Water-repellent gypsum mortar

US4371399A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Adolf May
• Franz J. Voetz · Bad Camberg, DE
• August Gerl · Frankfurt am Main, DE

Key dates

• Filing date: Feb 9, 1982
• Grant date: Feb 1, 1983
• Expiry date: Feb 9, 2002

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C04B2111/27
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A water-repellent gypsum mortar contains an agent conferring hydrophobic properties, which is composed of (a) a fatty amine of the formula ##STR1## in which R.sub.1 is C.sub.8 -C.sub.22 -alkyl, C.sub.8 -C.sub.22 -alkenyl or C.sub.8 -C.sub.22 -alkylphenyl, R.sub.2 and R.sub.3 are hydrogen, C.sub.1 -C.sub.4 -alkyl, C.sub.2 -C.sub.4 -alkenyl, C.sub.1 -C.sub.4 -alkoxy-C.sub.1 -C.sub.4 -alkyl, C.sub.1 -C.sub.4 -hydroxyalkyl, phenyl, benzyl or a group of the formula --(CH.sub.2 CH.sub.2 O).sub.n H and n is a number from 0 to 4, PA0 (b) a low-molecular acid and PA0 (c) an alkali metal siliconate.