Protective film, display device including the protective film, and method of manufacturing the protective film

Patent metadata

Field	Value
Publication number	US-2024172381-A1
Application number	US-202318515127-A
Country	US
Kind code	A1
Filing date	Nov 20, 2023
Priority date	Nov 21, 2022
Publication date	May 23, 2024
Grant date	—

Abstract

A protective film, a display device including the protective film and a method of manufacturing the protective film are provided. The protective film includes a urethane adhesive layer including a urethane adhesive resin, a base film layer on the urethane adhesive layer, and a hard coating layer on the base film layer and including a fluorine-based photocurable resin and a glycol-based photocurable resin.

First claim

What is claimed is:

1 . A protective film comprising:
a urethane adhesive layer comprising a urethane adhesive resin; a base film layer on the urethane adhesive layer; and a hard coating layer on the base film layer and comprising a fluorine-based photocurable resin and a glycol-based photocurable resin.

2 . The protective film of claim 1 , wherein the hard coating layer comprises a urethane photocurable resin and a propane-based photocurable resin.

3 . The protective film of claim 2 , wherein, based on a total weight of the hard coating layer,
a weight ratio of the fluorine-based photocurable resin is in a range of about 3 wt % to about 10 wt %, a weight ratio of the glycol-based photocurable resin is in a range of about 1 wt % to about 8 wt %, a weight ratio of the urethane photocurable resin is in a range of about 10 wt % to about 50 wt %, and a weight ratio of the propane-based photocurable resin is in a range of about 1 wt % to about 15 wt %.

4 . The protective film of claim 1 , wherein a thickness of the base film layer is in a range of about 15 μm to about 100 μm.

5 . The protective film of claim 1 , wherein a thickness of the hard coating layer is less than a thickness of the base film layer.

6 . The protective film of claim 5 , wherein the thickness of the hard coating layer is in a range of about 1 μm to about 10 μm.

7 . The protective film of claim 1 , further comprising a lower exfoliation layer below the urethane adhesive layer.

8 . The protective film of claim 7 , wherein the lower exfoliation layer comprises a synthetic resin material film layer and a release coating layer on the synthetic resin material film layer.

9 . The protective film of claim 1 , further comprising an upper exfoliation layer on the hard coating layer.

10 . The protective film of claim 1 , wherein the urethane adhesive resin comprises a polyol having a molecular weight in a range of about 400 to about 1000.

11 . The protective film of claim 1 , wherein the urethane adhesive resin comprises a polyol having four functional groups.

12 . A display device comprising:
a display panel; a cover window on the display panel; and a protective film on the cover window, wherein the protective film comprises:
a urethane adhesive layer comprising a urethane adhesive resin;
a base film layer on the urethane adhesive layer; and
a hard coating layer on the base film layer and comprising a fluorine-based photocurable resin and a glycol-based photocurable resin.

13 . The display device of claim 12 , wherein the display panel comprises a flat area and a curved area bent outside the flat area.

14 . The display device of claim 12 , wherein the hard coating layer comprises a urethane photocurable resin and a propane-based photocurable resin.

15 . The display device of claim 14 , wherein, based on a total weight of the hard coating layer,
a weight ratio of the fluorine-based photocurable resin is in a range of about 3 wt % to about 10 wt %, a weight ratio of the glycol-based photocurable resin is in a range of about 1 wt % to about 8 wt %, a weight ratio of the urethane photocurable resin is in a range of about 10 wt % to about 50 wt %, and a weight ratio of the propane-based photocurable resin is in a range of about 1 wt % to about 15 wt %.

16 . The display device of claim 12 , wherein a thickness of the base film layer is in a range of about 15 μm to about 100 μm.

17 . The display device of claim 12 , wherein a thickness of the hard coating layer is less than a thickness of the base film layer.

18 . The display device of claim 12 , wherein the urethane adhesive resin comprises a polyol having a molecular weight in a range of about 400 to about 1000.

19 . The display device of claim 12 , wherein the urethane adhesive resin comprises a polyol having four functional groups.

20 . A method of manufacturing a protective film, the method comprising:
applying a base film layer; forming a hard coating layer on the base film layer, the hard coating layer comprising a fluorine-based photocurable resin and a glycol-based photocurable resin; and forming a urethane adhesive layer below the base film layer.

21 . The method of claim 20 , wherein the forming of the hard coating layer comprises:
manufacturing a hard coating composition comprising the fluorine-based photocurable resin, the glycol-based photocurable resin, a urethane photocurable resin, a propane-based photocurable resin, a solvent, and a photoinitiator; coating the hard coating composition on the base film layer; and ultraviolet (UV)-photocuring the coated hard coating composition.

22 . The method of claim 21 , wherein, based on a total weight of the hard coating composition,
a weight ratio of the fluorine-based photocurable resin is in a range of about 3 wt % to about 10 wt %, a weight ratio of the glycol-based photocurable resin is in a range of about 1 wt % to about 8 wt %, a weight ratio of the urethane photocurable resin is in a range of about 10 wt % to about 50 wt %, a weight ratio of the propane-based photocurable resin is in a range of about 1 wt % to about 15 wt %, a weight ratio of the solvent is in a range of about 30 wt % to about 80 wt %, and a weight ratio of the photoinitiator is in a range of about 0.5 wt % to about 10 wt %.

23 . The method of claim 21 , wherein the hard coating composition is coated on the base film layer by a micro gravure coating operation.

24 . The method of claim 20 , wherein the forming of the urethane adhesive layer comprises:
manufacturing a urethane adhesive composition comprising a urethane adhesive resin and a urethane adhesive curing agent; coating the urethane adhesive composition on a lower portion of the base film layer; and thermally curing the coated urethane adhesive composition.

25 . The method of claim 24 , wherein the urethane adhesive composition is coated on the lower portion of the base film layer by a slot die coating operation.

26 . The method of claim 24 , wherein the urethane adhesive resin comprises polypropylene glycol, hexamethylene diisocyanate (HDI), a catalyst, and a solvent, and
the urethane adhesive curing agent comprises at least one of CORNATE HX, DESMODUR Z 4470, KONNATE L-75, or DURANATE 24A-100.

27 . The method of claim 20 , further comprising:
forming a lower exfoliation layer below the urethane adhesive layer; and forming an upper exfoliation layer on the hard coating layer.

28 . The method of claim 27 , wherein the forming of the lower exfoliation layer comprises:
applying a synthetic resin material film layer; and forming a release coating layer by coating a silicone release agent on the synthetic resin material film layer with a slot die coater.

Assignees

• Samsung Display Co Ltd
• Inno F C Co Ltd

Inventors

• Kim Sung
• Na Hyungdon
• Lee Seungkyu
• Jeon Kapje
• Ro Bumsuk
• Park Yongseok
• Oh Donghyeok
• Jung Jaeduck
• Cho Kyoungseok

Classifications

• C09J2475/00

  Presence of polyurethane · CPC title

• C09J2475/006

  in the substrate · CPC title

• C09J2423/106

  in the substrate · CPC title

• C09J2467/006

  in the substrate · CPC title

• C08J2375/04

  Polyurethanes · CPC title