	US 12,145,881 B2
	Calcium sulfate slurries including cationic starch, methods for using them and articles made from them
Fengqui Fan, Hoffman Estates, IL (US); Meggan Hostetler-Schrock, Hoffman Estates, IL (US); and Jeremy Iwanski, Hoffman Estates, IL (US)
Assigned to Primary Products Ingredients Americas LLC, Hoffman Estates, IL (US)
Appl. No. 17/614,875
Filed by Primary Products Ingredients Americas LLC, Hoffman Estates, IL (US)
PCT Filed May 29, 2020, PCT No. PCT/US2020/035347 § 371(c)(1), (2) Date Nov. 29, 2021, PCT Pub. No. WO2020/243586, PCT Pub. Date Dec. 3, 2020.
Claims priority of provisional application 62/855,402, filed on May 31, 2019.
Prior Publication US 2022/0234950 A1, Jul. 28, 2022
Int. Cl. C04B 11/00 (2006.01); C04B 24/38 (2006.01); C04B 26/28 (2006.01); C04B 28/14 (2006.01); C08B 31/12 (2006.01); C08L 3/18 (2006.01); C04B 111/00 (2006.01)

CPC C04B 11/002 (2013.01) [C04B 24/38 (2013.01); C04B 26/28 (2013.01); C04B 28/14 (2013.01); C08B 31/125 (2013.01); C08L 3/18 (2013.01); C04B 2111/0062 (2013.01); C04B 2201/10 (2013.01)]

25 Claims

1. A calcium sulfate slurry composition comprising

calcium sulfate present substantially in the form of one or more hydrates, the calcium sulfate being present in an amount in the range of 70-99.8 wt % on a dry basis, calculated as stucco;

a cationic starch present in an amount of 0.10-10 wt % of the amount of calcium sulfate as stucco on a dry basis, the cationic starch being substituted with amine and/or ammonium groups and having a % N value in the range of 0.10 wt % to 2 wt %, and an RVA viscosity value of at least 100 cP at 65° C. and 16 wt %;

water, in an amount sufficient to form a slurry,

wherein the cationic starch has a water solubility of no more than 3%.