Layered polyester film

Patent metadata

Field	Value
Publication number	US-11325362-B2
Application number	US-201616066232-A
Country	US
Kind code	B2
Filing date	Dec 26, 2016
Priority date	Dec 28, 2015
Publication date	May 10, 2022
Grant date	May 10, 2022

Abstract

To provide a layered polyester film having excellent mechanical properties, transparency, heat resistance, and gas barrier property. A layered polyester film including a polyester film and a thin film layer, wherein the polyester film is a biaxially oriented polyester film including a dicarboxylic acid component containing mainly a furandicarboxylic acid and a glycol component containing mainly ethylene glycol, the covering layer is formed on at least one surface of the polyester film, and the layered polyester film has a plane orientation coefficient ΔP of not less than 0.100 and not more than 0.200, and a thickness of the layered polyester film is not thinner than 1 μm and not thicker than 300 μm.

First claim

The invention claimed is:

1. A layered polyester film comprising a polyester film and a covering layer, wherein
the polyester film is a biaxially oriented polyester film including a dicarboxylic acid component containing mainly a furandicarboxylic acid and a glycol component containing mainly ethylene glycol,
the covering layer is formed on at least one surface of the polyester film, and
the layered polyester film has a plane orientation coefficient ΔP of not less than 0.100 and not more than 0.200, and a thickness of the layered polyester film is not thinner than 1 μm and not thicker than 300 μm.

2. The layered polyester film according to claim 1 , wherein the layered polyester film has an oxygen permeability of not less than 0.1 mL/m 2 /day/MPa and not more than 1000 mL/m 2 /day/MPa under a temperature of 23° C. and a humidity of 65%.

3. The layered polyester film according to claim 2 , wherein the covering layer contains at least one kind resin selected from a polyester-based resin, a urethane-based resin, and an acrylic-based resin.

4. The layered polyester film according to claim 2 , wherein the covering layer further contains inorganic particles.

5. The layered polyester film according to claim 2 , wherein the layered polyester film has a coefficient of static friction (μs) of not more than 1.0 and a coefficient of dynamic friction (μd) of not more than 1.0.

6. The layered polyester film according to claim 2 , wherein the layered polyester film has a heat shrinkage rate of not less than 0.01% and not more than 30% when heated at 150° C. for 30 minutes.

7. The layered polyester film according to claim 1 , wherein the covering layer contains at least one kind resin selected from a polyester-based resin, a urethane-based resin, and an acrylic-based resin.

8. The layered polyester film according to claim 1 , wherein the covering layer further contains inorganic particles.

9. The layered polyester film according to claim 1 , wherein the layered polyester film has a coefficient of static friction (μs) of not more than 1.0 and a coefficient of dynamic friction (μd) of not more than 1.0.

10. The layered polyester film according to claim 1 , wherein the layered polyester film has a heat shrinkage rate of not less than 0.01% and not more than 30% when heated at 150° C. for 30 minutes.

11. The layered polyester film according to claim 1 , wherein the layered polyester film has a heat shrinkage rate of not less than 0.01% and not more than 20% when heated at 150° C. for 30 minutes.

12. The layered polyester film according to claim 1 , wherein the layered polyester film has a heat shrinkage rate of not less than 0.01% and not more than 10% when heated at 150° C. for 30 minutes.

13. A polyester film roll obtained by winding the layered polyester film according to claim 1 .

Assignees

• Toyo Boseki
• Furanix Technologies Bv

Inventors

• Inagaki Jun
• Sawada Kaoru
• Numata Yukihiro
• Van Berkel Jesper Gabriel

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

• B32B2255/10

  on synthetic resin layer or on natural or synthetic rubber layer · CPC title

• C08G63/672

  Dicarboxylic acids and dihydroxy compounds · CPC title

• C08J7/046

  Forming abrasion-resistant coatings; Forming surface-hardening coatings · CPC title

• C08J7/0427

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