Aqueous or water-dilutable blocked polyisocyanates and their use for preparing polyurethane clearcoats having substantially reduced thermal yellowing

US5723536A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Beate Baumbach · Burscheid, DE
• Eberhard Konig · Kronberg, DE
• Lothar Kahl · Bensberg, DE
• Nusret Yuva · Wermelskirchen, DE

Key dates

• Filing date: Apr 3, 1997
• Grant date: Mar 3, 1998
• Expiry date: Apr 3, 2017

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G18/807
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The present invention relates to novel aqueous or water-dilutable blocked polyisocyanates and to their use for the production of one-component polyurethane coating compositions, which are stovable at relatively low temperatures of 130.degree. to 150.degree. C. and provide clear coatings having substantially reduced thermal yellowing.