Packaging material for aqueous content and packaging bag for aqueous content

Abstract

A packaging material for an aqueous content is a packaging bag including at least a gas barrier laminate having a paper base material, an anchor coat layer, a vapor-deposited layer and an overcoat layer laminated in this order, in which a mass of the paper base material is 50 mass % or more relative to a total mass of the packaging material, the vapor-deposited layer contains a metal or a metal oxide, the overcoat layer contains a polyolefin having a carboxylic acid base, and the overcoat layer has a thickness of more than 3 μm.

1 . A packaging material for an aqueous content, comprising:
 at least a gas barrier laminate having a paper base material, an anchor coat layer, a vapor-deposited layer and an overcoat layer laminated in this order,   wherein a mass of the paper base material is 50 mass % or more relative to a total mass of the packaging material,   the vapor-deposited layer comprises a metal or a metal oxide,   the overcoat layer comprises a polyolefin having a carboxylic acid base, and   the overcoat layer has a thickness of more than 3 μm.   
     
     
         2 . The packaging material for an aqueous content according to  claim 1 ,
 wherein the anchor coat layer comprises a polyolefin having a carboxylic acid base.   
     
     
         3 . The packaging material for an aqueous content according to  claim 1 ,
 wherein a ratio of the thickness of the overcoat layer to a thickness of the anchor coat layer is 1 to 20.   
     
     
         4 . The packaging material for an aqueous content according to  claim 1 , further comprising:
 a sealant layer provided on a side of the overcoat layer opposite to the vapor-deposited layer.   
     
     
         5 . A packaging bag for an aqueous content obtained by making the packaging material for an aqueous content according to  claim 1  into a bag. 
     
     
         6 . The packaging material for an aqueous content according to  claim 1 ,
 wherein a thickness of the anchor coat layer is 5 μm or less.   
     
     
         7 . The packaging material for an aqueous content according to  claim 1 ,
 wherein the thickness of the overcoat layer is 8 μm or less.   
     
     
         8 . The packaging material for an aqueous content according to  claim 1 ,
 wherein a thickness of the vapor-deposited layer is 10 to 300 nm.   
     
     
         9 . A packaging material for an aqueous content, comprising:
 at least a gas barrier laminate having a paper base material, an anchor coat layer, a vapor-deposited layer and an overcoat layer laminated in this order,   wherein a mass of the paper base material is 75 mass % or more relative to a total mass of the packaging material,   
       the anchor coat layer comprises a polyolefin having a carboxylic acid base,
 the vapor-deposited layer comprises a metal or a metal oxide, and a thickness of the vapor-deposited layer is 10 to 300 nm, 
 the overcoat layer comprises a polyolefin having a carboxylic acid base, 
 
       a thickness of the paper base material is 30 to 70 μm, 
       a thickness of the anchor coat layer is 1 μm or more 5 μm or less, 
       a thickness of the overcoat layer is 3 μm or more and 8 μm or less, and
 a ratio of the thickness of the overcoat layer to the thickness of the anchor coat layer is 1 to 20.