Optical bodies including strippable boundary layers

• US 10,228,502 B2
• Filed: 04/27/2017
• Issued: 03/12/2019
• Est. Priority Date: 04/06/2005
• Status: Active Grant

• Current Assignee: 3M Innovative Properties Company (3M Company)
• Original Assignee: 3M Innovative Properties Company (3M Company)
• Inventors: Stover, Carl A., Hebrink, Timothy J., Denker, Martin E., Jackson, Jeffery N., Derks, Kristopher J.
• Primary Examiner(s): Vargot, Mathieu D
• Application Number:
  US15/499,727
• Publication Number:
  US 20170227699A1
• Time in Patent Office: 684 Days
• CPC Class Codes: B29C 55/023 using multilayered plates or sheets
• CPC Class Codes: B29C 55/08 transverse to the direction of feed
• CPC Class Codes: B29D 11/00644 polarizing
• CPC Class Codes: B29K 2067/00 Use of polyesters or derivatives thereof, as moulding material
• CPC Class Codes: B29K 2067/003 PET, i.e. poylethylene terephthalate
• CPC Class Codes: B32B 2307/42 Polarizing, birefringent, filtering
• CPC Class Codes: B32B 27/00 Layered products comprising a layer of synthetic resin fibrous or filamentary layer made of a synthetic resin B32B5/02; particulate layer made of a synthetic resin B32B5/16; foamed layer made of a synthetic resin B32B5/18
• CPC Class Codes: B32B 27/36 comprising polyesters
• CPC Class Codes: G02B 5/3041 comprising multiple thin layers, e.g. multilayer stacks
• CPC Class Codes: G02B 5/3083 Birefringent or phase retarding elements G02B5/3008, G02B5/3016 take precedence; systems for polarisation control G02B27/286; manufacturing phase modulating patterns by lithographic processes G03F7/001

Abstract

The present disclosure is directed to optical bodies including a first optical film, a second optical film and one or more strippable boundary layers disposed between the first and second optical films. Each major surface of a strippable boundary layer may be disposed adjacent to an optical film or another strippable boundary layer. At least one of the first and second optical films may include a reflective polarizer. The present disclosure is also directed to methods of processing such optical bodies.

Claims

1. An optical body comprising a first optical film, a second optical film and one or more strippable boundary layers strippable with a peel force of less than 50 g/in disposed between the first and second optical films such that each major surface of a strippable boundary layer is attached to an optical film or another strippable boundary layer, wherein at least one of the first and second optical films comprises a reflective polarizer including packets of optical layers, wherein at least one strippable boundary layer is a rough strippable boundary layer, wherein the reflective polarizer comprises at least one material with indices of refraction in a length direction and a thickness direction that are substantially the same but substantially different from an index of refraction in a width direction and one or more non-strippable protective boundary layers between the packets of optical layers.

2. An optical body of claim 1, wherein the reflective polarizer comprises at least one material with indices of refraction in a length direction and a thickness direction that differ by no more than 0.08.

3. An optical body of claim 1, wherein the reflective polarizer comprises at least one material with indices of refraction in a length direction and a thickness direction that differ by no more than 0.04.

4. An optical body of claim 1, wherein the reflective polarizer comprises at least one material with indices of refraction in a length direction and a thickness direction that differ by no more than 0.02.

5. The optical body of claim 2, wherein the at least one material has an in-plane birefringence of at least 0.1.

6. The optical body of claim 1, further comprising a third optical film and at least one additional strippable boundary layer disposed between the third optical film and the second optical film.

7. The optical body of claim 1, wherein the reflective polarizer is a multilayer reflective polarizer comprising a plurality of first and second optical layers.

8. The optical body of claim 7, wherein the reflective polarizer has from 2 to 5000 optical layers.

9. The optical body of claim 1, wherein the rough strippable boundary layer imparts a surface texture including depressions into surfaces of the first and second optical films, wherein the surfaces of the first and second optical films are disposed adjacent to the rough strippable boundary layer.

10. The optical body of claim 1, wherein the at least one rough strippable boundary layer disposed adjacent to an optical film comprises a plurality of protruded surface structures and the adjacent surface of the optical film comprises a plurality of depressed surface structures corresponding to the plurality of protruded surface structures.

11. The optical body of claim 1, wherein a strippable boundary layer comprises at least one of:

a fluropolymer, a polypropylene, a modified polypropylene, an aliphatic polyolefin, a polyethylene, a polyethylene copolymer, polymethylpentene, a cyclic olefin copolymer, a syndiotactic polymer, an atactic vinyl aromatic polymer, a polysyrene, and a copolymer of styrene.

12. The optical body of claim 1, further comprising at least one outer skin layer.