Photochromic substituted naphthopyran compounds

Claim 2

A naphthopyran compound represented by the following graphic formula: ##STR10## wherein: (a) R 1 is hydrogen or a C 1 -C 6 alkyl; R 2 is hydrogen or the group, --C(O)W, W being --OR 4 or --N(R 5 )R 6 , wherein R 4 is hydrogen, allyl, C 1 -C 6 alkyl, phenyl, C 1 -C 6 monoalkyl substituted phenyl, C 1 -C 6 monoalkoxy substituted phenyl, phenyl(C 1 -C 3 )alkyl, C 1 -C 6 monoalkyl substituted phenyl(C 1 -C 3 )alkyl, C 1 -C 6 monoalkoxy substituted phenyl(C 1 -C 3 )alkyl, C 1 -C 6 alkoxy(C 2 -C 4 )alkyl, or C 1 -C 6 monohaloalkyl, and wherein R 5 and R 6 are each selected from the group consisting of hydrogen, C 1 -C 6 alkyl, C 5 -C 7 cycloalkyl, phenyl and mono- or di-substituted phenyl, or R 5 and R 6 together with the nitrogen form a mono- or di-substituted or unsubstituted heterocyclic ring selected from the group consisting of indolinyl, morpholino, piperidino, 1-pyrrolidyl, 1-pyrrolinyl, 1-imidazolidyl, 2-imidazolin-1-yl, 2-pyrazolidyl and 1-piperazinyl, said phenyl and heterocyclic ring substituents being selected from C 1 -C 6 alkyl and C 1 -C 6 alkoxy and said halo substituent being chloro or fluoro; R 3 is hydrogen, C 1 -C 6 alkyl, phenyl(C 1 -C 3 )alkyl, C 1 -C 6 monoalkyl substituted phenyl(C 1 -C 3 )alkyl, C 1 -C 6 monoalkoxy substituted phenyl(C 1 -C 3 )alkyl, C 1 -C 6 alkoxy(C 2 -C 4 )alkyl, C 5 -C 7 cycloalkyl, C 1 -C 4 monoalkyl substituted C 5 -C 7 cycloalkyl, C 1 -C 6 monohaloalkyl, allyl or the group, --C(O)X, wherein X is a C 1 -C 6 alkyl, phenyl, C 1 -C 6 mono-or C 1 -C 6 di-alkyl substituted phenyl, C 1 -C 6 mono- or C 1 -C 6 di-alkoxy substituted phenyl, C 1 -C 6 alkoxy, phenoxy, C 1 -C 6 mono- or C 1 -C 6 di-alkyl substituted phenoxy, C 1 -C 6 mono- or C 1 -C 6 di-alkoxy substituted phenoxy, C 1 -C 6 alkylamino, phenylamino, C 1 -C 6 mono- or C 1 -C 6 di-alkyl substituted phenylamino, or C 1 -C 6 mono- or C 1 -C 6 di-alkoxy substituted phenylamino, and said halo substituent being chloro, fluoro or bromo, provided that one of R 1 or R 2 is hydrogen; (b) B is selected from the group consisting of the substituted or unsubstituted aryl groups phenyl and naphthyl, and (c) B' is selected from the group consisting of the substituted or unsubstituted heterocyclic aromatic groups pyridyl, furyl, benzofuryl, thienyl, and benzothienyl, said aryl and heterocyclic substituents being selected from the group consisting of hydroxy, C 1 -C 5 alkyl, C 1 -C 5 haloalkyl, C 1 -C 5 alkoxy, C 1 -C 5 alkoxy(C 1 -C 4 )alkyl, C 1 -C 5 dialkylamino, acryloxy, methacryloxy, and halogen, said halogen or (halo) groups being fluoro, chloro, or bromo.

Claim 3

The naphthopyran of claim 1 wherein B is a phenyl group; represented respectively by the following graphic formulae: ##STR11## wherein, Y 1 is selected from the group consisting of C 1 -C 5 alkyl, C 1 -C 5 alkoxy, fluoro, and chloro, Z 1 is selected from the group consisting of hydrogen and Y 1 , each Y 2 and Z 2 are selected from the group consisting of C 1 -C 5 alkyl, C 1 -C 5 alkoxy, hydroxy, halogen, acryloxy, and methacryloxy, and a and b are each integers of from 0 to 2.

