Composition comprising photochromic dyes in an ionic solvent
AssigneeEssilor International (Compagnie Generale d'Optique)
InventorsSamuel Archambeau, Jean-Paul Cano, Corinne Galley, Francois Malbosc
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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.
Claims12
A single-phase photochromic composition which is liquid at 20° C. and which comprises:
- (a) at least one photochromic dye chosen from the group consisting of spirooxazines, spiroindoline[2,3]benzoxazines, chromenes, homoazaadamantane spirooxazines, spirofluorene-(2H)-benzopyrans, naphtho[2,1-b]pyrans and naphtho[1,2-b]pyrans, and
- (b) an ionic solvent.
Dependencies are inferred from the claim text.