Method of impregnating

US4810536A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Bernhard Jansen · Cologne, DE
• Hanns P. Muller · Leverkusen, DE
• Roland Richter · Cologne, DE
• Dietmar Schapel · Cologne, DE
• Rudolf Schmidt · Giengen an der Brenz, DE

Key dates

• Filing date: Aug 10, 1987
• Grant date: Mar 7, 1989
• Expiry date: Aug 10, 2007

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G18/78
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Impregnating agents are provided consisting essentially of PA0 (a) an NCO-prepolymer or NCO-semi-prepolymer which is curable by atmospheric moisture, with an NCO content of 2 to 25% by weight, based on PA1 (a1) an organic polyisocyanate and PA1 (a2) a compound with at least 2 alcohol hydroxyl groups, PA0 (b) a solvent which is inert with respect to isocyanate groups in which the (a1) organic polyisocyanate is a polyisocyanate with exclusively aliphatically or cycloaliphatically bound isocyanate groups and the (a2) polyhydroxyl compound is a polysiloxane of the molecular weight range of 300 to 5000 which has at least 2 alcoholically bound hydroxyl groups. A method of impregnating mineral substrates with such impregnating agents is also provided.