Film touch sensor
A film touch sensor includes a base film, an adhesive layer, a separation layer and a conductive pattern layer, which are sequentially laminated. The base film has a retardation value Ro in a plane direction of 0 to 10 nm, and a retardation value Rth in a thickness direction of −10 to 10 nm. When the film touch sensor is applied to a final product, interference between laminates may be minimized to significantly reduce a change in color sense of an image.
1. A film touch sensor comprising:
a base film having a retardation value Ro in a plane direction of 0 to 10 nm, and a retardation value Rth in a thickness direction of −10 to 10 nm;
an adhesive layer formed directly on the base film;
a separation layer formed directly on the adhesive layer;
a conductive pattern layer formed on the separation layer; and
a first protective layer disposed between the separation layer and the conductive pattern layer, the first protective layer being an insulation layer entirely covering a top surface of the separation layer, the first protective layer being an organic layer comprising a polymer, the first protective layer is not in contact with the adhesive layer.
2. The film touch sensor of claim 1 , wherein the base film has a thickness of 5 to 30 μm.
3. The film touch sensor of claim 1 , wherein the base film has a water contact angle of 20 to 50°.
4. The film touch sensor of claim 1 , wherein the base film has a transmittance of 90% or more.
5. The film touch sensor of claim 1 , wherein the base film includes at least one material selected from the group consisting of polyethyleneetherphthalate, polyethylenenaphthalate, polycarbonate, polyarylate, polyetherimide, polyethersulfonate, polyimide, polyetheretherketone, polyethylene terephthalate, triacetyl cellulose, cyclo-olefin polymer, aramide, FRP, polyurethane, polyacrylate, and polydimethylsiloxane.
6. The film touch sensor of claim 1 , wherein the adhesive layer has an adhesiveness of 2 N/25 mm or more.
7. The film touch sensor of claim 1 , wherein the adhesive layer has a chromaticity b* of −1 to +1.
8. The film touch sensor of claim 1 , wherein the adhesive layer has a transmittance of 95 to 100%.
9. The film touch sensor of claim 1 , wherein the adhesive layer is formed from a radical-curable adhesive composition.
10. The film touch sensor of claim 9 , wherein the adhesive layer has an elastic modulus of 1×10 5 to 1×10 9 Pa.
11. The film touch sensor of claim 9 , wherein the adhesive layer has an elastic modulus of 1×10 5 to 1×10 7 Pa.
12. The film touch sensor of claim 1 , wherein the adhesive layer is formed of a cation-curable adhesive composition.
13. The film touch sensor of claim 12 , wherein the adhesive layer has an elastic modulus of 1×10 8 to 1×10 10 Pa.
14. The film touch sensor of claim 1 , wherein the adhesive layer is formed of an adhesive composition including a radical-curable compound and a cation-curable compound.
15. The film touch sensor of claim 14 , wherein the adhesive layer has an elastic modulus of 1×10 7 to 1×10 9 Pa.
16. The film touch sensor of claim 1 , further comprising an optical functional layer disposed on the conductive pattern layer,
wherein the optical functional layer includes at least one selected from the group consisting of a retardation film, a polarizer, a cover window film, a scattering-preventive film, and a protective film.
17. The film touch sensor of claim 1 , further comprising a refractive index matching layer disposed between the separation layer and the conductive pattern layer.
18. A touch screen panel comprising the film touch sensor of claim 1 .
19. An image display device comprising the touch screen panel of claim 18 .