RADIATION-CROSSLINKING AND THERMALLY CROSSLINKING PU SYSTEMSBASED ON ISOCYANATE-REACTIVE BLOCK COPOLYMERS

摘要

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