Claim 4

The naphthopyran of claim 2 wherein R 1 is hydrogen or methyl; R 2 is hydrogen or the group, --C(O)W, W being --OR 4 , wherein R 4 is C 1 -C 3 alkyl or allyl; and R 3 is hydrogen, C 1 -C 3 alkyl, phenyl(C 1 -C 3 )alkyl, or the group, --C(O)X wherein X is a C 1 -C 4 alkyl.

Claim 5

The naphthopyran of claim 3 wherein Y 1 is C 1 -C 3 alkyl, C 1 -C 3 alkoxy, or fluoro, Z 1 is a hydrogen, each Y 2 and Z 2 is selected from the group consisting of C 1 -C 3 alkyl and C 1 -C 3 alkoxy, a is the integer 0 or 1, and b is an integer from 0 to 2.

Claim 6

A photochromic article comprising an organic host material and a photochromic amount of a naphthopyran compound represented by the following graphic formula: ##STR12## wherein: (a) R 1 is hydrogen or a C 1 -C 6 alkyl; R 2 is hydrogen or the group, --C(O)W, W being --OR 4 or --N(R 5 )R 6 , wherein R 4 is hydrogen, allyl, C 1 -C 6 alkyl, phenyl, C 1 -C 6 monoalkyl substituted phenyl, C 1 -C 6 monoalkoxy substituted phenyl, phenyl(C 1 -C 3 )alkyl, C 1 -C 6 monoalkyl substituted phenyl(C 1 -C 3 )alkyl, C 1 -C 6 monoalkoxy substituted phenyl(C 1 -C 3 )alkyl, C 1 -C 6 alkoxy(C 2 -C 4 )alkyl, or C 1 -C 6 monohaloalkyl, and wherein R 5 and R 6 are each selected from the group consisting of hydrogen, C 1 -C 6 alkyl, C 5 -C 7 cycloalkyl, phenyl and mono- or di-substituted phenyl, or R 5 and R 6 together with the nitrogen form a mono- or di-substituted or unsubstituted heterocyclic ring selected from the group consisting of indolinyl, morpholino, piperidino, 1-pyrrolidyl, 1-pyrrolinyl, 1-imidazolidyl, 2-imidazolin-1-yl, 2-pyrazolidyl and 1-piperazinyl, said phenyl and heterocyclic ring substituents being selected from C 1 -C 6 alkyl and C 1 -C 6 alkoxy and said halo substituent being chloro or fluoro; R 3 is hydrogen, C 1 -C 6 alkyl, phenyl(C 1 -C 3 )alkyl, C 1 -C 6 monoalkyl substituted phenyl(C 1 -C 3 )alkyl, C 1 -C 6 monoalkoxy substituted phenyl(C 1 -C 3 )alkyl, C 1 -C 6 alkoxy(C 2 -C 4 )alkyl, C 5 -C 7 cycloalkyl, C 1 -C 4 monoalkyl substituted C 5 -C 7 cycloalkyl, C 1 -C 6 monohaloalkyl, allyl or the group, --C(O)X, wherein X is a C 1 -C 6 alkyl, phenyl, C 1 -C 6 mono-or C 1 -C 6 di-alkyl substituted phenyl, C 1 -C 6 mono- or C 1 -C 6 di-alkoxy substituted phenyl, C 1 -C 6 alkoxy, phenoxy, C 1 -C 6 mono- or C 1 -C 6 di-alkyl substituted phenoxy, C 1 -C 6 mono- or C 1 -C 6 di-alkoxy substituted phenoxy, C 1 -C 6 alkylamino, phenylamino, C 1 -C 6 mono- or C 1 -C 6 di-alkyl substituted phenylamino, or C 1 -C 6 mono- or C 1 -C 6 di-alkoxy substituted phenylamino, and said halo substituent being chloro, fluoro or bromo, provided that one of R 1 or R 2 is hydrogen; and (b) B is selected from the group consisting of the substituted or unsubstituted aryl groups phenyl and naphthyl, and (c) B' is selected from the group consisting of the substituted or unsubstituted heterocyclic aromatic groups pyridyl, furyl, benzofuryl, thienyl, and benzothienyl, said aryl and heterocyclic substituents being selected from the group consisting of hydroxy, C 1 -C 5 alkyl, C 1 -C 5 haloalkyl, C 1 -C 5 alkoxy, C 1 -C 5 alkoxy(C 1 -C 4 )alkyl, C 1 -C 5 dialkylamino, acryloxy, methacryloxy, and halogen, said halogen or (halo) groups being fluoro, chloro, or bromo.

