Resin composition for a polarizer protective film, a polarizer protective film, a polarizing plate including the same, and a preparation method of a polarizing plate
The present invention relates to a resin composition for a polarizer protective film, a polarizer protective film, a polarizing plate including the same, and a preparation method of a polarizing plate, and, more specifically, to a resin composition for a polarizer protective film and a polarizer protective film exhibiting high hardness and excellent properties, a polarizing plate including the same, and a preparation method of a polarizing plate. According to the polarizing plate of the present invention, it can be usefully utilized in various fields because of its excellent hardness, flexibility, and optical properties.
1. A polarizing plate, including:
a polarizer; and
a protective film on at least one face of the polarizer, wherein the protective film comprises a cured resin of a multifunctional acrylate monomer and an acrylate oligomer having the elongation of 10 to 50%;
wherein the protective film has a retardation value of 0 to 1 nm,
wherein the acrylate oligomer has 3 to 6 functional groups and is modified with one or more selected from the group consisting of ethylene oxide, propylene oxide, and caprolactone, wherein the weight ratio of the multifunctional acrylate monomer to the acrylate oligomer having the elongation of 10 to 50% is about 2:8 to about 8:2,
wherein the polarizing plate has a pencil hardness of 3H or more under a load of 500 g, and
wherein the protective film has a thickness of 10 to 100 μm.
2. The polarizing plate according to claim 1 , further including inorganic particles which are dispersed in the cured resin.
3. The polarizing plate according to claim 1 , including the protective films on both faces of the polarizer.
4. The polarizing plate according to claim 1 , further including an adhesive layer between the polarizer and the protective film.
5. The polarizing plate according to claim 1 , wherein the polarizer has a thickness of 45 to 250 μm.
6. A preparation method of a polarizing plate, including the steps of:
coating a resin composition including a binder including a multifunctional acrylate monomer and an acrylate oligomer having the elongation of 10 to 50%, and a photoinitiator on a release film; wherein the acrylate oligomer has 3 to 6 functional groups and is modified with one or more selected from the group consisting of ethylene oxide, propylene oxide, and caprolactone, wherein the weight ratio of the multifunctional acrylate monomer to the acrylate oligomer having elongation of 10 to 50% is about 2:8 to about 8:2
forming a protective film by photocuring the coated resin composition, wherein the protective film has a retardation value of 0 to 1 nm, wherein the protective film has a thickness of 10 to 100 μm; and
laminating the protective film on one face of a polarizer to attach the same, wherein the polarizing plate has a pencil hardness of 3H or more under a load of 500 g.
7. The preparation method according to claim 6 , further including the step of peeling off a release film before or after the step of laminating the protective film on one face of the polarizer.