Patent ID: 7214431
Filing Date: 2007-05-08
Classification: C03C,C08F,C08G,C09D,Y10T

Abstract:
1. A two-layer film comprising a first layer of a radiation-cured resin composition, and a second layer of a radiation-cured resin composition which is applied onto the first layer, wherein the cured resin composition of each of the first and second layers comprises (1) 30–80 wt % of one or more oligomers wherein at least one oligomer is a urethane (meth)acrvlate oligomer: (2) 0.01–10 wt % of a photoinitiator, and (3) 10–70 wt % of one or more polymerizable diluents comprising a polymerizable monofunctional and/or polyfunctional vinyl monomer, wherein the wt % of components (1), (2) and (3) are relative to the combined weight of the components (1), (2) and (3); wherein the photoinitiator (2) of the first layer consists solely of 2-methyl-i-[4-methylthiophenyl]-2-morpholino-propan-1 -one; and wherein the photoinitiator (2) of the second layer consists of 2-methyl-i-[4-methylthiophenyl]2-morpholino-propan-1-one, and at least one other photoinitiator selected from the group consisting of 1-hydoxycyclohexy phenyl ketone, 2,2-dimethoxy-2-phenylacetophenone, xanthone, fluorenone, benzaldehyde, fluorene, anthraquinone, triphenylamine, carbazole, 3-methylacetophenone, 4-chlorobenzophenone, 4,4′-dimethoxybenzophenone, 4,4′-diaminobenzophenone, Micheler's ketone, benzoin propyl ether, benzoin ethyl ether, benzyl methyl ketal, 1-(4-isopropylphenyl)-2-hydroxy-2-methylpropan-1-one, 2-hydroxy-2-methyl-1-phenylpropan-1-one, thioxanthone, diethylthioxanthone, 2-isopropylthioxanthone, 2-chlorothioxanthone, 2,4,6-trimethylbenzoyldiphenylphosphine oxide, and bis-(2,6-dimethoxybenzoyl)˜2,4,4-trimethylpentylphosphine oxide; and wherein the second layer is separable from the first layer and exhibits a T-peel strength of about 1.8 g/cm or less.