Claim 7

A photochromic article comprising an organic host material and a photochromic amount of a naphthopyran compound represented by the following graphic formula: ##STR12## wherein: (a) R 1 is hydrogen or a C 1 -C 6 alkyl; R 2 is hydrogen or the group, --C(O)W, W being --OR 4 or --N(R 5 )R 6 , wherein R 4 is hydrogen, allyl, C 1 -C 6 alkyl, phenyl, C 1 -C 6 monoalkyl substituted phenyl, C 1 -C 6 monoalkoxy substituted phenyl, phenyl(C 1 -C 3 )alkyl, C 1 -C 6 monoalkyl substituted phenyl(C 1 -C 3 )alkyl, C 1 -C 6 monoalkoxy substituted phenyl(C 1 -C 3 )alkyl, C 1 -C 6 alkoxy(C 2 -C 4 )alkyl, or C 1 -C 6 monohaloalkyl, and wherein R 5 and R 6 are each selected from the group consisting of hydrogen, C 1 -C 6 alkyl, C 5 -C 7 cycloalkyl, phenyl and mono- or di-substituted phenyl, or R 5 and R 6 together with the nitrogen form a mono- or di-substituted or unsubstituted heterocyclic ring selected from the group consisting of indolinyl, morpholino, piperidino, 1-pyrrolidyl, 1-pyrrolinyl, 1-imidazolidyl, 2-imidazolin-1-yl, 2-pyrazolidyl and 1-piperazinyl, said phenyl and heterocyclic ring substituents being selected from C 1 -C 6 alkyl and C 1 -C 6 alkoxy and said halo substituent being chloro or fluoro; R 3 is hydrogen, C 1 -C 6 alkyl, phenyl(C 1 -C 3 )alkyl, C 1 -C 6 monoalkyl substituted phenyl(C 1 -C 3 )alkyl, C 1 -C 6 monoalkoxy substituted phenyl(C 1 -C 3 )alkyl, C 1 -C 6 alkoxy(C 2 -C 4 )alkyl, C 5 -C 7 cycloalkyl, C 1 -C 4 monoalkyl substituted C 5 -C 7 cycloalkyl, C 1 -C 6 monohaloalkyl, allyl or the group, --C(O)X, wherein X is a C 1 -C 6 alkyl, phenyl, C 1 -C 6 mono-or C 1 -C 6 di-alkyl substituted phenyl, C 1 -C 6 mono- or C 1 -C 6 di-alkoxy substituted phenyl, C 1 -C 6 alkoxy, phenoxy, C 1 -C 6 mono- or C 1 -C 6 di-alkyl substituted phenoxy, C 1 -C 6 mono- or C 1 -C 6 di-alkoxy substituted phenoxy, C 1 -C 6 alkylamino, phenylamino, C 1 -C 6 mono- or C 1 -C 6 di-alkyl substituted phenylamino, or C 1 -C 6 mono- or C 1 -C 6 di-alkoxy substituted phenylamino, and said halo substituent being chloro, fluoro or bromo, provided that one of R 1 or R 2 is hydrogen; and (b) B is selected from the group consisting of the substituted or unsubstituted aryl groups phenyl and naphthyl, and (c) B' is selected from the group consisting of the substituted or unsubstituted heterocyclic aromatic groups pyridyl, furyl, benzofuryl, thienyl, and benzothienyl, said aryl and heterocyclic substituents being selected from the group consisting of hydroxy, C 1 -C 5 alkyl, C 1 -C 5 haloalkyl, C 1 -C 5 alkoxy, C 1 -C 5 alkoxy(C 1 -C 4 )alkyl, C 1 -C 5 dialkylamino, acryloxy, methacryloxy, and halogen, said halogen or (halo) groups being fluoro, chloro, or bromo.

Claim 8

The photochromic article of claim 5 wherein the organic host material is selected from the group consisting of polyacrylates, cellulose acetate, cellulose triacetate, cellulose acetate propionate, cellulose acetate butyrate, poly(vinyl acetate), poly(vinyl alcohol), poly(vinyl chloride), poly(vinylidene chloride), polycarbonate, polyurethanes, poly(ethylene terephthalate), polystyrene, copoly(styrene-methylmethacrylate), copoly(styrene-acrylonitrile, polyvinylbutyral and polymers of members of the group consisting of polyol(allyl carbonate) monomers, polyfunctional acrylate monomers, and diallylidene pentaerythritol monomers.

