Process for the preparation of polyurethane powders

US5061756A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Tillmann Hassel · Cologne, DE
• Hanns P. Muller · Leverkusen, DE
• Hugo Vernaleken · Walsrode, DE
• Helmut Kipphardt · Cologne, DE
• Rolf Dhein · Krefeld, DE

Key dates

• Filing date: Aug 10, 1990
• Grant date: Oct 29, 1991
• Expiry date: Aug 10, 2010

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G18/0871
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The present invention is directed to an improved process for the direct preparation of polyurethane powders in a finely divided form by the reaction of polyisocyanates and isocyanate reactive compounds in a carrier phase, using interface active compounds, the improvement wherein the interface active compound used consists of at least one polymer of a urethane of (i) a long chain alkyl isocyanate and (ii) a hydroxyalkyl-acrylic or -metacrylic acid ester.