Optical film having excellent impact resistance and display device comprising same

Patent metadata

Field	Value
Publication number	US-2023097067-A1
Application number	US-202117760313-A
Country	US
Kind code	A1
Filing date	Mar 26, 2021
Priority date	Mar 26, 2020
Publication date	Mar 30, 2023
Grant date	—

Abstract

The present disclosure provides an optical film comprising: a light-transmitting substrate; and a buffer layer, wherein a first impact resistance parameter calculated by equation 1 is 0.08 or higher, and a display device comprising the optical film.

First claim

1 . An optical film comprising:
a light-transmitting substrate; and a buffer layer, the optical film having a first impact resistance parameter calculated by the following Equation 1, of 0.08 or more:
First impact resistance parameter=[{(thickness of light-transmitting substrate×1.5)+(restoration rate of light-transmitting substrate×0.01×1.5)+(thickness of buffer layer×2)+(restoration rate of buffer layer×0.01×1.5)}×(restoration rate of optical film×0.01×2)×puncture strength of optical film]/(thickness of optical film)  [Equation 1]

wherein the restoration rate (nIT; 12 mN) of the light-transmitting substrate, the buffer layer and the optical film are measured under the conditions of 12 mN/12 s/Creep 5 s/24° C., 40 RH % using HM2000 produced by Fischer Corporation, and the puncture strength is measured in accordance with the ASTM D4830 standard.

2 . The optical film according to claim 1 , wherein the buffer layer comprises a urethane acrylate resin.

3 . The optical film according to claim 1 , wherein the buffer layer comprises a urethane acrylate siloxane resin.

4 . The optical film according to claim 3 , wherein the urethane acrylate siloxane resin comprises:
a urethane acrylate silane compound represented by the following Formula 1; an alkoxysilane compound represented by the following Formula 2; and a diol compound represented by the following Formula 3:

wherein R 1 is a functional group derived from a C1-C8 aliphatic or aromatic hydrocarbon, R 2 and R 3 are each independently a C1-C6 linear, branched, or alicyclic alkylene group, R 4 is an acrylate group or methacrylate group, and n is an integer of 1 to 3,
R 5 m Si(OR 6 ) 4-m   [Formula 2]

wherein R 5 and R 6 are each independently a functional group derived from a C1-C8 aliphatic or aromatic hydrocarbon, and m is an integer of 0 to 3,
HO—R 7 —OH  [Formula 3]

wherein R 7 is a functional group derived from a C1-C6 aliphatic or aromatic hydrocarbon.

5 . The optical film according to claim 4 , wherein R 4 is an acrylate group including a hydroxyl group (—OH).

6 . The optical film according to claim 4 , wherein R 4 is an acrylate group derived from one of 2-hydroxyethyl acrylate (2-HEA) and 4-hydroxybutyl acrylate (4-HBA).

7 . The optical film according to claim 4 , wherein the alkoxysilane compound comprises tetraalkoxysilane.

8 . The optical film according to claim 4 , wherein the diol compound comprises ethylene glycol.

9 . The optical film according to claim 1 , wherein the buffer layer has a thickness of 10 to 150 μm.

10 . The optical film according to claim 1 , wherein the light-transmitting substrate has a thickness of 10 to 100 μm.

11 . The optical film according to claim 1 , wherein the optical film has a restoration rate (nIT) of 60 to 100% based on 12 mN.

12 . The optical film according to claim 1 , further comprising a hard coating layer,
wherein the optical film has a second impact resistance parameter calculated by the following Equation 2, of 0.08 or more:
Second impact resistance parameter=[{(thickness of light-transmitting substrate×1.5)+(restoration rate of light-transmitting substrate×1.5×0.01)+(thickness of buffer layer×2)+(restoration rate of buffer layer×1.5×0.01)}+(thickness of hard coating layer×1)+(restoration rate of hard coating layer×0.01×1)}×(restoration rate of optical film×0.01×2)×puncture strength of optical film]/(thickness of optical film) 2   [Equation 2]

wherein the restoration rates (nIT; 12 mN) of the light-transmitting substrate, the buffer layer, the hard coating layer and the optical film are measured under the conditions of 12 mN/12 s/Creep 5 s/24° C., 40 RH % using HM2000 produced by Fischer Corporation, and the puncture strength is measured in accordance with the ASTM D4830 standard.

13 . The optical film according to claim 12 , wherein the hard coating layer has a thickness of 0.1 to 10 μm.

14 . A display device comprising:
a display panel; and the optical film according to claim 1 , disposed on the display panel.

Assignees

• Kolon Inc

Inventors

• Jung Hak-Gee
• Ahn Sang-Hyun
• Shin Hyora

Classifications

• C08J2379/08

  Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors · CPC title

• G02B1/04

  made of organic materials, e.g. plastics (G02B1/08 takes precedence) · CPC title

• C08J2483/04

  Polysiloxanes · CPC title

• C08J7/042 Primary

  with two or more layers, where at least one layer of a composition contains a polymer binder · CPC title

• C08J7/0427

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