more gypsum layers in the board. The uncooked starch has a hot water viscosity of from about 20 BU to about 300 BU according to the HWVA method, and/or a mid-range peak viscosity of from about 120 Brabender Units to about 1000 Brabender Units.
Claims15
A gypsum board comprising:
- a set gypsum core disposed between two cover sheets, the core formed from a slurry comprising stucco, water, and at least one uncooked starch prepared by hydrolyzing glycosidic bonds in a native starch such that a hot water viscosity of the uncooked starch is from about 20 Brabender Units to about 300 Brabender Units when the viscosity is measured by the HWVA method, wherein the uncooked starch is an uncooked acid-modified native starch.
Dependencies are inferred from the claim text.