All-polymeric ultraviolet light reflecting film
First Claim
1. An ultraviolet light reflective all-polymeric film of at least first and second diverse polymeric materials which do not absorb significant amounts of ultraviolet radiation, said at least first and second polymeric materials are selected from the group consisting of polymethyl methacrylate, polyvinylidene fluoride, polychlorotrifluoroethylene, and polymethylpentene-1, the film comprising a sufficient number of alternating layers of at least said first and second polymeric materials which form predetermined repeating units such that at least 30% of ultraviolet light of a wavelength of between about 300-400 nm incident on said film is reflected, said first and second polymeric materials having an average percent transmission of greater then about 50% between wavelengths of 300-400 nm, a substantial majority of the individual layers of said film having optical thicknesses in the range where the sum of the optical thicknesses in one of said repeating units of said polymeric materials is between about 0.15 μ
- m to about 0.228 μ
m, and wherein said first and second polymeric materials differ from each other in refractive index by at least about 0.03 in the wavelength range of from about 300-400 nm.
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Accused Products
Abstract
An all-polymeric ultraviolet light reflective film which is lower in cost than previously used reflector materials, is weather resistant, and which does not absorb significant amounts of solar ultraviolet energy is provided. The film includes a sufficient number of alternating layers of at least first and second diverse polymeric materials which have an average percent transmission of greater than about 50% between wavelengths of 300-400 nm. A substantial majority of the individual layers of the film have optical thicknesses in the range where the sum of the optical thicknesses in a repeating unit of the polymeric materials is between about 0.15 μm to about 0.228 μm, and the first and second polymeric materials differ from each other in refractive index by at least about 0.03 in the wavelength range of from about 300-400 nm. The reflective film is useful as a reflective material in solar detoxification systems, as a protective material in indoor and outdoor lighting systems, as a UV mirror in the fields of medical imaging, astronomical telescopes, and microscopy or in chemical reactions using UV radiation.
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Citations
12 Claims
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1. An ultraviolet light reflective all-polymeric film of at least first and second diverse polymeric materials which do not absorb significant amounts of ultraviolet radiation, said at least first and second polymeric materials are selected from the group consisting of polymethyl methacrylate, polyvinylidene fluoride, polychlorotrifluoroethylene, and polymethylpentene-1, the film comprising a sufficient number of alternating layers of at least said first and second polymeric materials which form predetermined repeating units such that at least 30% of ultraviolet light of a wavelength of between about 300-400 nm incident on said film is reflected, said first and second polymeric materials having an average percent transmission of greater then about 50% between wavelengths of 300-400 nm, a substantial majority of the individual layers of said film having optical thicknesses in the range where the sum of the optical thicknesses in one of said repeating units of said polymeric materials is between about 0.15 μ
- m to about 0.228 μ
m, and wherein said first and second polymeric materials differ from each other in refractive index by at least about 0.03 in the wavelength range of from about 300-400 nm. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
- m to about 0.228 μ
Specification