Polarizer having protection films in two sides and optical device comprising the same
A double-sided polarizer includes a polarizing film, a first adhesive layer formed on one surface of the polarizing film, a second adhesive layer formed on the other surface of the polarizing film, a first transparent film formed on the first adhesive layer, and a second transparent film formed on the second adhesive layer, wherein the first adhesive layer and the second adhesive layer are formed of an active energy line-curable adhesive and the first adhesive layer is 0.1 μm to 3 μm thick, and there is also provided an optical device including the double-sided polarizer.
1. A double-sided polarizer comprising: a polarizing film; a first adhesive layer formed on one surface of the polarizing film; a second adhesive layer formed on the other surface of the polarizing film; a first transparent film formed on the first adhesive layer; and a second transparent film formed on the second adhesive layer,
wherein the first adhesive layer and the second adhesive layer are formed of an active energy line-curable adhesive, and the first adhesive layer is 0.1 μm to 3 μm thick,
wherein the first adhesive layer and the second adhesive layer are formed of a cationic adhesive, and the cationic adhesive includes: (1) 5 wt % to 90 wt % of an epoxy compound which is a combination of a first epoxy compound including one or more epoxidized aliphatic ring group and a second epoxy compound including one or more glycidyl ether group; (2) 5 wt % to 90 wt % of an oxetane compound having at least one oxetanyl group in a molecule; and (3) 0.5 wt % to 20 wt % of a cationic photo-polymerization initiator,
wherein the first epoxy compound and the second epoxy compound have a weight ratio of 1:1 to 3:1, and
wherein a weight of the first epoxy compound is more than or equal to a weight of the second epoxy compound.
2. The double-sided polarizer of claim 1 , wherein the second adhesive layer is 0.1 μm to 10 μm thick.
3. The double-sided polarizer of claim 1 , wherein the irradiating of the active energy line is performed through an active energy source positioned in the direction of the transparent film formed on the second adhesive layer.
4. The double-sided polarizer of claim 1 , wherein the cationic adhesive further comprises one or more selected from the group consisting of a silane coupling agent, a vinyl compound, and a radical polymerization monomer.
5. The double-sided polarizer of claim 1 , further comprising a primer layer at least between the first adhesive layer and the first transparent film or between the second adhesive layer and the second transparent film.
6. The double-sided polarizer of claim 5 , wherein the primer layer is formed of a primer composition including 1 part to weight to 50 parts by weight of a urethane polymer, 0.1 part by weight to 10 parts by weight of a water-dispersed fine particles, and the balance of water.
7. The double-sided polarizer of claim 6 , wherein the primer composition further comprises a cross-linking agent.
8. The double-sided polarizer of claim 5 , wherein the primer layer is 100 nm to 1 μm thick.
9. The double-sided polarizer of claim 1 , wherein at least one of the first transparent film and the second transparent film is an acrylic film.
10. An optical device comprising a double-sided polarizer of claim 1 .