Polyurthanes with covalently bonded photoinitiator units

US6031044A · kind A · utility

Assignee

• BASF SE

Inventors

• Nicolas Kokel · Alleins, FR
• Harald Larbig · Ludwigshafen, DE
• Klaus Menzel · Berlin, DE
• Erich Beck · Ladenburg, DE
• Wolfgang Reich · Frankenthal (Pfalz), DE
• Guido Voit · Freinsheim, DE

Key dates

• Filing date: Dec 18, 1997
• Grant date: Feb 29, 2000
• Expiry date: Dec 18, 2017

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/31551
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A polyurethane which is substantially self-dispersible in water and is obtainable by reacting PA1 a) at least one polyisocyanate with PA1 b) at least one polyol and PA1 c) at least one photoinitiator of the general formula I ##STR1## where R is a radical of the formula II ##STR2## or is --CR.sup.7 R.sup.8 R.sup.9, P(.dbd.O)(R.sup.10).sub.2 or SO.sub.2 R.sup.11, the number-average molecular weight M.sub.n of the polyurethane being greater than 2700, and its use. The invention also relates to aqueous polyurethane resin dispersions and coating compositions comprising the novel polyurethanes, and to their use.