RADIATION-CURABLE HARD-COAT COMPOSITION
A radiation-curable hard-coat composition includes a principal resin that includes multi-(meth)acrylate functionalized oligomers or polymers and a free radical-polymerization initiator. The initiator includes at least two photo-initiators in a predetermined ratio that generate a highly reactive species when irradiated with radiation.
1 . A radiation-curable hard-coat composition comprising:
a principal resin comprising multi-(meth)acrylate functionalized oligomers or polymers; and
a free radical-polymerization initiator comprising at least two photo-initiators in a predetermined ratio that generate a highly reactive species when irradiated with radiation.
2 . The composition of claim 1 , where at least one multi-(meth)acrylate functionalized oligomers or polymers is at least 4 functional groups of the principal resin.
3 . The composition of claim 1 , wherein principal resin content as a percentage of weight of the composition is in a range between 5 percent and 96 percent.
4 . The composition of claim 1 , wherein free radical-polymerization initiator content as a percentage of weight of the composition is in a range between 2 percent and 8 percent.
5 . The composition of claim 1 , wherein free radical-polymerization initiator content as a percentage of weight of the composition is 4.5 percent.
6 . The composition of claim 1 , wherein the at least two photo-initiators comprise 1-hydroxycyclohexyl phenyl ketone and diphenyl(2,4,6-trimethylbenzoyl)phosphine oxide.
7 . The composition of claim 6 , wherein the predetermined ratio of 1-hydroxycyclohexyl phenyl ketone to diphenyl(2,4,6-trimethylbenzoyl)phosphine oxide is 3 to 1 by weight.
8 . The composition of claim 6 , wherein the predetermined ratio of 1-hydroxycyclohexyl phenyl ketone to diphenyl(2,4,6-trimethylbenzoyl)phosphine oxide is 4 to 1 by weight.
9 . The composition of claim 1 , wherein the at least two photo-initiators are selected to provide absorption in a range between 200 nanometer and 480 nanometers.
10 . The composition of claim 1 , wherein the at least two photo-initiators are selected to minimize spectral interference.
11 . The composition of claim 1 , wherein the at least two photo-initiators are selected to provide effective curing in a single UV irradiation cycle.
12 . The composition of claim 1 , wherein the mutli-(meth)acrylate functionalized oligomers or polymers are derived from a polyol backbone.
13 . The composition of claim 1 , wherein the mutli-(meth)acrylate functionalized oligomers or polymers are derived from a polyester backbone.
14 . The composition of claim 1 , wherein the mutli-(meth)acrylate functionalized oligomers or polymers are derived from a polyurethane backbone.
15 . The composition of claim 1 , wherein the mutli-(meth)acrylate functionalized oligomers or polymers are derived from a polyether backbone.
16 . The composition of claim 1 , wherein the mutli-(meth)acrylate functionalized oligomers or polymers are derived from an epoxy backbone.
17 . The composition of claim 1 , wherein the mutli-(meth)acrylate functionalized oligomers or polymers are derived from an acrylic backbone.
18 . The composition of claim 1 , wherein the at least two photo-initiators comprise one or more deep curing agents and one or more surface curing agents.
19 . The composition of claim 1 , further comprising a solvent.
20 . The composition of claim 19 , wherein the solvent comprises cyclopentanone.
21 . The composition of claim 19 , wherein solvent content as a percentage of weight of the composition is in a range between 10 percent and 90 percent.