Toppan Holdings Inc.

Rika Ishii

Junichi Kaminaga

Yoshiki Koshiyama

Yumiko Kojima

Provided is a gas barrier laminate being capable of hermetic sealing by heat sealing, and having a paper substrate and a vapor-deposited layer, in which the paper substrate has a basis weight of 30 to 100 g/m, the water vapor transmission rate is 3 g/m/d or less at 40° C. and 90% RH, the water vapor transmission rate obtained by folding the gas barrier laminate with the paper substrate placed on the outer side, rolling a roller having a weight of 2 kg thereon one time, opening a fold, and making measurement, is 4 g/m/d or less at 40° C. and 90% RH, and the water vapor transmission rate obtained by folding the gas barrier laminate with the paper substrate placed on the inner side, rolling a roller having a weight of 2 kg thereon one time, opening a fold, and making measurement, is 4 g/m/d or less at 40° C. and 90% RH.

Gas barrier laminate and packaging bag

Provided is a gas barrier laminate including: a paper substrate; an anchor coat layer including a first polyolefin having a polar group; a vapor-deposited layer; and an overcoat layer including a second polyolefin having a polar group, in order, in which the gas barrier laminate includes a layer including a polyvinyl alcohol-based resin between the paper substrate and the anchor coat layer or between the anchor coat layer and the vapor-deposited layer.

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Tokyo, Japan

Rika Ishii