Flexible substrate

Abstract

There is provided a flexible substrate having excellent flexibility and gas barrier properties. A flexible substrate 100 according to the present invention includes: a base material 20 including an inorganic glass 10 and resin layers 11 and 11 ′ placed on both sides of the inorganic glass 10 ; and an inorganic thin film 12 placed on a side of one of the resin layers where the inorganic glass is not placed, wherein the inorganic thin film 12 is formed on at least a peripheral edge of one surface of the base material.

1 . A flexible substrate, comprising:
 a base material including an inorganic glass and resin layers placed on both sides of the inorganic glass;   an inorganic thin film placed on a side of one of the resin layers where the inorganic glass is not placed; and   a transparent electrode placed on a side of the inorganic thin film where the resin layers are not placed,   wherein a ratio d rsum /d g  of the total thickness d rsum  of the resin layers to the thickness d g  of the inorganic glass is 0.8 to 2.5,   the inorganic thin film is formed on an entire surface of the one surface of the base material,   the inorganic thin film includes an inorganic compound formed of at least one kind of an element selected from the group consisting of carbon, silicon, aluminum, magnesium, calcium, potassium, tin, sodium, boron, titanium, lead, zirconium, and yttrium, and   the inorganic thin film has a thickness of 1 nm to 300 nm.   
     
     
         2 . A flexible substrate according to  claim 1 , further comprising a smoothing layer, the smoothing layer being placed, between the inorganic thin film and the transparent electrode, on a side of the inorganic thin film where the resin layers are not placed. 
     
     
         3 . A flexible substrate according to  claim 2 , further comprising another inorganic thin film, wherein the another inorganic thin film is placed, between the smoothing layer and the transparent electrode, on a side of the smoothing layer where the resin layers are not placed. 
     
     
         4 . A flexible substrate according to  claim 1 , wherein the flexible substrate has a thickness (total thickness) of 600 μm or less. 
     
     
         5 . A flexible substrate according to  claim 1 , wherein the resin layers are each formed of a resin composition containing an epoxy-based resin and/or an oxetane-based resin as a main component. 
     
     
         6 . A flexible substrate according to  claim 1 , wherein the resin layers each contain a thermoplastic resin having repeating units represented by a general formula (X) and/or a general formula (Y): 
       
         
           
           
               
               
           
         
         where:
 R 1  represents a substituted or unsubstituted aryl group having 6 to 24 carbon atoms, a cycloalkylene group having 4 to 14 carbon atoms, or a linear or branched alkylene group having 1 to 8 carbon atoms; 
 R 2  represents a substituted or unsubstituted aryl group having 6 to 24 carbon atoms, a linear or branched alkyl group having 1 to 8 carbon atoms, a linear or branched alkylene group having 1 to 8 carbon atoms, a cycloalkyl group having 5 to 12 carbon atoms, a cycloalkylene group having 5 to 12 carbon atoms, or a hydrogen atom; 
 R 3  and R 4  each independently represent a linear or branched alkyl group having 1 to 8 carbon atoms, a hydrogen atom, a linear or branched alkylene group having 1 to 8 carbon atoms, a cycloalkyl group having 5 to 12 carbon atoms, or a cycloalkylene group having 5 to 12 carbon atoms; 
 A represents a carbonyl group, or a linear or branched alkylene group having 1 to 8 carbon atoms; 
 m represents an integer of 0 to 8; and 
 n represents an integer of 0 to 4. 
 
       
     
     
         7 . A flexible substrate according to  claim 1 , wherein the resin layers each contain a thermoplastic resin having one or more repeating units represented by a general formula (Z): 
       
         
           
           
               
               
           
         
         where:
 R 1  represents a substituted or unsubstituted aryl group having 6 to 24 carbon atoms, a linear or branched alkylene group having 1 to 8 carbon atoms, or a cycloalkylene group having 4 to 14 carbon atoms, or an oxygen atom; and 
 R 2  represents a substituted or unsubstituted aryl group having 6 to 24 carbon atoms, a linear or branched alkyl group having 1 to 8 carbon atoms, a linear or branched alkylene group having 1 to 8 carbon atoms, a cycloalkyl group having 5 to 12 carbon atoms, a cycloalkylene group having 5 to 12 carbon atoms, or a hydrogen atom. 
 
       
     
     
         8 . A flexible substrate according to  claim 1 , wherein the resin layers each contain a polyether sulfone-based resin. 
     
     
         9 . A flexible substrate according to  claim 1 , wherein the inorganic thin film contains at least one kind of an inorganic compound selected from the group consisting of oxides, nitrides, hydrides, and composite compounds of them. 
     
     
         10 . A flexible substrate according to  claim 9 , wherein the inorganic compound has an amorphous structure. 
     
     
         11 . A flexible substrate according to  claim 1 , wherein the inorganic thin film is of a three-layer configuration having an inorganic oxide layer, an inorganic nitride layer, and an inorganic oxide layer. 
     
     
         12 . An organic electroluminescence display apparatus comprising the flexible substrate according to  claim 1 .