US 12,252,318 B2
Gas-barrier laminate and packaging bag
Rika Ishii, Tokyo (JP); Junichi Kaminaga, Tokyo (JP); Yoshiki Koshiyama, Tokyo (JP); and Yumiko Kojima, Tokyo (JP)
Assigned to TOPPAN Holdings Inc., Tokyo (JP)
Appl. No. 18/004,242
Filed by TOPPAN Holdings Inc., Tokyo (JP)
PCT Filed Jun. 11, 2021, PCT No. PCT/JP2021/022333
§ 371(c)(1), (2) Date Jan. 4, 2023,
PCT Pub. No. WO2022/009608, PCT Pub. Date Jan. 13, 2022.
Claims priority of application No. 2020-118631 (JP), filed on Jul. 9, 2020.
Prior Publication US 2023/0242314 A1, Aug. 3, 2023
Int. Cl. B65D 65/42 (2006.01); B65D 30/08 (2006.01); B65D 30/20 (2006.01); B65D 81/24 (2006.01)
CPC B65D 65/42 (2013.01) [B65D 31/02 (2013.01); B65D 31/10 (2013.01); B65D 81/24 (2013.01); B65D 2565/385 (2013.01); B65D 2565/387 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A gas barrier laminate comprising, in following order:
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,
wherein the gas barrier laminate further comprises a resin layer that includes 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, and
wherein a thickness of the anchor coat layer is 1 μm or more and 5 μm or less, and a thickness of the resin layer is 1 μm or more and 5 μm or less.