Process for the water-repellent impregnation of plaster

US5624481A · kind A · utility

Assignee

• Wacker Chemie AG · DE

Inventors

• Dieter Gerhardinger · Burghausen, DE
• Hans Mayer · Frankfurt am Main, DE
• Johannes Mittermeier · Altötting, DE

Key dates

• Filing date: Sep 13, 1996
• Grant date: Apr 29, 1997
• Expiry date: Sep 13, 2016

Classification

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

Abstract

Plaster is rendered water-repellent by impregnation with organosiloxanes containing Si-bonded hydrogen atoms and with alkali metal silicate. In particular, the water-repellent action is improved in the case of shaped plaster articles treated at high drying temperatures.