US 12,071,288 B2
Gas barrier layered body, and packaging material and tube container using same
Takeshi Nishikawa, Tokyo (JP); Ayumi Tanaka, Tokyo (JP); and Miki Fukugami, Tokyo (JP)
Assigned to TOPPAN INC., Tokyo (JP)
Appl. No. 17/630,072
Filed by TOPPAN INC., Tokyo (JP)
PCT Filed Jul. 22, 2020, PCT No. PCT/JP2020/028532
§ 371(c)(1), (2) Date Jan. 25, 2022,
PCT Pub. No. WO2021/020298, PCT Pub. Date Feb. 4, 2021.
Claims priority of application No. PCT/JP2019/029680 (WO), filed on Jul. 29, 2019.
Prior Publication US 2022/0267067 A1, Aug. 25, 2022
Int. Cl. B65D 65/40 (2006.01); B65D 47/06 (2006.01); C09D 167/02 (2006.01)
CPC B65D 65/40 (2013.01) [B65D 47/06 (2013.01); C09D 167/02 (2013.01); B65D 2565/385 (2013.01); B65D 2565/387 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A gas barrier layered body comprising:
a substrate layer;
a first polyvinyl alcohol-based resin layer;
a Si or Al-containing thin film layer; and
a second polyvinyl alcohol-based resin layer, in stated order,
wherein
the substrate layer contains a polyolefin-based resin and has a thickness of 9 to 100 μm,
the first polyvinyl alcohol-based resin layer has a mass per unit area of 0.1 to 10 g/m2, and a thickness of 0.05 to 5 μm,
the Si or Al-containing thin film layer is a vapor-deposited layer containing at least one of silicon oxide and aluminum oxide, and has a thickness of 5 to 80 nm, and
the second polyvinyl alcohol-based resin layer is a cured product of a raw material containing a polyvinyl alcohol-based resin and a silane compound, and an amount of the silane compound in the raw material is 0.3 to 5.0 parts by mass with respect to 1 part by mass of the polyvinyl alcohol-based resin, the second polyvinyl alcohol-based resin layer having a thickness of 0.05 to 2 μm,
a logarithmic decrement at 100° C. of a surface of the first polyvinyl alcohol-based resin layer on a side that is in contact with the Si or Al-containing thin film layer as measured by a rigid-body pendulum type physical property testing instrument is 0.20 or less and a logarithmic decrement at 125° C. is 0.30 or less, and
an indentation hardness of a surface of the second polyvinyl alcohol-based resin layer as determined by a nanoindenter is 0.5 to 1.0 GPa.