Transparent laminate film and method for producing same

Abstract

A transparent laminate film which has visible light transmittance, sunlight blocking properties, radio wave transmittance and good appearance is provided. A transparent laminate film includes a laminate structure formed on at least one side of a transparent polymer film, in which a metal oxide layer and a metal layer are laminated, the metal oxide layer containing an organic component, wherein grooves having a width of 30 μm or less are formed in the laminate structure, and an overall surface resistance is 150Ω/□ or more. Preferably, the grooves are numerous cracks, or are formed by laser processing. Further, preferably, the transparent polymer film has an easy adhesion layer formed on at least one side thereof, and the laminate structure is formed on top of the easy adhesion layer. Furthermore, preferably, the metal oxide layer containing the organic component is formed by a sol-gel method using optical energy during sol-gel curing.

What is claimed is: 
     
         1 . A method for producing a transparent laminate film, comprising:
 a lamination process forming, on at least one side of a transparent polymer film, a laminate structure in which a metal oxide layer and a metal layer are laminated, the metal oxide layer containing an organic component; and   a groove formation process forming grooves having a width of 30 μm or less in a formed laminate structure so that an overall surface resistance is 150Ω/□ or more.   
     
     
         2 . The method for producing a transparent laminate film according to  claim 1 , wherein formation of the grooves is performed by causing the organic component in the metal oxide layer containing the organic component to react to cause cracks to form due to a stress generated in the laminate structure during the reaction. 
     
     
         3 . The method for producing a transparent laminate film according to  claim 1 , wherein the organic component is a remaining component of a starting material of a sol-gel method, and the formation of the grooves comprises a step applying energy to the laminate structure from a surface thereof in an atmosphere containing one kind or two or more kinds of materials selected from oxygen, ozone, and water. 
     
     
         4 . The method for producing a transparent laminate film according to  claim 1 , wherein the formation of the grooves is performed by subjecting a surface of the laminate structure to laser processing. 
     
     
         5 . A method for producing a transparent laminate film, comprising:
 a lamination process forming, on at least one side of a transparent polymer film, a laminate structure in which a metal oxide layer and a metal layer are laminated, the metal oxide layer containing an organic component; and   a groove formation process forming grooves having a width of 30 μm or less in a formed laminate structure so that an overall surface resistance is 150Ω/□ or more,   wherein the formation of the grooves is performed by stretching of the transparent laminate film.   
     
     
         6 . The method for producing a transparent laminate film according to  claim 5 , wherein the stretching is a biaxial stretching.