MULTI-LAYER OPTICAL FILMS
First Claim
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1. A UV stable multi-layer optical film comprising at least a plurality of first and second optical layers collectively 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, wherein some of at least one of the first or second optical layers comprises a UV absorber.
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Abstract
Multi-layer optical film (10) comprising optical layers reflecting at least 50 percent of incident UV light over specified wavelength ranges. Embodiments of the multi-layer optical films are useful, for example, as a UV protective covering.
43 Citations
19 Claims
- 1. A UV stable multi-layer optical film comprising at least a plurality of first and second optical layers collectively 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, wherein some of at least one of the first or second optical layers comprises a UV absorber.
- 2. A multi-layer optical film comprising a plurality of at least first and second optical layers having a major surface and collectively 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 third optical layer having first and second generally opposed first and second major surfaces and absorbing 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, wherein the major surface of the plurality of first and second optical layers is proximate to the first major surface of the third optical layer, and wherein there is not another multi-layer optical film proximate the second surface of the third optical layer.
- 4. A multi-layer optical film comprising a first plurality of at least first and second optical layers having a major surface and collectively 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 third optical layer having first and second generally opposed first and second major surfaces and collectively absorbing 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, wherein the major surface of the plurality of first and second optical layers is proximate to the first major surface of the third optical layer, and wherein there is a second plurality of first and second optical layers having a major surface and collectively 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 proximate to the second major surface of the third optical layer.
- 6. A multi-layer optical film comprising a plurality of at least first and second optical layers having opposing first and second major surfaces and collectively 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, a third optical layer having a major surface and absorbing 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 proximate to the first major surface of the plurality of at least first and second optical layers, and a fourth optical layer absorbing 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 proximate to the second major surface of the plurality of at least first and second optical layers.
- 8. A multi-layer optical film comprising at least first and second optical layers reflecting at least 50 percent of incident light over a 30 nanometer wavelength range in a wavelength range from 300 nanometers to 430 nanometers, optionally a third optical layer absorbing at least 50 percent of incident light over at least a 30 nanometer wavelength range in a wavelength range from at least 300 nanometers to 430 nanometers and a fourth optical layer comprising polyethylene naphthalate, wherein at least one of the first, second, or third optical layers absorbs at least 50 percent of incident light over at least a 30 nanometer wavelength range in a wavelength range from at least 300 nanometers to 430 nanometers.
Specification