Gypsum mixture containing hydrophobic additive and method for hy

Details Gypsum mixture containing hydrophobic additive and method for hy Gypsum mixture containing hydrophobic additive and method for hy

1997-07-16

1999-01-05

Marcheschi, Michael

Compositions: coating or plastic

Coating or plastic compositions

Inorganic settable ingredient containing

106 2, 106711, 106782, 10628713, 10628711, 106661, 106665, C04B 2440, C04B 1100

Patent

active

058556672

ABSTRACT:
A gypsum mixture is disclosed which has hydrophobic additive substantially uniformly dispersed therein and which comprises gypsum, a first silane of the general formula (RO).sub.3 SiR or of the general formula (RO).sub.2 SiR.sub.2, and a second silane of the general formula (RO).sub.3 SiR' or of the general formula (RO).sub.2 SiRR', wherein each R is the same or different and represents a lower alkyl group, and R' represents a lower alkyl group which is substituted by a substituent selected from an amino, amino-lower alkyl-amino or dialkylenetriamine group. Preferably, the first silane is methyltrimethoxysilane and the second silane is N-(2-aminoethyl)-3-aminopropyltrimethoxysilane. Also disclosed is a method for preparing said gypsum mixture.

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