Composition comprising photochromic dyes in an ionic solvent
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United States of America Patent
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Apr 2, 2013
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app pub date -
Mar 2, 2009
filing date -
Mar 5, 2008
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Abstract
A photochromic composition that is liquid at 20° C. and includes (a) at least one photochromic dye and (b) an ionic solvent selected from (b)(i) room-temperature ionic liquids (RTIL), (b)(ii) ionic liquid mixtures that are liquid at room temperature, and (b)(iii) room-temperature liquid mixtures of at least one ionic liquid and at least one organic solvent that is miscible therewith. The use of said photochromic composition in optical devices such as ophthalmic lenses is also described.
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