PHOTOCHROMIC POLYCARBONATE COMPOSITIONS, METHODS OF MANUFACTURE, AND ARTICLES COMPRISING THE SAME
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United States of America Patent
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Jan 12, 2017
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Jan 23, 2015
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Jan 24, 2014
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Abstract
A photochromic polycarbonate composition including: a polycarbonate comprising bisphenol A carbonate units; a cycloaliphatic polyester comprising units of the formula (5) wherein R is a C2-12 alkylene or a C3-12 cycloalkylene; and a photo-chromic dye; wherein the composition has a transmission of 80% or more and a haze of 3% or less, measured according to ASTM D1003 (2007) using the color space CIE1931 (Illuminant C and a 2° observer) at a thickness of 1.5 mm.
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