Barrier paper, container and lid member containing said barrier paper, and method for producing barrier paper

Abstract

Provided is barrier paper excellent in gas barrier properties, with respect to barrier paper including a paper substrate layer. Barrier paper comprising a paper substrate layer, an adhesive layer, and an inorganic vapor-deposited layer in this order, the adhesive layer being in contact with the inorganic vapor-deposited layer. In the barrier paper, when the arithmetic average roughness of the surface of the inorganic vapor-deposited layer on the side opposite to the paper substrate layer is defined as Ra1, and the standard deviation of the Ra1 is defined as σRa1, σRa1 is preferably 0.030 μm or less.

1 . Barrier paper comprising a paper substrate layer, an adhesive layer, and an inorganic vapor-deposited layer in this order, the adhesive layer being in contact with the inorganic vapor-deposited layer. 
     
     
         2 . The barrier paper according to  claim 1 , wherein, when the arithmetic average roughness of the surface of the inorganic vapor-deposited layer on the side opposite to the paper substrate layer is defined as Ra1, and the standard deviation of the Ra1 is defined as σRa1, σRa1 is 0.030 μm or less. 
     
     
         3 . The barrier paper according to  claim 1 , wherein, when the arithmetic average roughness of the surface of the inorganic vapor-deposited layer on the side opposite to the paper substrate layer is defined as Ra1, the Ra1 is 0.100 μm or less. 
     
     
         4 . The barrier paper according to  claim 1 , wherein, when the kurtosis of the roughness curve of the surface of the inorganic vapor-deposited layer on the side opposite to the paper substrate layer is defined as Rku1, Rku1 is more than 3.0. 
     
     
         5 . The barrier paper according to  claim 1 , comprising a sealing layer between the paper substrate layer and the adhesive layer. 
     
     
         6 . The barrier paper according to  claim 1 , comprising one or more layers selected from a release layer, a protective layer, a heat seal layer, and a sealant layer on the side of the inorganic vapor-deposited layer opposite to the adhesive layer. 
     
     
         7 . The barrier paper according to  claim 1 , comprising a printing layer on the side of the paper substrate layer opposite to the adhesive layer. 
     
     
         8 . The barrier paper according to  claim 1 , wherein the thickness of the adhesive layer is 1 μm or more and 20 μm or less. 
     
     
         9 . The barrier paper according to  claim 1 , wherein the standard deviation of the thickness of the adhesive layer is 0.80 μm or less. 
     
     
         10 . The barrier paper according to  claim 1 , wherein the coefficient of variance of the thickness of the adhesive layer is 0.17 or less. 
     
     
         11 . The barrier paper according to  claim 1 , wherein the thickness proportion of the paper substrate layer in the barrier paper is 60% or more and less than 100%. 
     
     
         12 . The barrier paper according to  claim 1 , wherein the interlayer adhesion strength between the adhesive layer and the inorganic vapor-deposited layer corresponds to any of the classes 0, 1, and 2 in a crosscut test according to JIS K5600-5-6. 
     
     
         13 . A container comprising the barrier paper according to  claim 1 . 
     
     
         14 . A lid comprising the barrier paper according to  claim 1 . 
     
     
         15 . A method for producing barrier paper comprising steps 1 to 2 below:
 Step 1: a step of bonding an inorganic vapor-deposited layer donor comprising an inorganic vapor-deposited layer on a support having mold-releasability to a paper substrate layer with an adhesive layer interposed therebetween to prepare a barrier paper intermediate, wherein in step 1, the inorganic vapor-deposited layer donor is disposed such that the surface on the side having the inorganic vapor-deposited layer faces toward the paper substrate layer side with reference to the support having mold-releasability; and   Step 2: a step of releasing the support having mold-releasability from the barrier paper intermediate obtained in step 1 to obtain barrier paper described as follows:   barrier paper comprising a paper substrate layer, an adhesive layer, and an inorganic vapor-deposited layer in this order, the adhesive layer being in contact with the inorganic vapor-deposited layer.