Thin protective display film

Patent metadata

Field	Value
Publication number	US-10005264-B2
Application number	US-201514968993-A
Country	US
Kind code	B2
Filing date	Dec 15, 2015
Priority date	Dec 15, 2015
Publication date	Jun 26, 2018
Grant date	Jun 26, 2018

Abstract

A display film includes a transparent polymeric substrate layer having a 0.2% offset yield stress greater than 110 MPa and a transparent aliphatic cross-linked polyurethane layer having a thickness of 100 micrometers or less disposed on the transparent polymeric substrate layer. The transparent aliphatic cross-linked polyurethane layer has a glass transition temperature in a range from 11 to 27 degrees Celsius and a Tan Delta peak value in a range from 0.5 to 2.5. The display film has a haze value of 2% or less.

First claim

What is claimed is:

1. A display film comprising:
a transparent polymeric substrate layer having an 0.2% offset yield stress greater than 110 MPa; and
a transparent aliphatic cross-linked polyurethane layer having a thickness of 10 to 100 micrometers disposed on the transparent polymeric substrate layer, the transparent aliphatic cross-linked polyurethane layer having a glass transition temperature in a range from 11 to 27 degrees Celsius and a Tan Delta peak value in a range from 0.5 to 2.5;
the display film having a haze value of 2% or less.

2. The display film according to claim 1 , wherein the transparent aliphatic cross-linked polyurethane layer has a cross-link density in a range from 0.34 to 0.65 mol/kg.

3. The display film according to claim 1 , wherein the transparent aliphatic cross-linked polyurethane layer has a Tan Delta peak value in a range from 1 to 2.

4. The display film according to claim 1 , wherein the display film has a thickness of less than 200 micrometers and the transparent polymeric substrate layer has a 0.2% offset yield stress greater than 130 MPa.

5. The display film according to claim 1 , wherein the transparent aliphatic cross-linked polyurethane layer has a glass transition temperature in a range from 17 to 22 degrees Celsius and a Tan Delta peak value in a range from 1.4 to 1.8.

6. The display film according to claim 1 , wherein the display film has a haze of 1% or less.

7. The display film according to claim 1 , wherein the display film has a visible light transmission of 85% or greater.

8. The display film according to claim 1 , further comprising a removable liner disposed on the transparent polymeric substrate layer or the transparent aliphatic cross-linked polyurethane layer.

9. The display film according to claim 1 , further comprising an optical adhesive layer disposed on the transparent polymeric substrate layer and a removable liner disposed on the optical adhesive layer and a second removable liner disposed on the transparent aliphatic cross-linked polyurethane layer.

10. The display film according to claim 1 , wherein the transparent polymeric substrate comprises polyimide.

11. A display film comprising:
a transparent polymeric substrate layer having an 0.2% offset yield stress greater than 110 MPa; and
a transparent aliphatic cross-linked polyurethane layer having a thickness of 10 to 100 micrometers disposed on the transparent polymeric substrate layer, the transparent aliphatic cross-linked polyurethane layer having a glass transition temperature in a range from 11 to 28 degrees Celsius and a Tan Delta peak value in a range from 0.5 to 2.5;
the display film remains intact after at least 100,000 bending cycles about a 3 mm radius.

12. The display film according to claim 11 , wherein the transparent aliphatic cross-linked polyurethane layer has a cross-link density in a range from 0.34 to 0.65 mol/kg.

13. The display film according to claim 11 , wherein the transparent aliphatic cross-linked polyurethane layer has a Tan Delta peak value in a range from 1 to 2.

14. The display film according to claim 11 , wherein the display film has a thickness of less than 200 micrometers and the transparent polymeric substrate layer has a 0.2% offset yield stress greater than 130 MPa.

15. The display film according to claim 11 , wherein the transparent aliphatic cross-linked polyurethane layer has a glass transition temperature in a range from 17 to 22 degrees Celsius and a Tan Delta peak value in a range from 1.4 to 1.8.

16. The display film according to claim 11 , wherein the display film has a haze of 1% or less and a visible light transmission of 85% or greater.

17. The display film according to claim 11 , wherein the transparent polymeric substrate comprises polyimide.

18. An article, comprising:
an optical display;
a protective film disposed on the optical display, the protective film comprising:
a transparent polymeric substrate layer having a 0.2% offset yield stress greater than 110 MPa;
a transparent aliphatic cross-linked polyurethane layer having a thickness of 10 to 100 micrometers disposed on the transparent polymeric substrate layer, the transparent aliphatic cross-linked polyurethane layer having a glass transition temperature in a range from 11 to 28 degrees Celsius and a Tan Delta peak value in a range from 0.5 to 2.5 and a cross-link density in a range from 0.34 to 0.65 mol/kg;
the display film having a haze value of 2% or less;

an optical adhesive layer fixing the transparent polymeric substrate layer to the optical display.

19. The article according to claim 18 , wherein the optical display comprises an OLED display panel.

20. The article according to claim 18 , wherein the optical display and protective film are foldable so that the optical display faces itself and at least a portion of protective film overlaps another portion of the protective film.

Assignees

• 3M Innovative Properties Co

Inventors

• Leatherdale Catherine A
• Thompson David Scott
• Johnson Michael A
• Stradinger John J
• Breedlove Evan L
• Solomonson Steven D
• Rule Joseph D

Classifications

• B32B2307/7244

  Oxygen barrier · CPC title

• B32B2307/546

  Flexural strength; Flexion stiffness · CPC title

• B32B2457/206

  Organic displays, e.g. OLED · CPC title

• B32B2255/10

  on synthetic resin layer or on natural or synthetic rubber layer · CPC title

• B32B2307/536

  Hardness · CPC title