Hydrophobicizing agents for hydrophobicizing gypsum-plaster-bound construction materials

US6547874B2 · kind B2 · utility

Assignee

• WACKER POLYMER SYSTEMS GMBH & CO. KG · DE

Inventors

• Herbert Eck · Burghausen, DE
• Klaus Adler · Rheda-Wiedenbrück, DE

Key dates

• Filing date: Jan 25, 2001
• Grant date: Apr 15, 2003
• Expiry date: Mar 14, 2021

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C04B20/1051
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

The invention relates to a hydrophobicizing agent for gypsum-plaster-bound construction materials comprising a substrate based on pulverulent organic or inorganic solids with a BET surface area >5 g/m2 and comprising one or more organopolysiloxanes having Si-bonded hydrogen (organohydropolysiloxanes) built up from units of the general formula HaSiR1bO(4-a-b)/2, where the radicals R1 are identical or different monovalent hydrocarbon or hydrocarbonoxy radicals having from one to 15 carbon atoms, or are hydroxyl groups, with the proviso that at least one Si-bonded hydrogen atom per molecule is present, and a takes values from 0 to 3, and b takes values from 0 to 3.