Gas barrier film

Patent metadata

Field	Value
Publication number	US-11780978-B2
Application number	US-202117339078-A
Country	US
Kind code	B2
Filing date	Jun 4, 2021
Priority date	Dec 6, 2018
Publication date	Oct 10, 2023
Grant date	Oct 10, 2023

Abstract

A gas barrier film including a substrate film containing a resin, and a gas barrier layer that has oxygen barrier properties and is in contact with at least one surface of the substrate film, a surface of the gas barrier layer has a flat portion, and a plurality of protrusions that protrude from the flat portion. The number of protrusions that satisfy the following formula (1) is 0 to 200 per mm 2 , and the number of protrusions that satisfy the following formula (2) is 20 or more per mm 2 ; d×2≤f(1); and 0.2≤f<d×2(2), where d represents a thickness (μm) of the gas barrier layer, and f represents a height (μm) of each of the plurality of protrusions.

First claim

What is claimed is:

1. A gas barrier film, comprising:
a substrate film containing a resin; and
a gas barrier layer that has oxygen barrier properties and is located in contact with at least one surface of the substrate film, wherein:
a surface of the gas barrier layer has
a flat portion, and
a plurality of protrusions that protrude from the flat portion; and
the number of protrusions that satisfy the following formula (1) is 0 to 100 per mm 2 , and
the number of protrusions that satisfy the following formula (2) is 20 to 200 per mm 2 :
d× 2≤ f   (1); and

0.2≤ f<d× 2  (2),

where d represents a thickness (μm) of the gas barrier layer, and f represents a height (μm) of each of the plurality of protrusions.

2. The gas barrier film of claim 1 , wherein the protrusions that satisfy the formula (2) have a diameter of 0.4 to 10 μm in a cross section at a height of 0.2 μm.

3. The gas barrier film of claim 1 , wherein:
the substrate film further contains an anti-blocking agent; and
the protrusions are derived from the anti-blocking agent.

4. The gas barrier film of claim 1 , wherein the gas barrier layer is a film made of a coating agent containing a water-soluble polymer and an inorganic layered mineral.

5. The gas barrier film of claim 4 , wherein the coating agent further contains an aqueous polyurethane resin containing a polyurethane resin having an acid group and a polyamine compound.

6. The gas barrier film of claim 1 , wherein the substrate film is a polyolefin resin film, a polyester resin film, or a polyamide resin film.

7. The gas barrier film of claim 1 , wherein the thickness of the gas barrier layer is 0.3 to 1 μm.

8. The gas barrier film of claim 1 , wherein the number of protrusions that satisfy the formula (1) is 3 to 92 per mm 2 ;
the number of protrusions that satisfy the following formula (2) is 77 to 187 per mm 2 ; and
the thickness of the gas barrier layer is 0.5 to 0.8 μm.

9. A gas barrier film, comprising:
a substrate film containing a resin; and
a gas barrier layer which is an oxygen barrier film formed by a wet coating method and is located in contact with at least one surface of the substrate film, wherein:
the surface of the substrate film that is in contact with the gas barrier layer has a flat portion and a plurality of protrusions that protrude from the flat portion; and
in a randomly selected region of 0.66 mm 2 or more on the surface of the substrate film in contact with the gas barrier layer, measuring a height of each of the plurality of protrusions by using a 3D measurement laser microscope, a thickness t(μm) of the gas barrier layer satisfies the following formula (3):
0.25× h+ 0.15≤ t≤ 0.8× h   (3),

where h represents an average height (μm) of protrusions having a height of 0.3 μm to 1.5 μm.

10. The gas barrier film of claim 9 , wherein on the surface of the substrate film in contact with the gas barrier layer, the number of protrusions having a height of 5 times or more that of a thickness of the gas barrier layer is 10 or less per mm 2 .

11. The gas barrier film of claim 9 , wherein:
the substrate film further contains an anti-blocking agent; and
the protrusions are derived from the anti-blocking agent.

12. The gas barrier film of claim 9 , wherein the gas barrier layer is a film made of a coating agent containing a water-soluble polymer and an inorganic layered mineral.

13. The gas barrier film of claim 12 , wherein the coating agent further contains an aqueous polyurethane resin containing a polyurethane resin having an acid group, and a polyamine compound.

14. The gas barrier film of claim 9 , wherein the substrate film is a polyolefin resin film, a polyester resin film, or a polyamide resin film.

15. The gas barrier layer of claim 9 , wherein the thickness of the gas barrier is 0.4 to 1.0 μm.

16. The gas barrier layer of claim 11 , wherein the thickness of the gas barrier is 0.4 to 1.0 μm.

Assignees

• Toppan Printing Co Ltd

Inventors

• Kaminaga Junichi
• HOSHI Sayaka
• OMURA Yuki
• Suzuki Seiya
• Koshiyama Yoshiki

Classifications

• C08J7/048 Primary

  Forming gas barrier coatings · CPC title

• B65D65/42

  Applications of coated or impregnated materials · CPC title

• C08J5/18

  Manufacture of films or sheets · CPC title

• C08J7/0427

  with only one layer of a composition containing a polymer binder (with more layers C08J7/042) · CPC title

• C09D7/61

  inorganic · CPC title