Photochromic articles with reduced temperature dependency and methods for preparation
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United States of America Patent
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Jan 22, 2008
Grant Date -
Sep 30, 2004
app pub date -
Mar 20, 2003
filing date -
Mar 20, 2003
priority date (Note) -
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Abstract
Described are photochromic articles that include a substrate, a temperature dependent reducing amount of at least one organic photochromic material (b) that changes from more absorbing to less absorbing of radiation in its activating spectral absorbance as the temperature increases from 10.degree. C. to 35.degree. C. and at least one other photochromic material (c) that is different from photochromic material (b). In the article, photochromic material (b) is interposed between photochromic material (c) and a source of activating radiation. The photochromic article demonstrates a more consistent photochromic response, for example, an optical density response loss of 50 percent or less over a temperature range of from 10.degree. C. to 35.degree. C. as measured in the Photochromic Temperature Dependence Test. Methods for producing the aforedescribed articles are also disclosed.
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