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US 11,697,618 B2Granted
Gypsum board with improved starch binder
AssigneeGold Bond Building Products, LLC
InventorsEli Stav, Ma-Ikay Miatudila
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.
Claims10
A gypsum board, comprising:
- a gypsum core formed from a gypsum slurry having a composition comprising stucco, a starch, and an aqueous foam,
- wherein the starch includes an acid modified chemically modified by ethoxylation starch having a peak viscosity of between about 200 BU to about 800 BU,
- wherein the aqueous foam creates air pockets in the gypsum core, and
- wherein the gypsum board exhibits a nail pull resistance of from about 68 lbf to about 91 lbf in accordance with ASTM C473.
1 more element
Dependencies are inferred from the claim text.