	US 11,697,618 B2
	Gypsum board with improved starch binder
Eli Stav, Charlotte, NC (US); and Ma-Ikay Miatudila, Monroe, NC (US)
Assigned to Gold Bond Building Products, LLC, Charlotte, NC (US)
Filed by National Gypsum Properties, LLC, Charlotte, NC (US)
Filed on Dec. 18, 2014, as Appl. No. 14/575,867.
Claims priority of provisional application 61/919,450, filed on Dec. 20, 2013.
Prior Publication US 2015/0175482 A1, Jun. 25, 2015
Int. Cl. C04B 11/00 (2006.01); B32B 18/00 (2006.01); C04B 28/14 (2006.01); C04B 24/38 (2006.01); C04B 111/00 (2006.01)

CPC C04B 28/145 (2013.01) [C04B 24/38 (2013.01); C04B 2111/0062 (2013.01); Y10T 428/31971 (2015.04)]

10 Claims

1. 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.