Process for preparing water-repellent articles from gypsum powder containing hydrophobic agents

US4851047A · kind A · utility

Assignee

• Wacker Chemie AG · DE

Inventors

• Ulrich Demlehner · Emmerting, DE
• Herbert Eck · Burghausen, DE
• Heinrich Hopf · Burghausen, DE
• Erich Pilzweger · Julbach, DE
• Otto Zeller · Braunau am Inn, AT

Key dates

• Filing date: Jan 11, 1988
• Grant date: Jul 25, 1989
• Expiry date: Jan 11, 2008

Classification

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

Abstract

The present invention relates to gypsum powders containing a hydrophobic agent and to water-repellent articles which are prepared from gypsum containing powered hydrophobic agents, in which the hydropohobic agents are prepared by spray-drying a mixture containing at least water, an organopolysiloxane having Si-bonded hydrogen and a water-soluble, film-forming polymer having a turbidity point of from 35.degree. to 98.degree. C.