IP Library › Granted Patent US 10,962,688
Granted Patent B2
US 10,962,688 · App. 16/311,863 · Granted Mar 30, 2021

Low Tg polyurethane protective display film

Inventors: David S. Thompson (Bayport, MN); Ryan M. Braun (St. Paul, MN); Joseph D. Rule (Woodbury, MN); Catherine A. Leatherdale (Woodbury, MN); Steven D. Solomonson (Shoreview, MN); Peter D. Condo (Lake Elmo, MN); John J. Stradinger (Roseville, MN); Michael A. Johnson (Stillwater, MN); Richard J. Pokorny (Maplewood, MN); Derek W. Patzman (Savage, MN); Peihui Zhang (Woodbury, MN); Evan L. Breedlove (Woodbury, MN)
Assignee: 3M INNOVATIVE PROPERTIES COMPANY
G02B1/14B32B27/16C08J7/042
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Quick Facts
Patent No.
US 10,962,688
App. No.
16/311,863
Granted
Mar 30, 2021
Kind
B2
Abstract

A display film includes a transparent cross-linked polyurethane layer. The transparent cross-linked polyurethane layer having a glass transition temperature of 10 degrees Celsius or less and a Tan Delta peak value of 0.5 or greater.

Claims (45)

1. A display film comprising:

a transparent polymeric substrate layer; and

a transparent cross-linked polyurethane layer disposed on the transparent polymeric substrate layer, the transparent cross-linked polyurethane layer having a glass transition temperature of 10 degrees Celsius or less and a Tan Delta peak value of 0.5 or greater.

2. The display film according to claim 1 , further comprising a hardcoat layer disposed on the transparent polymeric substrate layer, and the transparent polymeric substrate layer separates the transparent cross-linked polyurethane layer from the hardcoat layer.

3. The display film according to claim 1 , further comprising an adhesive layer disposed on the transparent cross-linked polyurethane layer, and the transparent cross-linked polyurethane layer separates the transparent polymeric substrate layer from the adhesive layer.

4. The display film according to claim 3 , further comprising a release or removable liner disposed on the adhesive layer.

5. The display film according to claim 1 , further comprising a second transparent polymeric substrate layer disposed on the transparent cross-linked polyurethane layer, and the transparent cross-linked polyurethane layer separates the transparent polymeric substrate layer from the second transparent polymeric substrate layer.

6. The display film according to claim 5 , further comprising an adhesive layer disposed on the second transparent polymeric substrate layer, and the second transparent polymeric substrate layer separates the transparent cross-linked polyurethane layer from the adhesive layer.

7. The display film according to claim 6 , further comprising a release or removable liner disposed on the adhesive layer.

8. The display film according to claim 1 , wherein the transparent cross-linked polyurethane layer has a glass transition temperature of 5 degrees Celsius or less, or 0 degrees Celsius or less, or −5 degrees Celsius or less, or in a range from −40 to 5 degrees Celsius, or in a range from −30 to 5 degrees Celsius, or in a range from −20 to 5 degrees Celsius, or in a range from −15 to 5 degrees Celsius, or in a range from −10 to 5 degrees Celsius, or in a range from −5 to 5 degrees Celsius.

9. The display film according to claim 1 , wherein the transparent cross-linked polyurethane layer has a Tan Delta peak value of 0.5 or greater, or 0.8 or greater, or 1.0 or greater, or 1.2 or greater, or in a range from 0.5 to 2.5, or in a range from 1 to 2.5, and the transparent cross-linked polyurethane layer has a cross-link density in a range from 0.1 to 1.0 mol/kg or from 0.2 to 0.9 mol/kg or from 0.37 to 0.74 mol/kg.

10. The display film according to claim 1 , wherein the display film has a haze of 2.0% or less or 1.5% or less or 1.0% or less or 0.5% or less and a visible light transmission of 85% or greater, or 90% or greater.

11. The display film according to claim 1 , wherein the transparent cross-linked polyurethane layer has a thickness in a range from 75 to 200 micrometers, or 100 to 200 micrometers, or from 150 to 200 micrometers.

12. The display film according to claim 6 , wherein the hardcoat layer comprises nanoparticles and has a thickness in a range from 2 to 30 micrometers, or from 2 to 15 micrometers, or from 3 to 10 micrometers.

13. The display film according to claim 1 , wherein the transparent polymeric substrate layer or the second transparent polymeric substrate layer, has a thickness in a range from 10 to 125 micrometers, or from 25 to 100 micrometers, or from 30 to 85 micrometers, and a yield stress value greater than 90 MPa, or greater than 100 MPa, or greater than 120 MPa, or greater than 160 MPa.

14. The display film according to claim 1 , wherein the display film has a thickness in a range from 85 to 350 micrometers or from 100 to 300 micrometers or from 150 to 250 micrometers.

15. A display film comprising:

a transparent cross-linked polyurethane layer, the transparent cross-linked polyurethane layer having a glass transition temperature of 10 degrees Celsius or less and a Tan Delta peak value of 0.5 or greater; and

a transparent protective layer disposed on the transparent cross-linked polyurethane layer.

