POLYESTER SINGLE LAYER FILM

• US 20190322798A1
• Filed: 06/14/2017
• Published: 10/24/2019
• Est. Priority Date: 06/17/2016
• Status: Active Grant

• Current Assignee: SK Microworks Company Limited
• Original Assignee: SKC Company Limited
• Inventors: KWAK, Ki-Yuel, LEE, Jung Kyu, LEE, Seungwon, YU, Hojin
• Granted Patent: US 11,084,900 B2
• Time in Patent Office: Days
• CPC Class Codes: C08G 63/183 Terephthalic acids
• CPC Class Codes: C08G 63/863 Germanium or compounds thereof
• CPC Class Codes: C08J 2367/02 Polyesters derived from dicarboxylic acids and dihydroxy compounds; C08J2367/06 takes precedence
• CPC Class Codes: C08J 5/18 Manufacture of films or sheets
• CPC Class Codes: C08J 7/043 Improving the adhesiveness of the coatings per se, e.g. forming primers adhesives in the form of films or foils characterised by the primer layers between the polymer carriers and the adhesives C09J7/50
• CPC Class Codes: C08J 7/044 Forming conductive coatings; Forming coatings having anti-static properties
• CPC Class Codes: C08J 7/06 with compositions not containing macromolecular substances
• CPC Class Codes: C08K 3/08 Metals
• CPC Class Codes: C08L 67/00 Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain of polyester-amides C08L77/12; of polyester-imides C08L79/08; Compositions of derivatives of such polymers
• CPC Class Codes: G02B 1/04 made of organic materials, e.g. plastics G02B1/08 takes precedence
• CPC Class Codes: H01B 3/421 Polyesters
• CPC Class Codes: H01B 5/14 comprising conductive layers or films on insulating-supports

Abstract

A polyester single layer film according to an embodiment of the present invention has low haze and low oligomer characteristics, has a more bluish color coordinate, and has a low inorganic metal content. Accordingly, the polyester single layer film may be used as a base film of a heat-resistant protective film and a light-scattering preventive film, as well as an ITO and non-ITO base film (for Ag nanowire, or the like) used in recent touch panels. In addition, since the transmittance at a wavelength of 550 nm is relatively high due to less impurity, the polyester single layer film may be used as a base film of a prism for a backlight unit (BLU) and a diffusion sheet.

Claims

1. A polyester single layer film comprising a polyester resin prepared by using a germanium compound as a catalyst, wherein the polyester single layer film has a haze of 0.5% or less and shows a haze change rate of 1% or less when heat-treated at 150°

C. for 3 hours.

2. The polyester single layer film of claim 1, wherein the polyester single layer film comprises an inorganic metal of 100 ppm or less, and the inorganic metal does not comprise silicon.

3. The polyester single layer film of claim 1, wherein the polyester single layer film shows a haze change rate of 2% or less when heat-treated at 150°

C. for 9 hours.

4. The polyester single layer film of claim 1, wherein the polyester single layer film comprises an inorganic metal of 100 ppm or less, and does not comprise an applicator component selected from the group consisting of magnesium and potassium.

5. The polyester single layer film of claim 1, wherein the polyester resin is polyethylene terephthalate.

6. The polyester single layer film of claim 1, wherein the polyester resin has an intrinsic viscosity (IV) of 0.6 to 0.8 dl/gr.

7. The polyester single layer film of claim 1, wherein the polyester single layer film comprises a total oligomer in an amount of 0.5 to 2.2% by weight when measured by being dissolved in trifluoroacetic acid.

8. A conductive film, comprising:

the polyester single layer film according to claim 1; and

an indium tin oxide (ITO)-based conductive layer, which is formed on one side of the polyester single layer film, in a laminated form,

wherein the conducive layer does not comprise a hard coating layer.

9. A heat-resistant protective film comprising the polyester single layer film according to claim 1.

10. A light-scattering preventive film comprising the polyester single layer film according to claim 1.

11. An optical sheet comprising the polyester single layer film according to claim 1.