Film touch sensor and method for fabricating the same
A film touch sensor includes a separation layer, a protective layer which is disposed on the separation layer and is a cured layer of a polymer having a repeating unit represented by Formula 1 or 2, and an electrode pattern layer disposed on the protective layer, such that it is possible to suppress thermal damage such as wrinkles, or cracks of an protective layer, which may occur in high-temperature deposition and annealing processes, and significantly reduce an occurrence rate of cracks during peeling-off the same from a carrier substrate.
1. A film touch sensor comprising:
a separation layer;
a protective layer which is disposed on the separation layer and is a cured layer of a polymer having a repeating unit represented by Formula 1 or 2 below; and
an electrode pattern layer disposed on the protective layer:
wherein at least one of R 1 to R 4 is —X n —Y 1 , n is 0 or 1, X is an alkylene group or a carbonyl group having 1 to 6 carbon atoms, Y 1 is a protonic polar group, the others of R 1 to R 4 is hydrogen or —X n —Y 2 , Y 2 is an alkyl group having 1 to 6 carbon atoms, an aryl group having 6 to 12 carbon atoms, or a protonic polar group, wherein the Y 2 may be substituted with an alkyl group having 1 to 4 carbon atoms or an aryl group having 6 to 12 carbon atoms, and m is an integer of 0 to 2; and
wherein R 5 and R 6 are connected with each other to form a 3-membered or 5-membered hetero ring which may be substituted with an alkyl group having 1 to 4 carbon atoms or an aryl group having 6 to 12 carbon atoms, and k is an integer of 0 to 2.
2. The film touch sensor according to claim 1 , wherein the polymer has a glass transition temperature of 100° C. or higher.
3. The film touch sensor according to claim 1 , wherein the protective layer has an elastic modulus of 2.8 to 4.5 GPa.
4. The film touch sensor according to claim 1 , wherein the protective layer has a transmittance of 90% or more.
5. The film touch sensor according to claim 1 , further comprising a base film attached to an upper side of the electrode pattern layer.
6. An image display device comprising the film touch sensor according to claim 1 .
7. A method for fabricating a film touch sensor, the method comprising:
forming a separation layer on a carrier substrate;
applying a protective layer forming composition which contains a polymer having a repeating unit represented by Formula 1 or 2 below on the separation layer and curing the same to form a protective layer thereon;
forming an electrode pattern layer on the protective layer; and
peeling-off the separation layer from the carrier substrate:
wherein at least one of R 1 to R 4 is —X n —Y 1 , n is 0 or 1, X is an alkylene group or a carbonyl group having 1 to 6 carbon atoms, Y 1 is a protonic polar group, the others of R 1 to R 4 is hydrogen or —X n —Y 2 , Y 2 is an alkyl group having 1 to 6 carbon atoms, an aryl group having 6 to 12 carbon atoms, or a protonic polar group, wherein the Y 2 may be substituted with an alkyl group having 1 to 4 carbon atoms or an aryl group having 6 to 12 carbon atoms, and m is an integer of 0 to 2; and
wherein R 5 and R 6 are connected with each other to form a 3-membered or 5-membered hetero ring which may be substituted with an alkyl group having 1 to 4 carbon atoms or an aryl group having 6 to 12 carbon atoms, and k is an integer of 0 to 2.
8. The method for fabricating a film touch sensor according to claim 7 , wherein the curing of the protective layer forming composition is performed including pre-bake and post-bake.
9. The method for fabricating a film touch sensor according to claim 8 , wherein the post-bake is performed at 180° C. to 250° C. for 20 minutes to 50 minutes.