16. The display film according to claim 15 , wherein the protective layer is a hardcoat layer comprising nanoparticles and having a thickness in a range from 2 to 30 micrometers, or from 2 to 15 micrometers, or from 3 to 10 micrometers.

17. The display film according to claim 15 , wherein the protective layer is an abrasion resistant layer having a thickness in a range from 2 to 100 micrometers, or from 10 to 100 micrometers, or from 10 to 50 micrometers.

18. The display film according to claim 15 , wherein the protective layer is an elastic nano-composite layer having a thickness in a range from 30 to 125 micrometers.

19. The display film according to claim 15 , further comprising an adhesive layer disposed on the transparent cross-linked polyurethane layer, and the transparent cross-linked polyurethane layer separates the protective layer from the adhesive layer.

20. The display film according to claim 19 , further comprising a release or removable liner disposed on the adhesive layer.

21. The display film according to claim 15 , further comprising a transparent polymeric substrate layer disposed on the transparent cross-linked polyurethane layer, and the transparent cross-linked polyurethane layer separates the transparent polymeric substrate layer from the protective layer.

22. The display film according to claim 21 , further comprising an adhesive layer disposed on the transparent polymeric substrate layer, and the transparent polymeric substrate layer separates the transparent cross-linked polyurethane layer from the adhesive layer.

23. The display film according to claim 22 , further comprising a release or removable liner disposed on the adhesive layer.

24. The display film according to claim 15 , wherein the transparent cross-linked polyurethane layer has a glass transition temperature of 10 degrees Celsius or less, or 5 degrees Celsius or less, or 0 degrees Celsius or less, or −5 degrees Celsius or less, or in a range from −40 to 5 degrees Celsius, or in a range from −30 to 5 degrees Celsius, or in a range from −20 to 5 degrees Celsius, or in a range from −15 to 5 degrees Celsius, or in a range from −10 to 5 degrees Celsius, or in a range from −5 to 5 degrees Celsius.

25. The display film according to claim 15 , wherein the transparent cross-linked polyurethane layer has a Tan Delta peak value of 0.5 or greater, or 0.8 or greater, or 1.0 or greater, or 1.2 or greater, or in a range from 0.5 to 2.5, or in a range from 1 to 2.5, and the transparent cross-linked polyurethane layer has a cross-link density in a range from 0.1 to 1.0 mol/kg or from 0.2 to 0.9 mol/kg or from 0.37 to 0.74 mol/kg.

26. The display film according to claim 15 , wherein the display film has a haze of 1.0 or less or 0.5 or less and a visible light transmission of 85% or greater, or 90% or greater.

27. The display film according to claim 15 , wherein the transparent cross-linked polyurethane layer has a thickness in a range from 75 to 200 micrometers, or 100 to 200 micrometers, or from 150 to 200 micrometers.

28. The display film according to claim 21 , wherein the transparent polymeric substrate layer, has a thickness in a range from 10 to 125 micrometers, or from 25 to 100 micrometers, or from 30 to 85 micrometers, and a yield stress value greater than 90 MPa, or greater than 100 MPa, or greater than 120 MPa, or greater than 160 MPa.

29. The display film according to claim 15 , wherein the display film has a thickness in a range from 85 to 350 micrometers or from 100 to 300 micrometers or from 150 to 250 micrometers.

30. The display film according to claim 1 , wherein the transparent cross-linked polyurethane layer comprises a plurality of layers, each layer formed of a cross-linked polyurethane material and at least two layers having a different glass transition temperature value.

31. The display film according to claim 1 , wherein a premask layer defines an outer surface of the display film.

32. An article, comprising:

an optical display;

a display film according to claim 1 ; and

an optical adhesive layer fixing the display film to the optical display.

33. The display film according to claim 15 , wherein the transparent cross-linked polyurethane layer comprises a plurality of layers, each layer formed of a cross-linked polyurethane material and at least two layers having a different glass transition temperature value.

34. The display film according to claim 15 , wherein a premask layer defines an outer surface of the display film.

35. An article, comprising:

an optical display;

a display film according to claim 15 ; and

an optical adhesive layer fixing the display film to the optical display.

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Oct 23, 2019
From: THOMPSON, DAVID S.; BRAUN, RYAN M.; RULE, JOSEPH D.; LEATHERDALE, CATHERINE A.; SOLOMONSON, STEVEN D.; CONDO, PETER D.; STRADINGER, JOHN J.; JOHNSON, MICHAEL A.; POKORNY, RICHARD J.; PATZMAN, DEREK W.; ZHANG, PEIHUI; BREEDLOVE, EVAN L.
To: 3M INNOVATIVE PROPERTIES COMPANY
Reel/Frame 050806/0464 →
Continuity (2)
Provisional Application 62357423 · Jul 1, 2016
Related Publication 20200309999A1 · Oct 1, 2020