UV stable assemblies comprising multi-layer optical film

• US 9,945,994 B2
• Filed: 07/01/2013
• Issued: 04/17/2018
• Est. Priority Date: 07/30/2012
• Status: Active Grant

• Current Assignee: 3M Innovative Properties Company (3M Company)
• Original Assignee: 3M Innovative Properties Company (3M Company)
• Inventors: Hebrink, Timothy J., Schardt, Craig R.
• Primary Examiner(s): Won, Bumsuk
• Assistant Examiner(s): MADONNA, JEFFREY E
• Application Number:
  US14/415,967
• Publication Number:
  US 20150177432A1
• Time in Patent Office: 1,751 Days
• Field of Search: 359577-590, 359350-361, 359601-603, 359885
• CPC Class Codes: G02B 19/0042 for use with direct solar radiation
• CPC Class Codes: G02B 5/0841 comprising organic materials, e.g. polymers
• CPC Class Codes: G02B 5/208 for use with infrared or ultraviolet radiation, e.g. for separating visible light from infrared and/or ultraviolet radiation
• CPC Class Codes: G02B 5/22 Absorbing filters G02B5/201 - G02B5/208 take precedence
• CPC Class Codes: G02B 5/223 containing organic substances, e.g. dyes, inks or pigments
• CPC Class Codes: G02B 5/26 Reflecting filters G02B5/28 takes precedence
• CPC Class Codes: G02B 5/283 designed for the ultraviolet
• CPC Class Codes: G02B 6/005 provided by one optical element, or plurality thereof, placed on the light output side of the light guide
• CPC Class Codes: G02B 6/0065 Manufacturing aspects; Material aspects
• CPC Class Codes: G02C 7/10 Filters, e.g. for facilitating adaptation of the eyes to the dark; Sunglasses

Abstract

Assemblies comprising multi-layer optical film comprising optical layers reflecting incident UV and blue light over specified wavelength ranges. Embodiments of the multi-layer optical films are useful, for example, as a UV protective covering. An exemplary UV stable assembly comprises a multi-layer optical film comprising at least a first plurality of first and second optical layers reflecting at least 50 percent of incident UV light over at least a 30 nanometer wavelength range in a wavelength range from at least 300 nanometers to 400 nanometers, and a second plurality of first and second optical layers reflecting at least 50 percent of incident light over at least 30 nanometer wavelength in a wavelength range from at least 430 nanometers to 500 nanometers.

Claims

1. An assembly comprising:

a first multi-layer optical film comprised of at least 100 layers comprising at least first and second optical layers reflecting at least 50 percent of incident light over at least a 30 nanometer wavelength wide reflection band in a wavelength range from at least 430 nanometers to 500 nanometers, wherein the plurality of first and second optical layers is essentially free of 2,6 polyethylenenaphthalate; and

a second multi-layer optical film comprised of at least 100 layers, wherein at least one layer comprising 2,6 polyethylenenaphthalate.

2. The assembly of claim 1, wherein the first multi-layer optical film comprising at least the first and second optical layers comprises an ultraviolet absorber.

3. The assembly of claim 1, wherein the first optical layers of the first multi-layer optical film comprise polymethylmethacrylate, a blend of polymethylmethacrylate and poly(vinylidene fluoride), polycarbonate, polyethylene terephthalate, cyclic olefin copolymer, or thermoplastic polyurethane, and wherein the second optical layers of the multi-layer optical film comprise a copolymer of tetrafluorethylene, hexafluoropropylene, and vinylidene fluoride, polymethylmethacrylate, copolymers of polymethylmethacrylate, or a blend of poly(vinylidene fluoride) and polymethylmethacrylate.

4. A light emitting diode comprising the assembly of claim 1.

5. A light guide comprising the assembly of claim 1.

6. Sunglasses comprising the assembly of claim 1.

7. A wavelength selective solar concentrating mirror comprising the assembly of claim 1.

8. A broadband solar concentrating mirror comprising the assembly of claim 1.

9. The assembly of claim 1 further comprising a reflective polarizer.