Coated gypsum set stabilizing particles having a hydrophobic gypsum core, gypsum board including same, process for making the particles, and process for making the gypsum board

Abstract

A plurality of set stabilizer particles including: a particle core including 50 to 98 wt. %, preferably 70 to 98 wt. % or 70 to 95 wt. %, calcium sulfate dihydrate and 0.05 to 10 wt. %, preferably 0.5 to 5 wt. %, hydrophobic material selected from wax and/or siloxane, and a coating on the particle core, the coating including a dehydration-preventing substance selected from sugars, dextrins, and polyhydroxy alcohols, such as glycerol or polyglycols, at a ratio of about 5 to 25 parts by weight of dehydration-preventing substance per 100 parts by weight of calcium sulfate dihydrate. Methods of making and using the set stabilizer particles are also disclosed.

Dependencies are inferred from the claim text.