Patent ID: 8715888
Filing Date: 2014-05-06
Classification: C08G,C08J,C08L,C09D,G03F,G03H,G11B

Abstract:
1. A continuous process for the production of photopolymer films, comprising mixing components A) a polyisocyanate component which comprises an NCO-terminated polyurethane prepolymer having NCO groups primarily aliphatically bonded and which is based on hydroxy-functional compounds having an OH functionality of 1.6 to 2.05, B) isocyanate-reactive polyether polyols, C) urethane acrylates and/or urethane methacrylates having at least one aromatic structural unit and a refractive index of greater than 1.50 at 405 nm, wherein the urethane acrylates and/or urethane methacrylates are free of NCO groups and OH groups, D) free radical stabilizers, E) photoinitiators based on combinations of borate salts and one or more dyes having absorption bands which at least partly cover the spectral range from 400 to 800 nm, F) optionally catalysts, and G) optionally auxiliaries and additives, to form a polyurethane composition, wherein immediately after complete mixing of components A) through E), and optionally F) and G), said polyurethane composition has a viscosity at 25° C. in the range of from 200 to 10,000 mPa·s, and coating a support film by the roll-to-roll principle with said polyurethane composition, wherein said support film is moving at a speed in the range of from 0.2 m/min to 300 m/min.