Process for the preparation of stable dispersions of polyisocyanate-polyaddition products in a hydroxyl containing compound as dispersing agent

US4184990A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Artur Reischl · Leverkusen, DE
• Armin Zenner · Dormagen, DE

Key dates

• Filing date: Nov 10, 1976
• Grant date: Jan 22, 1980
• Expiry date: Nov 10, 1996

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08J2375/04
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The instant invention relates to the preparation of stable, relatively low viscosity dispersions of polyisocyanate-polyaddition products in hydroxyl containing compounds as dispersing agents. The process broadly comprises mixing an aqueous dispersion of an isocyanate-polyaddition product with a compound having at least two hydroxyl groups and having a boiling point about 100.degree. C., and thereafter at least partially distilling off the water.