Water-based organic polysiloxane-containing compositions, processes for their preparation and their use

US5679147A · kind A · utility

Assignee

• Huels Aktiengesellschaft · DE

Inventors

• Burkhard Standke · Soest, DE
• Christine Fliedner · Bonn, DE
• Albert-Johannes Frings · Rheinfelden (Baden), DE
• Michael Horn · Rheinfelden (Baden), DE
• Hans-Joachim Koetzsch · Rheinfelden (Baden), DE
• Jaroslaw Monkiewicz · Rheinfelden (Baden), DE
• Hans-Guenther Srebny · Coesfeld, DE

Key dates

• Filing date: Dec 8, 1995
• Grant date: Oct 21, 1997
• Expiry date: Dec 8, 2015

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G77/26
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Water-based organopolysiloxane-containing compositions which are essentially free from organic solvents, have a flashpoint above 80.degree. C., and essentially liberate no alcohols by hydrolysis on dilution with water are obtainable by mixing water-soluble aminoalkylalkoxysilanes with alkyltrialkoxysilanes and/or dialkyldialkoxysilanes and/or mixtures of alkyltrialkoxysilanes and dialkyldialkoxysilanes which are not water-soluble, adding water to the mixture, adjusting the pH of the reaction mixture to a value of between 1 and 8 and removing any alcohol already present and/or formed during the reaction. Such compositions are especially useful for hydrophobicizing the surface of building materials such as brick, concrete, lime sand brick, and mortar.