Multilayer Films Of Plasticizer-Containing Polyvinyl Acetal With Photochromic Properties
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United States of America Patent
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Apr 14, 2016
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Sep 15, 2015
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Oct 8, 2014
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Abstract
Photochromic interlayer films for laminated glass are composed of at least two individual films based on plasticizer-containing polyvinyl acetal, individual films of the interlayer film containing at least one photochromic compound, wherein the individual films having photochromic compounds have glass transition temperatures which differ from each other by at least 5 K.
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