Laminate and packaging bag

Abstract

A laminate including a base paper and a gas barrier resin layer provided directly on the base paper, in which a binder resin contained in the gas barrier resin layer includes at least one selected from the group consisting of polyolefin resins and polyvinyl alcohol-based resins, the gas barrier resin layer contains an inorganic pigment in a first region extending from a surface thereof on the base paper side to 50% of the total thickness of the gas barrier resin layer, and 80% by volume or more of the total amount of the inorganic pigment contained in the gas barrier resin layer is present in the first region.

What is claimed is: 
     
         1 . A laminate comprising a base paper and a gas barrier resin layer provided directly on the base paper,
 wherein a binder resin contained in the gas barrier resin layer includes at least one selected from the group consisting of polyolefin resins and polyvinyl alcohol-based resins,   the gas barrier resin layer contains an inorganic pigment in a first region extending from a surface thereof on the base paper side to 50% of the total thickness of the gas barrier resin layer, and   80% by volume or more of the total amount of the inorganic pigment contained in the gas barrier resin layer is present in the first region.   
     
     
         2 . The laminate of  claim 1 , further comprising a vapor-deposited inorganic layer on a surface of the gas barrier resin layer opposite to that facing the base paper. 
     
     
         3 . The laminate of  claim 2 , further comprising an overcoat layer on a surface of the vapor-deposited inorganic layer opposite to that facing the gas barrier resin layer. 
     
     
         4 . The laminate of  claim 3 , wherein the overcoat layer contains a polyolefin resin. 
     
     
         5 . The laminate of  claim 1 , wherein the content of the inorganic pigment in the gas barrier resin layer is 50 parts by volume or less relative to 100 parts by volume of the binder resin. 
     
     
         6 . The laminate of  claim 1 , wherein the content of the inorganic pigment in the first region is 2 to 200 parts by volume relative to 100 parts by volume of the binder resin in the first region. 
     
     
         7 . The laminate of  claim 1 , wherein the inorganic pigment has an aspect ratio of 1 to 200. 
     
     
         8 . The laminate of  claim 1 , wherein 100% by volume of the inorganic pigment contained in the gas barrier resin layer is present in the first region. 
     
     
         9 . The laminate of  claim 1 , wherein a surface of the gas barrier resin layer opposite to that facing the base paper has a surface roughness Ra of 1.0 μm or less. 
     
     
         10 . The laminate of  claim 1 , wherein the gas barrier resin layer has a thickness of 1 to 20 μm. 
     
     
         11 . The laminate of  claim 1 , wherein the gas barrier resin layer has a thickness of 3 to 5 μm. 
     
     
         12 . A packaging bag comprising the laminate of  claim 1 .