Polyester film

Patent metadata

Field	Value
Publication number	US-9375902-B2
Application number	US-200913121597-A
Country	US
Kind code	B2
Filing date	Sep 25, 2009
Priority date	Sep 30, 2008
Publication date	Jun 28, 2016
Grant date	Jun 28, 2016

Abstract

A polyester film includes ethylene glycol component that accounts for 60 mol % or more of the glycol components in the polyester film, containing a crystal nucleating agent up to 0.01 to 5 mass % relative to the entire polyester film that accounts for 100 mass %, and having a crystal melting energy, ΔHm, of 5 to 35 J/g.

First claim

The invention claimed is:

1. A biaxially oriented polyester film comprising an ethylene glycol component that accounts for 62.2 mol % or more of glycol components in the polyester film, containing a crystal nucleating agent up to 0.01 to 5 mass % relative to the entire polyester film that accounts for 100 mass %, and having a crystal melting energy, ΔHm, of 5 to 35 J/g, a plane orientation coefficient of 0.07 to 0.13, a breaking elongation in a length direction and in a width direction of 420% to 700%, and an F100 value in length and width directions at 150° C. of 3 to 30 MPa.

2. The biaxially oriented polyester film as claimed in Claim 1 , wherein said crystal nucleating agent is at least one selected from the group consisting of an aliphatic carboxylic acid amide, an aliphatic carboxylate, and a sorbitol compound.

3. The biaxially oriented polyester film as claimed in Claim 1 , having a plane orientation coefficient of 0.07 to 0.11.

4. The biaxially oriented polyester film as claimed in Claim 1 , having a melting point of 230 to 255 degrees C.

5. A product formed from the biaxially oriented polyester film as claimed in Claim 1 .

6. The biaxially oriented polyester film as claimed in Claim 1 , comprising a polyester layer (Layer b), wherein the ethylene glycol component accounts for 60 mol % or more of the glycol components that constitute said polyester layer (Layer b), said crystal nucleating agent accounting for 0.01 to 5 mass % relative to said polyester layer that accounts for 100 mass %, said crystal melting energy, ΔHm, being in the range of 5 to 35 J/g, and the ratio of the layer thickness of said polyester layer (Layer b), TB(μm), to film thickness of said polyester film, TF(μm), being 0.6 or more.

7. The biaxially oriented polyester film as claimed in Claim 6 , wherein a 1,4-cyclohexanedimethanol component accounts for 1 to 30 mol % of the glycol components that constitute the polyester layer (Layer b).

8. The biaxially oriented polyester film as claimed in claim 6 , wherein a 1,4-butanediol and/or 1,3-propanediol components account for 1 to 30 mol % of the glycol components that constitute the polyester layer (Layer b).

9. The biaxially oriented polyester film as claimed in Claim 6 , wherein said crystal nucleating agent is at least one selected from the group consisting of an aliphatic carboxylic acid amide, an aliphatic carboxylate, and a sorbitol compound.

Assignees

• Manabe Isao
• Tanaka Teruya
• Kimura Masahiro
• Toray Industries

Inventors

• Manabe Isao
• Tanaka Teruya
• Kimura Masahiro

Classifications

• C08J5/18

  Manufacture of films or sheets · CPC title

• B32B27/36

  comprising polyesters · CPC title

• C08K5/20

  Carboxylic acid amides · CPC title

• C08K5/098

  Metal salts of carboxylic acids · CPC title

• C08L67/02

  Polyesters derived from dicarboxylic acids and dihydroxy compounds (C08L67/06 takes precedence) · CPC title