Claim 9

The photochromic article of claim 6 wherein B is a phenyl group; represented respectively by the following graphic formulae: ##STR13## wherein, Y 1 is selected from the group consisting of C 1 -C 5 alkyl, C 1 -C 5 alkoxy, fluoro, and chloro, Z 1 is selected from the group consisting of hydrogen and Y 1 , each Y 2 and Z 2 are selected from the group consisting of C 1 -C 5 alkyl, C 1 -C 5 alkoxy, hydroxy, halogen, acryloxy, and methacryloxy, and a and b are each integers from 0 to 2.

Claim 10

The photochromic article of claim 7 wherein R 1 is hydrogen or methyl; R 2 is hydrogen or the group, --C(O)W, W being --OR 4 , wherein R 4 is C 1 -C 3 alkyl or allyl; and R 3 is hydrogen, C 1 -C 3 alkyl, phenyl(C 1 -C 3 )alkyl, or the group, --C(O)X wherein X is a C 1 -C 4 alkyl.

Claim 11

The photochromic article of claim 8 wherein Y 1 is C 1 -C 3 alkyl, C 1 -C 3 alkoxy, or fluoro, Z 1 is a hydrogen, each Y 2 and Z 2 is selected from the group consisting of C 1 -C 3 alkyl and C 1 -C 3 alkoxy, a is the integer 0 or 1, and b is an integer from 0 to 2.

Claim 12

The photochromic article of claim 9 wherein the organic host material is a solid transparent homopolymer or copolymer of diethylene glycol bis(allyl carbonate), poly(4,4'dioxydiphenol-2,2-propane) carbonate, poly(methyl-methacrylate), polyvinylbutyral or a polyurethane.

Claim 13

The photochromic article of claim 10 wherein the photochromic compound is present in an amount of from about 0.15 to 0.35 milligrams per square centimeter of organic host material surface to which the photochromic compound is incorporated or applied.

Claim 14

The photochromic article of claim 11 wherein the article is a lens.

Claim 15

A photochromic article comprising a solid transparent polymerized organic host material and a photochromic amount of each of (a) a first photochromic substance selected from the group consisting of spiro(indoline) naphthoxazines, spiro(indoline) pyridobenzoxazines, spiro(indoline) benzoxazines, and benzopyrans or naphthopyrans other than the photochromic substance of (b) having a nitrogen-containing substituent on the carbon atom adjacent to the oxygen of the pyran ring, and (b) a second photochromic substance selected from naphthopyran compounds represented by the following graphic formula: ##STR14## wherein: (a) R 1 is hydrogen or a C 1 -C 6 alkyl; R 2 is hydrogen or the group, --C(O)W, W being --OR 4 or --N(R 5 )R 6 , wherein R 4 is hydrogen, allyl, C 1 -C 6 alkyl, phenyl, C 1 -C 6 monoalkyl substituted phenyl, C 1 -C 6 monoalkoxy substituted phenyl, phenyl(C 1 -C 3 )alkyl, C 1 -C 6 monoalkyl substituted phenyl(C 1 -C 3 )alkyl, C 1 -C 6 monoalkoxy substituted phenyl(C 1 -C 3 )alkyl, C 1 -C 6 alkoxy(C 2 -C 4 )alkyl, or C 1 -C 6 monohaloalkyl, and wherein R 5 and R 6 are each selected from the group consisting of hydrogen, C 1 -C 6 alkyl, C 5 -C 7 cycloalkyl, phenyl and mono- or di-substituted phenyl, or R 5 and R 6 together with the nitrogen form a mono- or di-substituted or unsubstituted heterocyclic ring selected from the group consisting of indolinyl, morpholino, piperidino, 1-pyrrolidyl, 1-pyrrolinyl, 1-imidazolidyl, 2-imidazolin-1-yl, 2-pyrazolidyl and 1-piperazinyl, said phenyl and heterocyclic ring substituents being selected from C 1 -C 6 alkyl and C 1 -C 6 alkoxy and said halo substituent being chloro or fluoro; R 3 is hydrogen, C 1 -C 6 alkyl, phenyl(C 1 -C 3 )alkyl, C 1 -C 6 monoalkyl substituted phenyl(C 1 -C 3 )alkyl, C 1 -C 6 monoalkoxy substituted phenyl(C 1 -C 3 )alkyl, C 1 -C 6 alkoxy(C 2 -C 4 )alkyl, C 5 -C 7 cycloalkyl, C 1 -C 4 monoalkyl substituted C 5 -C 7 cycloalkyl, C 1 -C 6 monohaloalkyl, allyl or the group, --C(O)X, wherein X is a C 1 -C 6 alkyl, phenyl, C 1 -C 6 mono-or C 1 -C 6 di-alkyl substituted phenyl, C 1 -C 6 mono- or C 1 -C 6 di-alkoxy substituted phenyl, C 1 -C 6 alkoxy, phenoxy, C 1 -C 6 mono- or C 1 -C 6 di-alkyl substituted phenoxy, C 1 -C 6 mono- or C 1 -C 6 di-alkoxy substituted phenoxy, C 1 -C 6 alkylamino, phenylamino, C 1 -C 6 mono- or C 1 -C 6 di-alkyl substituted phenylamino, or C 1 -C 6 mono- or C 1 -C 6 di-alkoxy substituted phenylamino and said halo substituent being chloro, fluoro or bromo, provided that one of R 1 or R 2 is hydrogen; (b) B is selected from the group consisting of the substituted or unsubstituted aryl groups phenyl and naphthyl, and (c) B' is selected from the group consisting of the substituted or unsubstituted heterocyclic aromatic groups pyridyl, furyl, benzofuryl, thienyl, and benzothienyl, said aryl and heterocyclic substituents being selected from the group consisting of hydroxy, C 1 -C 5 alkyl, C 1 -C 5 haloalkyl, C 1 -C 5 alkoxy, C 1 -C 5 alkoxy(C 1 -C 4 )alkyl, C 1 -C 5 dialkylamino, acryloxy, methacryloxy, and halogen, said halogen or (halo) groups being fluoro, chloro, or bromo.

