Patent ID: 7320826
Filing Date: 2008-01-22
Classification: C07D,C09K,Y10S,Y10T

Abstract:
1. A photochromic article demonstrating consistent photochromic response over a broad temperature range comprising: a) a substrate; b) a temperature dependent reducing amount of at least one organic photochromic material associated with said substrate, said photochromic material having a temperature dependent variable absorbance that changes from more absorbing to less absorbing of radiation in its activating spectral absorbance as the temperature increases from 10° C. to 35° C.; and c) at least one other organic photochromic material (c) associated with said substrate that is different from photochromic material (b); said photochromic material (b) being used in a coating or film on the surface of the substrate and interposed between photochromic material (c) and a source of activating radiation, wherein the substituent groups of photochromic material (b) are chosen such that said photochromic article exhibits an activated optical density response loss of 50 percent or less as measured in the Photochromic Temperature Dependence Test, said photochromic material (b) being chosen from: (1) a naphthopyran compound represented by the following graphic formula I: wherein (a) R wherein -Z is —C(O)— or —CH (b) R wherein each Y is —CH wherein R 19 , R 20 and R 21 are each independently chosen for each occurrence in each formula from hydrogen or C 1 -C 6 alkyl, or the groups R 19 and R 20 together form a ring of 5 to 8 carbon atoms and each R 18 is C 1 -C 6 alkyl and p being the integer 0, 1, 2 or 3; (c) R (d) B and B′ are each independently chosen from: (2) a naphthopyran compound represented by the following graphic formula II: wherein; R (3) a naphthopyran compound represented by graphic formula III: wherein; R (4) a naphthopyran compound represented by the following graphic formula IV: wherein; (a) R (b) R (c) R wherein J and K are each independently chosen for each occurrence in each formula from oxygen or the group —N(R (5) a naphthopyran represented by the following graphic formula V: wherein; (a) R (b) R (c) B and B′ are the same groups described hereinbefore in (1) (d); (6) a naphthopyran compound represented by the following graphic formula VI: wherein (a) R (b) R (c) B and B′ are the same groups described hereinbefore in (1) (d); and (7) a naphthopyran represented by the following graphic formula VII: wherein: each R (8) a naphthopyran represented by the following graphic formula VIII: wherein, (a) R (b) each R (c) D is oxygen or —N(R (d) E is oxygen, —N(R (e) M and M′ are each chosen from the urisubstituted, mono—, di- or tri-substituted aryl group, phenyl or naphthyl; each of said aryl substituents being chosen from hydroxy, phenyl, morpholino, naphthylaryl(C (9) mixtures thereof.