Hard coating film and flexible display having the same

Patent metadata

Field	Value
Publication number	US-2017335136-A1
Application number	US-201715597236-A
Country	US
Kind code	A1
Filing date	May 17, 2017
Priority date	May 19, 2016
Publication date	Nov 23, 2017
Grant date	—

Abstract

The present invention provides a hard coating film comprising: a substrate; a first hard coating layer formed on one surface of the substrate; and a second hard coating layer formed on the other surface of the substrate, wherein the first hard coating layer includes a cross-linked polymer of an oligomer having an elongation of 50 to 350%, the second hard coating layer includes a cross-linked polymer of an oligomer having an elongation of 0.1 to 50%, and the crosslinking density of the first hard coating layer is smaller than the crosslinking density of the second hard coating layer, and a flexible display having the hard coating film. The hard coating film according to the present invention has excellent impact resistance and curling properties and also has excellent bending resistance.

First claim

1 . A hard coating film, comprising:
a substrate; a first hard coating layer formed on one surface of the substrate; and a second hard coating layer formed on the other surface of the substrate, wherein the first hard coating layer includes a cross-linked polymer of an oligomer having an elongation of 50 to 350%, the second hard coating layer includes a cross-linked polymer of an oligomer having an elongation of 0.1 to 50%, and the crosslinking density of the first hard coating layer is smaller than the crosslinking density of the second hard coating layer.

2 . The hard coating film of claim 1 , wherein the first hard coating layer is formed from a first hard coating composition comprising an oligomer having an elongation of 50 to 350%, a photoinitiator and a solvent.

3 . The hard coating film of claim 2 , wherein the oligomer having an elongation of 50 to 350% includes a urethane acrylate oligomer.

4 . The hard coating film of claim 3 , wherein the urethane acrylate oligomer includes a bifunctional urethane acrylate oligomer.

5 . The hard coating film of claim 1 , wherein the second hard coating layer is formed from a second hard coating composition comprising an oligomer having an elongation of 0.1 to 50%, a photoinitiator, inorganic nanoparticles, and a solvent.

6 . The hard coating film of claim 5 , wherein the oligomer having an elongation of 0.1 to 50% includes a polyfunctional urethane acrylate oligomer.

7 . The hard coating film of claim 6 , wherein the polyfunctional urethane acrylate oligomer includes a trifunctional urethane acrylate oligomer.

8 . A flexible display having the hard coating film of claim 1 .

9 . A window of a flexible display having the hard coating film of claim 1 .

10 . A polarizing plate having the hard coating film of claim 1 .

11 . A touch sensor having the hard coating film of claim 1 .

Assignees

• Dongwoo Fine Chem Co Ltd

Inventors

• Lee Seungwoo

Classifications

• C08F299/065

  from polyurethanes with side or terminal unsaturations · CPC title

• G02F1/133528

  Polarisers · CPC title

• G02B1/14 Primary

  Protective coatings, e.g. hard coatings · CPC title

• C09D4/00

  Coating compositions, e.g. paints, varnishes or lacquers, based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond {; Coating compositions, based on monomers of macromolecular compounds of groups C09D183/00 - C09D183/16} · CPC title

• C08G18/672

  Esters of acrylic or alkyl acrylic acid having only one group containing active hydrogen · CPC title