Claim 16

A photochromic article comprising a solid transparent polymerized organic host material and a photochromic amount of each of (a) a first photochromic substance selected from the group consisting of spiro(indoline) naphthoxazines, spiro(indoline) pyridobenzoxazines, spiro(indoline) benzoxazines, and benzopyrans or naphthopyrans other than the photochromic substance of (b) having a nitrogen-containing substituent on the carbon atom adjacent to the oxygen of the pyran ring, and (b) a second photochromic substance selected from naphthopyran compounds represented by the following graphic formula: ##STR14## wherein: (a) R 1 is hydrogen or a C 1 -C 6 alkyl; R 2 is hydrogen or the group, --C(O)W, W being --OR 4 or --N(R 5 )R 6 , wherein R 4 is hydrogen, allyl, C 1 -C 6 alkyl, phenyl, C 1 -C 6 monoalkyl substituted phenyl, C 1 -C 6 monoalkoxy substituted phenyl, phenyl(C 1 -C 3 )alkyl, C 1 -C 6 monoalkyl substituted phenyl(C 1 -C 3 )alkyl, C 1 -C 6 monoalkoxy substituted phenyl(C 1 -C 3 )alkyl, C 1 -C 6 alkoxy(C 2 -C 4 )alkyl, or C 1 -C 6 monohaloalkyl, and wherein R 5 and R 6 are each selected from the group consisting of hydrogen, C 1 -C 6 alkyl, C 5 -C 7 cycloalkyl, phenyl and mono- or di-substituted phenyl, or R 5 and R 6 together with the nitrogen form a mono- or di-substituted or unsubstituted heterocyclic ring selected from the group consisting of indolinyl, morpholino, piperidino, 1-pyrrolidyl, 1-pyrrolinyl, 1-imidazolidyl, 2-imidazolin-1-yl, 2-pyrazolidyl and 1-piperazinyl, said phenyl and heterocyclic ring substituents being selected from C 1 -C 6 alkyl and C 1 -C 6 alkoxy and said halo substituent being chloro or fluoro; R 3 is hydrogen, C 1 -C 6 alkyl, phenyl(C 1 -C 3 )alkyl, C 1 -C 6 monoalkyl substituted phenyl(C 1 -C 3 )alkyl, C 1 -C 6 monoalkoxy substituted phenyl(C 1 -C 3 )alkyl, C 1 -C 6 alkoxy(C 2 -C 4 )alkyl, C 5 -C 7 cycloalkyl, C 1 -C 4 monoalkyl substituted C 5 -C 7 cycloalkyl, C 1 -C 6 monohaloalkyl, allyl or the group, --C(O)X, wherein X is a C 1 -C 6 alkyl, phenyl, C 1 -C 6 mono-or C 1 -C 6 di-alkyl substituted phenyl, C 1 -C 6 mono- or C 1 -C 6 di-alkoxy substituted phenyl, C 1 -C 6 alkoxy, phenoxy, C 1 -C 6 mono- or C 1 -C 6 di-alkyl substituted phenoxy, C 1 -C 6 mono- or C 1 -C 6 di-alkoxy substituted phenoxy, C 1 -C 6 alkylamino, phenylamino, C 1 -C 6 mono- or C 1 -C 6 di-alkyl substituted phenylamino, or C 1 -C 6 mono- or C 1 -C 6 di-alkoxy substituted phenylamino and said halo substituent being chloro, fluoro or bromo, provided that one of R 1 or R 2 is hydrogen; (b) B is selected from the group consisting of the substituted or unsubstituted aryl groups phenyl and naphthyl, and (c) B' is selected from the group consisting of the substituted or unsubstituted heterocyclic aromatic groups pyridyl, furyl, benzofuryl, thienyl, and benzothienyl, said aryl and heterocyclic substituents being selected from the group consisting of hydroxy, C 1 -C 5 alkyl, C 1 -C 5 haloalkyl, C 1 -C 5 alkoxy, C 1 -C 5 alkoxy(C 1 -C 4 )alkyl, C 1 -C 5 dialkylamino, acryloxy, methacryloxy, and halogen, said halogen or (halo) groups being fluoro, chloro, or bromo.

