Preparation of stable dispersions of finely divided polyisocyanates and preparation of heat-crosslinkable isocyanate systems

US4888124A · kind A · utility

Assignee

• BASF SE

Inventors

• Rainer Blum · Ludwigshafen, DE
• Horst Belde · Ludwigshafen, DE
• Rolf Osterloh · Lechenich, DE
• Guenter Uhl · Worms, DE

Key dates

• Filing date: Oct 23, 1987
• Grant date: Dec 19, 1989
• Expiry date: Oct 23, 2007

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G18/707
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A process for the preparation of stable dispersions of finely divided polyisocyanates, and the preparation of heat-crosslinkable isocyanate systems. Stable dispersions of finely divided polyisocyanates in a liquid which may or may not contain surfactants, protective colloids and other assistants are obtained by a method in which polyisocyanates are treated with a stabilizer in the presence of absence of the liquid, and the dispersions prepared from these are finely dispersed and/or milled under the action of high shear forces, if necessary with the addition of further stabilizer. These dispersions are useful as crosslinking agents, particularly for the preparation of heat-cross-linkable isocyanate systems.