Patent ID: 6547874
Filing Date: 2003-04-15
Classification: C04B

Abstract:
A gypsum plaster-containing composition, comprising, per 100 parts gypsum plaster, a pulverulent hydrophobicizing agent sufficient to supply from 0.05 to 5 parts by weight of an organohydropolysiloxane, said pulverulent hydrophobicizing agent consisting essentially of at least one organohydropolysiloxane containing units of the formulaHaSiR1bO(4-a-b)/2, whereinR1 independently are monovalent C1-15 hydrocarbon radicals, C1-15 hydrocarbonoxy radicals or hydroxyl radicals, a is from 0 to 3, and b is from 0 to 3, with the proviso that at least one Si-bonded hydrogen is present on average per molecule, supported on a pulverulent organic or inorganic solid substrate having a BET surface area greater than 5 m2/g.