DOUBLE WAVELENGTH-REFLECTIVE MULTI-LAYER FILM
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United States of America Patent
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Jan 17, 2013
app pub date -
Dec 14, 2010
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Dec 22, 2009
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Abstract
A double wavelength-reflective multi-layer film comprising a reflective layer part composed of at least one resin layer A and at least one resin layer B which are alternatively stacked, the resin layers A and B having refractive indexes different from each other and having a standard deviation in the thickness ranging from 6 to 30 nm, wherein the multi-layer film has an f-ratio of 0.01 to 0.99, is capable of reflecting two visible light wavelength regions in the form of one stack.
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