Protection film suitable for illuminated display devices

• US 10,185,058 B2
• Filed: 04/14/2014
• Issued: 01/22/2019
• Est. Priority Date: 07/01/2013
• Status: Active Grant

• Current Assignee: 3M Innovative Properties Company (3M Company)
• Original Assignee: 3M Innovative Properties Company (3M Company)
• Inventors: Snyder, Thomas M., Toy, Michelle L., Tapio, Scott M., Sherman, Audrey A., Noyola, Joan M., Bisek, Patrick E., Baetzold, John P., Stradinger, John J.
• Primary Examiner(s): Ducheneaux, Frank D
• Application Number:
  US14/787,619
• Publication Number:
  US 20160103250A1
• Time in Patent Office: 1,744 Days
• Field of Search: None
• CPC Class Codes: B32B 1/00 Layered products having a non-planar shape
• CPC Class Codes: B32B 3/02 characterised by features of form at particular places, e.g. in edge regions non-uniform thickness B32B3/263
• CPC Class Codes: C09J 2203/318 for the production of liquid crystal displays
• CPC Class Codes: C09J 2301/204 the adhesive coating being discontinuous
• CPC Class Codes: C09J 2301/302 the adhesive being pressure-sensitive, i.e. tacky at temperatures inferior to 30°C
• CPC Class Codes: C09J 7/20 characterised by their carriers
• CPC Class Codes: C09J 7/38 Pressure-sensitive adhesives [PSA]
• CPC Class Codes: G02B 1/14 Protective coatings, e.g. hard coatings
• CPC Class Codes: G02F 1/1333 Constructional arrangements; Manufacturing methodsG02F1/135, G02F1/136 take precedence
• CPC Class Codes: G02F 2201/50 Protective arrangements
• CPC Class Codes: Y10T 428/24628 Nonplanar uniform thickness material
• CPC Class Codes: Y10T 428/24777 Edge feature

Abstract

The present invention relates to protection films comprising an optical film suitably sized for an illuminated display device, the optical film having perimeter surface portions defining a central region. The protection film further comprises a pressure sensitive adhesive layer at the perimeter surface portions of the optical film. The optical film and/or pressure sensitive adhesive layer has been adapted such that the at least the central region of the optical film contacts the illuminated display device or the central region of the optical film is bonded to the illuminated display device by means of a self-wetting layer. The protection film may be preassembled or may be provided as a kit, the kit comprising an optical film and a double-faced pressure sensitive tape.

Claims

1. A protection film comprising:

an optical film suitably sized for an illuminated display device, the optical film having a major surface comprising perimeter surface portions defining a central region; and

a pressure sensitive adhesive layer disposed at perimeter surface portions such that the central region is free of pressure sensitive adhesive;

wherein the protection film is curved such that opposing edges that define the thickness of the protection film are spaced above a reference plane by a distance of at least 1 mm when the protection film is placed on the reference plane such that the central region is flush with the reference plane;

wherein the protection film is curved by at least one of (1) the optical film having a tension differential between at least two layers, (2) the optical film including a heat shrinkable film, (3) the optical film including a coating composition having sufficient shrinkage to induce curvature, or (4) the protection film having rolled been upon itself forming a hollow tube.

2. The protection film of claim 1 further comprising a release liner disposed on the pressure sensitive adhesive layer and the protection film is curved after the release liner is removed.

3. The protection film of claim 2 wherein the protection film is not curved prior to the release liner being removed.

4. The protection film of claim 1 wherein the opposing edges are parallel to the longest dimension of the major surface the protection film.

5. The protection film of claim 1 wherein the opposing edges are parallel to the shortest dimension of the major surface of the protection film.

6. The protection film of claim 1 wherein the protection film is rectangular having corners and the outermost edge of each corner is spaced from the reference plane by a distance of at least 1 mm.

7. The protection film of claim 1 wherein the opposing edges spaced from the reference plane by a distance up to 10% of a maximum dimension of the protection film.

8. The protection film of claim 1 wherein the optical film or protection film has a tension different between at least two layers to induce curvature.

9. The protection film of claim 1 wherein the optical film comprises a coating composition on at least a portion of at least one major surface and the coating composition has sufficient shrinkage to induce curvature.

10. The protection film of claim 1 wherein the protection film is provided in a form wherein the protection film is rolled upon itself forming a hollow tube to induce curvature.