WO 2015/085139 A1

Gypsum composite modifiers

(22) 05.12.2014

(43) 11.06.2015

(57) Anhydrite calcium sulfate whiskers are prepared by combining alpha calcium sulfate hemihydrate and water to form a slurry, autoclaving the slurry to form alpha calcium sulfate hemihydrates whiskers in water, dewatering the alpha calcium sulfate hemihydrates whiskers, and heating the alpha calcium sulfate hemihydrates whiskers to form anhydrite calcium sulfate whiskers. A composite includes alpha-derived anhydrite calcium sulfate whiskers and a base material and is prepared by combining alpha-derived anhydrite calcium sulfate whiskers with a base material to form a composite.

(71) Georgia Pacific Gypsum LLC, 133 Peachtree St. NE, Atlanta, GA 30303 (US), Flint Hills Resources, LP, 11 East 37th Street N, Wichita, KS 67220 (US)

(84) ARIPO (BW GH GM KE LR LS MW MZ NA RW SD SL ST SZ TZ UG ZM ZW), Eurasian (AM AZ BY KG KZ RU TJ TM), European (AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR), OAPI (BF BJ CF CG CI CM GA GN GQ GW KM ML MR NE SN TD TG)

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