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US 2015/0175482 A1Published application
Gypsum board with improved starch binder
AssigneeGold Bond Building Products, LLC
InventorsEli Stav, Ma-Ikay Miatudila, Susan Wiggins
Life of this patent
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Abstract
Gypsum board having improved performance is obtained by controlling the distribution of starch in the gypsum core of the board and the gelling temperature of the starch. Starch migration in the board is controlled by the degree of acid-modification, to adjust the starch viscosity profile. The starch gelling temperature is controlled by chemical modification of the starch —OH groups.
Claims23
A gypsum board formed from a gypsum slurry having a composition comprising:
- stucco;
- and
- an acid modified starch having a peak viscosity of between about 200 BU to about 2000 BU.
A gypsum board, comprising:
- a gypsum core formed from a gypsum slurry comprising stucco and an acid modified starch, the gypsum core having a front side, a back side, and a center core between the front and back sides;
- and
- a facing material disposed at the front and back sides of the gypsum core;
- wherein the gypsum core has a ratio of acid modified starch content of the near the front and back facing material to the acid modified starch content in the center core of between about 1.0 to 1.7.
1 more element
A gypsum board formed from a gypsum slurry having a composition comprising:
- stucco;
- and
- a starch that is chemically modified to reduce hydrogen bonding.
Dependencies are inferred from the claim text.