Photochromic compound and articles containing the same

Details Photochromic compound and articles containing the same Photochromic compound and articles containing the same

C - Chemistry, Metallurgy

07

D

96/150, 260/244.

C07D 498/20 (2006.01) G03C 1/685 (2006.01)

Patent

CA 1248946

ABSTRACT OF THE DISCLOSURE Photochromic compounds represented by the graphic formula: Image wherein: (a) R1 is selected from the group consisting of C1-C8 alkyl, phenyl, phen(C1-C4) alkyl, allyl and mono- and di- substituted phenyl, said substitu- ents being selected from C1-C4 alkyl and C1-C5 alkoxy; (b) R2 and R3 are each selected from the group con- sisting of C1-C5 alkyl, phenyl, C1-C4 alkyl and C1-C5 alkoxy mono- and disubstituted phenyl, benzyl or combined to form a cyclic ring selected from the group consisting of an alicyclic ring containing from 6 to 8 carbon atoms (including the spiro carbon atom), norbornyl and adamantyl, and (c) R4 and R5 are each selected from the group con- sisting of hydrogen, C1-C5 alkyl, halogen, C1-C5 alkoxy, nitro, cyano and C1-C8 alkoxy- carbonyl are described. Solvent systems which form photochromic compositions with the above compounds and articles containing the photochromic compound are described, The compound or compositions typically change from a color- less (nonexcited) or pale color, e.g., yellow, to blue after exposure to ultraviolet light.

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