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US 11,168,030 B2Granted
Pregelatinized starch with mid-range viscosity, and product, slurry and methods related thereto
AssigneeUnited States Gypsum Company
InventorsYijun Sang, Chris C. Lee, Cesar Chan, Weixin David Song
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Abstract
Disclosed are product (e.g., panels), slurry, and methods relating to a pregelatinized starch having a mid-range viscosity (i.e., from about 20 centipoise to about 700 centipoise), and an extruded pregelatinized starch.
Claims7
A method of making a board comprising:
- (a) mixing at least water, stucco, and at least one pregelatinized starch to form a slurry, wherein the at least one pregelatinized starch is formed by extruding a wet starch;
- the extruded pregelatinized starch having a cold water solubility greater than about 30% when measured at 25° C. and a cold water viscosity of a 10 wt. % slurry of the extruded pregelatinized starch in water when measured at 25° C. and at a shear rate of 100 s-1 for 1 min of from about 20 centipoise to about 300 centipoise;
- (b) disposing the slurry between a first cover sheet and a second cover sheet to form a wet assembly;
- (c) cutting the wet assembly into a board;
- and
- (d) drying the board;
- a set gypsum core formed from the slurry having a compressive strength greater than a set gypsum core made with a starch having a cold water solubility less than about 30% when measured at 25° C.
4 more elements
Dependencies are inferred from the claim text.