MATERIALS AND CONFIGURATIONS FOR REDUCING WARPAGE IN OPTICAL FILMS

• US 20090123668A1
• Filed: 01/21/2009
• Published: 05/14/2009
• Est. Priority Date: 05/01/2003
• Status: Abandoned Application

• Current Assignee: 3M Innovative Properties Company (3M Company)
• Original Assignee: 3M Innovative Properties Company (3M Company)
• Inventors: Rosell, Barry S., Hebrink, Timothy J., Strobel, Joan M., Hamer, Kevin M.
• Application Number:
  US12/356,924
• Publication Number:
  US 20090123668A1
• Time in Patent Office: Days
• US Class Current: 428/1.500
• CPC Class Codes: B32B 2307/42 Polarizing, birefringent, filtering
• CPC Class Codes: B32B 2307/734 Dimensional stability
• CPC Class Codes: B32B 2551/00 Optical elements
• CPC Class Codes: B32B 27/08 of synthetic resin
• CPC Class Codes: B32B 27/30 comprising vinyl (co)polymers; comprising acrylic (co)polymers
• CPC Class Codes: B32B 27/302 comprising aromatic vinyl (co)polymers, e.g. styrenic (co)polymers
• CPC Class Codes: B32B 27/36 comprising polyesters
• CPC Class Codes: C09K 2323/05 Bonding or intermediate layer characterised by chemical composition, e.g. sealant or spacer
• CPC Class Codes: G02B 1/10 Optical coatings produced by application to, or surface treatment of, optical elements G02B1/08 takes precedence
• CPC Class Codes: G02B 1/14 Protective coatings, e.g. hard coatings
• CPC Class Codes: G02B 1/16 having an anti-static effect, e.g. electrically conducting coatings
• CPC Class Codes: G02B 5/305 including organic materials, e.g. polymeric layers
• CPC Class Codes: Y10T 428/2486 with outer strippable or release layer
• CPC Class Codes: Y10T 428/2839 with release or antistick coating
• CPC Class Codes: Y10T 428/31909 Next to second addition polymer from unsaturated monomers

Abstract

A multilayer optical body is disclosed and includes a light reflecting element formed from a first polymer material and a second polymer material having an index of refraction difference sufficient to reflect light of at least one polarization, and at least one non-optical warp-resistant layer disposed on the light reflecting element. The at least one non-optical one warp-resistant layer includes an intimate mixture of i) polystyrene or a first polystyrene copolymer and ii) a second polystyrene copolymer or ii) a polyester or copolyester.

Claims

1. An optical body, comprising:

a light reflecting element comprising a first polymer material and a second polymer material having an index of refraction difference sufficient to reflect light of at least one polarization; and

at least one non-optical warp-resistant layer disposed on the light reflecting element, the at least one non-optical one warp-resistant layer comprising an intimate mixture of i) polystyrene or a first polystyrene copolymer and ii) a second polystyrene copolymer.

2. The optical body of claim 1, wherein the optical body comprises at least two non-optical warp-resistant layers disposed with one of the non-optical warp-resistant layers disposed on each of two opposing sides of the light reflecting element.

3. The optical body of claim 1, wherein the at least one warp-resistant layer comprises i) a first polystyrene copolymer and ii) a second polystyrene copolymer.

4. The optical body of claim 3, wherein the first polystyrene copolymer is styrene acrylonitrile copolymer.

5. The optical body of claim 4, wherein the second polystyrene copolymer is selected from acrylonitrile butadiene styrene copolymers, styrene butadiene copolymers, acrylic styrene acrylonitrile copolymers, and styrene methyl methacrylate copolymers.

6. The optical body of claim 3, wherein the second polystyrene copolymer is provided in an amount of 3 to 30 wt. % based on the total weight of the non-optical warp-resistant layer.

7. The optical body of claim 1, wherein the non-optical warp-resistant layer further comprises a material selected from coPEN or coPET.

8. The optical body of claim 3, wherein the second polystyrene copolymer is acrylonitrile butadiene styrene copolymer.

9. The optical body of claim 1, wherein the optical film is a multilayer, polymeric optical film wherein the first polymer material forms a plurality of first optical layers and the second polymer material forms a plurality of second optical layers.

10. The optical body of claim 1, further comprising at least one strippable skin layer disposed over the at least one non-optical warp-resistant layer and the at least one strippable skin layer comprises a polyolefin.

11. The optical body of claim 10, wherein the polyolefin is selected from syndiotactic polypropylene, ethylene octene copolymers, copolymers of polypropylene/polyethylene, and blends thereof.

12. An optical body, comprising:

a light reflecting element comprising a first polymer material and a second polymer material having an index of refraction difference sufficient to reflect light of at least one polarization; and

at least one non-optical warp-resistant layer disposed on the light reflecting element, the at least one non-optical one warp-resistant layer comprising an intimate mixture of i) polystyrene or a polystyrene copolymer and ii) a polyester or copolyester.

13. The optical body of claim 12, wherein the optical body comprises at least two non-optical warp-resistant layers disposed with one of the non-optical warp-resistant layers disposed on each of two opposing sides of the light reflecting element.

14. The optical body of claim 12, wherein the at least one warp-resistant layer comprises i) a polystyrene copolymer and ii) a copolyester.

15. The optical body of claim 14, wherein the polystyrene copolymer is styrene acrylonitrile copolymer.

16. The optical body of claim 15, wherein the copolyester is a co-polyethylene naphthalate or a co-polyethylene terephthalate.

17. The optical body of claim 16, wherein the co-polyethylene naphthalate or co-polyethylene terephthalate has a lower glass transition temperature than the polystyrene copolymer.

18. The optical body of claim 12, wherein the optical film is a multilayer, polymeric optical film wherein the first polymer material forms a plurality of first optical layers and the second polymer material forms a plurality of second optical layers.

19. The optical body of claim 12, further comprising at least one strippable skin layer disposed over the at least one non-optical warp-resistant layer and the at least one strippable skin layer comprises a polyolefin.

20. The optical body of claim 12, wherein the polyester or copolyester is provided in an amount of 1 to 30 wt. % based on the total weight of the non-optical warp-resistant layer.