Radiation-crosslinking and thermally crosslinking PU systems based on isocyanate-reactive block copolymers

US7879509B2 · kind B2 · utility

Assignee

• Bayer MaterialScience AG · DE

Inventors

• Nicolas Stöckel
• Friedrich-Karl Bruder · Krefeld, DE
• Harald Blum · Wachtendonk, DE

Key dates

• Filing date: Apr 10, 2008
• Grant date: Feb 1, 2011
• Expiry date: Jan 28, 2029

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S525/903
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The present invention provides polyurethane systems which cure by radiation and thermal action with crosslinking, and use thereof for the production of holographic media. The polyurethane compositions of the invention comprise A) polyisocyanates, B) isocyanate-reactive block copolymers, C) compounds having groups which react on exposure to actinic radiation with ethylenically unsaturated compounds with polymerization, D) optionally free radical stabilizers and E) photoinitiators.