Back to results
US 2024/0010561 A1Published application
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
Estimating the term…
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.
Claims21
1-20. (canceled)
A gypsum board comprising:
- a set gypsum core disposed between two cover sheets, the core formed from a slurry comprising stucco, water, a migratory starch, and at least one uncooked non-migratory starch having a hot water viscosity of from 20 Brabender Units to 300 Brabender Units when the viscosity is measured by the HWVA method.
A method of forming a gypsum board comprising:
- chemically modifying an uncooked non-substituted starch having a hot water viscosity outside of a range of 20 Brabender Units to 300 Brabender Units when the viscosity is measured by the HWVA method to provide a chemically modified uncooked non-substituted starch having a hot water viscosity of from 20 Brabender Units to 300 Brabender Units;
- preparing a slurry comprising stucco, water, and the uncooked chemically modified non-substituted starch;
- and
- forming the prepared slurry over a first cover sheet;
- and
- disposing a second cover sheet over the formed prepared slurry,
- wherein the formed prepared slurry sets to form a set gypsum core between the first and second cover sheets.
4 more elements
Dependencies are inferred from the claim text.