Gas barrier film

Patent metadata

Field	Value
Publication number	US-11535437-B2
Application number	US-201816144399-A
Country	US
Kind code	B2
Filing date	Sep 27, 2018
Priority date	Apr 1, 2016
Publication date	Dec 27, 2022
Grant date	Dec 27, 2022

Abstract

A gas barrier film that includes at least a film base material including a polyester resin having a butylene terephthalate unit as a main constituent unit, and one or more metal oxide layers wherein the gas barrier film has a heat shrinkage rate in the machine direction (MD direction) after heating for 30 minutes at 150° C. of 0.6% or more but less than 3.0%, the heat shrinkage rate being represented by the following formula: Heat shrinkage rate={(Length before heating−Length after heating)/Length before heating}×100(%).

First claim

What is claimed is:

1. A gas barrier film, comprising:
a single layer polyester resin film base material consisting of polybutylene terephthalate or a mixture of polybutylene terephthalate and polyethylene terephthalate with a content of the polybutylene terephthalate in the mixture being 60% mass or more, the polyester resin film base material has a first surface and a second surface, which is opposite to the first surface;
an anchor layer directly on the first surface of the single layer polyester resin film base material;
an AlO x layer or a SiO x layer having a thickness of no less than 5 nm and no greater than 100 nm directly on the anchor layer; and
a gas barrier protective layer on the AlO x layer or on the SiO x layer, the gas barrier protective layer comprises a hydrolysate of a metal alkoxide and polyvinyl alcohol,
wherein the gas barrier film has a heat shrinkage rate in the machine direction (MD direction) after heating for 30 minutes at 150° C. of 0.6% or more but less than 3.0%, the heat shrinkage rate being represented by the following formula:
Heat shrinkage rate={(Length before heating−Length after heating)/Length before heating}×100(%).

2. The gas barrier film of claim 1 , wherein a thickness of the film base material is no less than 6 μm and no greater than 200 μm.

3. The gas barrier film of claim 1 , wherein a puncture strength of the film base material is 8.5 N or more.

4. The gas barrier film of claim 1 , wherein the metal alkoxide is tetraethoxysilane.

5. The gas barrier film of claim 4 , wherein the polyester resin film base material consists of the mixture of polybutylene terephthalate and polyethylene terephthalate.

6. The gas barrier film of claim 5 , wherein the heat shrinkage rate in the machine direction (MD direction) of the gas barrier film is from 0.9% to 2.3%.

7. The gas barrier film of claim 1 , wherein the anchor layer consists of acrylic urethane resin or polyester polyurethane resin.

8. The gas barrier film of claim 1 , wherein the metal alkoxide is tetraethoxysilane and triisopropoxy aluminum.

9. A gas barrier film, comprising:
a single layer polyester resin film base material consisting of polybutylene terephthalate or a mixture of polybutylene terephthalate and polyethylene terephthalate with a content of the polybutylene terephthalate in the mixture being 60% mass or more, the polyester resin film base material has a first surface and a second surface, which is opposite to the first surface;
an anchor layer directly on the first surface of the single layer polyester resin film base material; and
an AlO x layer or a SiO x layer having a thickness of no less than 5 nm and no greater than 100 nm directly on the anchor layer; and
a gas barrier protective layer on the AlO x layer or the SiO x layer; the gas barrier protective layer comprises a hydrolysate of a metal alkoxide and polyvinyl alcohol,
wherein the gas barrier film has a tensile elasticity modulus within a range of 2.0 to 4.0 GPa, and a heat shrinkage rate in the machine direction (MD direction) after heating for 30 minutes at 150° C. of 0.6% or more but less than 3.0%, the heat shrinkage rate being represented by the following formula:
Heat shrinkage rate={(Length before heating−Length after heating)/Length before heating}×100(%).

10. The gas barrier film of claim 9 , wherein the metal alkoxide is tetraethoxysilane.

11. The gas barrier film of claim 9 , wherein the anchor layer consists of acrylic urethane resin or polyester polyurethane resin.

12. The gas barrier film of claim 9 , wherein the metal alkoxide is tetraethoxysilane and triisopropoxy aluminum.

Assignees

• Toppan Printing Co Ltd

Inventors

• Ishii Ryoji
• Nishikawa Takeshi
• Hongo Tadashi

Classifications

• C08J7/0423 Primary

  with at least one layer of inorganic material and at least one layer of a composition containing a polymer binder · CPC title

• B05D7/04

  to surfaces of films or sheets (producing layered products by applying coatings of pasty or pulverulent plastics B29C41/00) · CPC title

• B32B2307/50

  having particular mechanical properties · CPC title

• B32B27/36

  comprising polyesters · CPC title

• B32B2307/734

  Dimensional stability · CPC title