Berman, Aisenberg & Platt
Waterproof gypsum molded product
 The present invention provides a gypsum molded product having excellent waterproof properties without impaired strength by adding alkaline metal alkylsiliconates or phenylsiliconates together with calcium hydroxide or calcium oxide to gypsum; poly(.alpha.,.beta.-unsaturated carboxylic acid) may be used in combination with the above, if desired. According to the present invention, the preparation of a gypsum molded product, particularly a gypsum from desulfurization of exhaust gas, is contemplated. 
Kurashiki Boseki Kabushiki Kaisha
C C
C04B C04B
additional inventional
Toru Masumi Eiichi Masao
Nishino Saito Hirai Endo