Process for the water-repellent impregnation of plaster

US5626668A · kind A · utility

Assignee

• Wacker Chemie AG · DE

Inventors

• Dieter Gerhardinger · Burghausen, DE
• Richard Weidner · Burghausen, DE
• Hans Mayer · Frankfurt am Main, DE

Key dates

• Filing date: Apr 9, 1996
• Grant date: May 6, 1997
• Expiry date: Apr 9, 2016

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C04B28/14
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

Water-repellent plaster compositions comprising the constituents PA1 (A) 100 parts by weight of gypsum plaster, PA1 (B) from 0.05 to 50 parts by weight of oxide or hydroxide of alkali or alkaline earth metals or a mixture thereof, and PA1 (C) from 0.05 to 20 parts by weight of an organopolysiloxane which has hydroxyl and/or alkoxy groups bonded to silicon atoms.