Layer construction with a protective coating and an exposed photopolymer layer

摘要

Layer structure comprises a protective layer and an exposed photopolymer layer. The protective layer is formed by reacting (a) at least one radiation-curable resin, (b) an isocyanate-functional resin, and (c) a photoinitiator system. The component (a) comprises = 5 wt.% compounds with a weight average molecular weight less than 500, and >= 75 wt.% compounds with a weight average molecular weight of greater than 1000. The component (b) comprises = 5 wt.% compounds with a weight average molecular weight of less than 500. The component (c) comprises e.g. at least 80 wt.% component (a). Layer structure comprises a protective layer and an exposed photopolymer layer. The protective layer is formed by reacting (a) at least one radiation-curable resin, (b) an isocyanate-functional resin, and (c) a photoinitiator system. The component (a) comprises = 5 wt.% compounds with a weight average molecular weight less than 500, and >= 75 wt.% compounds with a weight average molecular weight of greater than 1000. The component (b) comprises = 5 wt.% compounds with a weight average molecular weight of less than 500. The component (c) comprises at least 80 wt.% component (a) and not > 15 wt.% component (b). An independent claim is also included for producing the above layered structure, comprising applying a mixture comprising the components (a)-(c) on the exposed photopolymer layer, and curing.