Gas barrier film

Abstract

[Problem] The purpose of the present invention is to provide a gas barrier film having high gas barrier performance and excellent repeated reproducibility of gas barrier performance. [Solution] A gas barrier film comprising a polymer base, an undercoat layer that contains, as the main component, an acrylic resin having at least one side chain selected from the group consisting of the side chains (I) to (III) mentioned below, and an inorganic layer, wherein the undercoat layer and the inorganic layer are arranged in this order on at least one surface of the polymer base in such a manner that the undercoat layer and the inorganic layer are in contact with each other: (I) a side chain having an acrylic polymer skeleton; (II) a side chain having a dimethylsioxane skeleton; and (III) a side chain having a skeleton containing a fluorine atom.

1 . A polymer base laminated, at least on one surface thereof, with an undercoat layer containing, as the primary component, an acrylic resin having at least one side chain selected from the group consisting of (I) to (III) given below and an inorganic layer stacked in contact with each other in this order:
 (I) a side chain having an acrylic polymer skeleton,   (II) a side chain having a dimethyl siloxane skeleton,   (III) a side chain having a fluorine atom-containing skeleton.   
     
     
         2 . Gas barrier film as described in  claim 1 , wherein the side chain contains at least (II) and/or (III) given above. 
     
     
         3 . Gas barrier film as described in  claim 1 , wherein the acrylic resin has a structure produced by copolymerizing an acrylic monomer and at least one macromonomer selected from the group consisting of (i) to (iii) given below:
 (i) a macromonomer including an acrylic polymer having a radically polymerizable group at an end thereof,   (ii) a macromonomer including a dimethyl siloxane skeleton-based polymer having a radically polymerizable group at an end thereof,   (iii) a macromonomer including a fluorine atom-containing polymer having a radically polymerizable group at an end thereof.   
     
     
         4 . Gas barrier film as described in  claim 3 , wherein the macromonomer contains at least (ii) or (iii) given above. 
     
     
         5 . Gas barrier film as described in  claim 1 , wherein the undercoat layer has a surface free energy of 10 to 45 mN/m. 
     
     
         6 . Gas barrier film as described in  claim 1 , wherein the undercoat layer has a surface free energy of 10 to 25 mN/m. 
     
     
         7 . Gas barrier film as described in  claim 3 , wherein the acrylic resin is one produced by copolymerizing 100 parts by mass of the acrylic monomer having a composition as described below with 3 to 8 parts by mass of a macromonomer;
 1 to 8 mass % of methacrylic acid,   5 to 16 mass % of 2-hydroxyethyl methacrylate, and   76 to 94 mass % of methyl methacrylate and/or dicyclopentanyl methacrylate.   
     
     
         8 . Gas barrier film as described in  claim 1 , wherein the inorganic layer has a thickness of 10 to 1,000 nm and comprises a zinc compound and a silicon oxide. 
     
     
         9 . Gas barrier film as described in  claim 8 , wherein the inorganic layer is either a layer [Bl] or a layer [B2] as specified below:
 layer [Bl]: a layer of a phase in which zinc oxide, silicon dioxide, and aluminum oxide coexist,   layer [B2]: a layer of a phase in which zinc sulfide and silicon dioxide coexist.   
     
     
         10 . Gas barrier film as described in  claim 9 , wherein the inorganic layer is a layer [Bl] as specified above and the layer [Bl] has a, zinc (Zn) atom concentration of 20 to 40 atom %, a silicon (Si) atom concentration of 5 to 20 atom %, an aluminum (A1) atom concentration of 0.5 to 5 atom %, and an oxygen (O) atom concentration of 35 to 70 atom % as determined by ICP emission spectroscopy analysis. 
     
     
         11 . Gas barrier film as described in  claim 9 , wherein the inorganic layer is a layer [B2] as specified above and the layer [B2] has a composition in which zinc sulfide accounts for a mole fraction of 0.7 to 0.9 of the total quantity of zinc sulfide and silicon dioxide. 
     
     
         12 . Gas barrier film as described in  claim 1 , wherein the inorganic layer has a surface roughness Ra of 2 nm or less. 
     
     
         13 . A production method for gas barrier film comprising:
 producing, at least on one of the surfaces of a polymer base, an undercoat layer containing, as the primary component, an acrylic resin produced by copolymerizing an acrylic monomer and at least one macromonomer selected from the group consisting of (i) to (iii) given below, and   forming an inorganic layer on the undercoat layer:   
       (i) a macromonomer including an acrylic polymer having a radically polymerizable group at an end thereof, 
       (ii) a macromonomer including a dimethyl siloxane skeleton-based polymer having a radically polymerizable group at an end thereof, 
       (iii) a macromonomer including a fluorine atom-containing polymer having a radically polymerizable group at an end thereof.