Transparent conductive film and coating composition therefor

Abstract

The disclosed is a transparent conductive film that includes a matrix and carbon fibrous structures added to the matrix, wherein the carbon fibrous structures comprise carbon fibers, each having an outside diameter of 15-100 nm, and wherein the carbon fibrous structures each comprise a granular part at which two or more carbon fibers are bound to each other, and wherein the granular part is concurrently produced in a growth process for the carbon fibers. When the transparent conductive film is formed at a thickness of 0.1-5 μm on a glass substrate, it shows a surface resistivity of not more than 1.0×10 12 Ω/□, and a total light transmittance of not less than 30%. A coating composition for the conductive transparent film is prepared by using a media mill equipped with beads having an average diameter of 0.05-1.5 mm to disperse the carbon fibrous structures into the liquid resinous composition.

1 . A transparent conductive film, comprising a matrix resin and carbon fibrous structures added to the matrix, wherein the carbon fibrous structures comprise carbon fibers, each having an outside diameter of 15-100 nm, and wherein the carbon fibrous structures each comprise a granular part at which two or more carbon fibers are bound to each other, and wherein the granular part is produced in a growth process for the carbon fibers.  
     
     
         2 . The transparent conductive film according to  claim 1 , wherein the carbon fibrous structures are added at an amount in the range of 1 to 25 parts by weight based on 100 parts by weight of the matrix.  
     
     
         3 . The transparent conductive film according to  claim 1 , wherein the transparent conductive film has a surface resistivity of not more than 1.0×10 12 Ω/□, and a total light transmittance of not less than 30%, when the transparent conductive film is formed at a thickness of 0.1-5 μm on a glass substrate.  
     
     
         4 . A coating composition for a transparent conductive film, comprising a liquid resinous composition and carbon fibrous structures dispersed into the resinous composition, wherein the carbon fibrous structures comprise carbon fibers each having an outside diameter of 15-100 nm, and wherein the carbon fibrous structures each comprise a granular part at which two or more carbon fibers are bound to each other, and wherein the granular part is produced in a growth process for the carbon fibers.  
     
     
         5 . The coating composition according to  claim 4 , wherein the resinous composition comprises a resin as a non-volatile vehicle.  
     
     
         6 . The coating composition according to  claim 4 , wherein the carbon fibrous structures are added at an amount in the range of 1 to 25 parts by weight based on 100 parts by weight of the liquid resinous composition.  
     
     
         7 . The coating composition according to  claim 4 , wherein the coating composition is prepared by using a media mill equipped with beads having an average diameter of 0.05-1.5 mm to disperse the carbon fibrous structures into the liquid resinous composition.  
     
     
         8 . The coating composition according to  claim 7 , wherein the coating composition is prepared by using a high-shear type distributor prior to dispersing the carbon fibrous structures using the media mill.