Claim 17

The photochromic article of claim 13 wherein the organic host material is selected from the group consisting of polyacrylates, cellulose acetate, cellulose triacetate, cellulose acetate propionate, cellulose acetate butyrate, poly(vinyl acetate), poly(vinyl alcohol), poly(vinyl chloride), poly(vinylidene chloride), polycarbonate, polyurethanes, poly(ethylene terephthalate), polystyrene, copoly(styrene-methylmethacrylate), copoly(styrene-acrylonitrile, polyvinylbutyral and polymers of members of the group consisting of polyol(allyl carbonate) monomers, polyfunctional acrylate monomers, and diallylidene pentaerythritol monomers.

Claim 18

The photochromic article of claim 14 wherein B is a phenyl group; represented respectively by the following graphic formulae: ##STR15## wherein, Y 1 is selected from the group consisting of C 1 -C 5 alkyl, C 1 -C 5 alkoxy, fluoro, and chloro, Z 1 is selected from the group consisting of hydrogen and Y 1 , each Y 2 and Z 2 are selected from the group consisting of C 1 -C 5 alkyl, C 1 -C 5 alkoxy, hydroxy, halogen, acryloxy, and methacryloxy, and a and b are each integers of from 0 to 2.

Claim 19

The photochromic article of claim 15 wherein R 1 is hydrogen or methyl; R 2 is hydrogen or the group, --C(O)W, W being --OR 4 , wherein R 4 is C 1 -C 3 alkyl or allyl; and R 3 is hydrogen, C 1 -C 3 alkyl, phenyl(C 1 -C 3 )alkyl, or the group, --C(O)X wherein X is a C 1 -C 4 alkyl.

Claim 20

The photochromic article of claim 16 wherein Y 1 is C 1 -C 3 alkyl, C 1 -C 3 alkoxy, or fluoro, Z 1 is a hydrogen, each Y 2 and Z 2 is selected from the group consisting of C 1 -C 3 alkyl and C 1 -C 3 alkoxy, a is the integer 0 or 1, and b is an integer from 0 to 2.

Claim 21

The photochromic article of claim 17 wherein the organic host material is a solid transparent homopolymer or copolymer of diethylene glycol bis(allyl carbonate), poly(4,4'dioxydiphenol-2,2-propane) carbonate, poly(methylmethacrylate), polyvinylbutyral or a polyurethane.

Claim 22

The photochromic article of claim 18 wherein the photochromic compound is present in an amount of from about 0.15 to 0.35 milligrams per square centimeter of organic host material surface to which the photochromic compound is incorporated or applied.

Claim 23

The photochromic article of claim 19 wherein the weight ratios of the first photochromic substance to the second photochromic substance is from about 1:3 to about 3:1.

Claim 24

The photochromic article of claim 20 wherein the article is an ophthalmic lens.