PROTECTIVE LACQUERS AND ADHESIVES BASED ON ACRYLATE
The invention relates to a layered construction with a protective layer and a photoexposed photopolymer layer, the protective layer being obtainable by reaction of a mixture comprising or consisting of at least one radiation-curing resin I), a polyfunctional radiation-curing resin II) and a photoinitiator system III), the radiation-curing resin I) comprising ≦5 wt. % of compounds having a weight-average molecular weight <500 and ≧75 wt. % of compounds having a weight-average molecular weight >1000, the polyfunctional radiation-curing resin II) comprising or consisting of at least one acrylate having at least two radiation-curing groups, and the mixture comprising at least 55 wt. % of the radiation-curing resin I) and not more than 35 wt. % of the polyfunctional radiation-curing resin II). The invention further relates to a method for producing a layered construction of this kind, and also to its use.
1 .- 15 . (canceled)
16 . A layered construction with a protective layer and a photoexposed photopolymer layer, wherein the protective layer is obtainable by reaction of a mixture comprising at least one radiation-curing resin I), a polyfunctional radiation-curing resin II) and a photoinitiator system III), the radiation-curing resin I) comprising ≦5 wt. % of compounds having a weight-average molecular weight <500 and ≧75 wt. % of compounds having a weight-average molecular weight >1000, the polyfunctional radiation-curing resin II) comprising at least one acrylate having at least two radiation-curing groups, and the mixture comprises at least 55 wt. % of the radiation-curing resin I) and not more than 35 wt. % of the polyfunctional radiation-curing resin II).
17 . The layered construction according to claim 16 , wherein the photopolymer layer comprises crosslinked matrix polymers A) obtained by reaction of at least one polyisocyanate component a) and an isocyanate-reactive component b), crosslinked writing monomers B), a photoinitiator C) and optionally a catalyst D).
18 . The layered construction according to claim 16 , wherein the radiation-curing resin I) comprises at least one polyester-, polyether-, polycarbonate and/or polyurethane-containing binder having radically polymerizable groups.
19 . The layered construction according to claim 16 , wherein the radiation-curing resin I) comprises at least one compound selected from the group consisting of polyether acrylates, polyester acrylates, aliphatic urethane acrylates, aromatic urethane acrylates and epoxy acrylates.
20 . The layered construction according to claim 16 , wherein the radiation-curing resin I) comprises ≦4 wt. % of compounds having a weight-average molecular weight <500 and ≧77 wt. % of compounds having a weight-average molecular weight >1000.
21 . The layered construction according to claim 16 , wherein the radiation-curing groups of the polyfunctional radiation-curing resin II) are radically polymerizable groups.
22 . The layered construction according to claim 16 , wherein the polyfunctional radiation-curing resin II) consists exclusively of compounds having at least two radiation-curing groups.
23 . The layered construction according to claim 16 , wherein the mixture for producing the protective layer comprises 3 wt. % to 30 wt. % of the polyfunctional radiation-curing resin II).
24 . The layered construction according to claim 16 , wherein the mixture comprises ≦10 wt. % of a radiation-curing resin IV) selected from one or more radiation-curing compounds having radically polymerizable groups.
25 . The layered construction according to claim 24 , wherein the one or more radiation-curing compounds in the radiation-curing resin IV) have a weight-average molecular weight of ≦800 g/mol.
26 . A method for producing a layered construction according to claim 16 , comprising applying a mixture comprising the radiation-curing resin I), the polyfunctional radiation-curing resin II) and the photoinitiator system III) to a photoexposed photopolymer layer and cured the mixture, where the radiation-curing resin I) comprises ≦5 wt. of compounds having a weight-average molecular weight <500 and ≧75 wt. % of compounds having a weight-average molecular weight >1000, the polyfunctional radiation-curing resin II) comprising at least one acrylate having at least two radiation-curing groups, and the mixture comprises at least 55 wt. % of the radiation-curing resin I) and not more than 35 wt. % of the polyfunctional radiation-curing resin II).
27 . The method according to claim 26 , comprising, prior to the curing, covering the mixture with a cover layer.
28 . The method according to claim 26 , wherein the mixture is applied to a transfer surface, and the photopolymer layer is applied to the as yet uncured mixture and pressed on, forming a laminate composed of the protective layer and the photopolymer layer, and removing the laminate from the transfer surface.
29 . The method according to claim 26 , wherein the protective layer is applied in a roll process and is subsequently cured, a smooth or structured surface being produced in the protective layer.
30 . A method comprising utilizing the layered construction according to claim 16 in a label, in a security card, in a banknote, in a printed article, in an optical construction, in an electronic display or an article comprising a multi-layer construction and a holographical optical layer.