Patent ID: 6171388
Filing Date: 2001-01-09
Classification: C04B,E04C

Abstract:
A composition of matter comprising(a) gypsum (CaSO.sub.4 . 2H.sub.2 O)(b) one or more naturally occurring or synthetic latex polymers present in an amount of between about 0.25 to about 10 parts by weight per 100 parts by weight of gypsum hemihydrate necessary to Drovide the gypsum; and(c) one or more nonionic surfactants present in an amount of between about 0.05 and about 0.3 part by weight per part by weight of latex polymer;wherein wallboard produced from said composition of matter and water satisfies the criteria of ASTM Methods C-36 and C-473 and has a molded density of less than about 0.64 g/cm.sup.3.