Polyisocyanate solutions useful for impregnating porous inorganic substrates

US5254660A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Stephan Kirchmeyer · Leverkusen, DE
• Hanns P. Muller · Leverkusen, DE
• Hermann Kober · Bensberg, DE
• Stefan Bohm · Cologne, DE
• Josef Pedain · Cologne, DE

Key dates

• Filing date: Nov 2, 1992
• Grant date: Oct 19, 1993
• Expiry date: Nov 2, 2012

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/249956
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Solutions of a) a fluorine-containing polyisocyanate in b) an isocyanate-inert solvent are used to impart water, oil and dirt resistance to porous inorganic substrates impregnated therewith. The fluorine-containing polyisocyanate is preferably selected from fluorine-containing polyisocyanates having a fluorine content in the form of perfluorinated alkyl groups of from about 15 to about 60% by weight and an isocyanate content of from about 0.5 to about 15% by weight. These isocyanates are obtained by reaction of (cyclo)aliphatic isocyanates with fluorine-containing mono- and polyhydric alcohols, and selected fluorine-containing alcohols suitable for the production of these polyisocyanates.