US 5,180,524 AGranted

Photochromatic composition and photochromatic articles which contain it

AssigneeEnichem Synthesis S.p.A.

InventorsNicola Casilli, Luciana Crisci, Fiorenzo Renzi, Franco Rivetti

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Abstract

A photochromatic composition contains at least two photochromatic compounds, defined by the general formula: ##STR1## wherein the various substituents from R.sub.1 to R.sub.7 and X are as defined in the specification. In such a mixture, at least one photochromatic compound is defined by the general formula, wherein R.sub.7 represents a hydrogen atom, and at least one further compound is also defined by the general formula, wherein R.sub.7 represents an -NR.sub.8 R.sub.9, with R.sub.8 and R.sub.9 having the meaning as defined in the text.

Claims13

Dependent claims

A photochromatic composition comprising two photochromatic compounds selected from the group consisting of compounds of the formula:

##STR14## wherein:
R.sub.1 and R.sub.2 are independently selected from the group consisting of hydrogen, halogen, C.sub.1 -C.sub.5 -alkoxy, nitro, cyano, linear and branched C.sub.1 -C.sub.5 -alkyl that are optionally substituted with a substituent selected from the group consisting of halogen, C.sub.1 -C.sub.5 -alkoxy, C.sub.1 -C.sub.5 -alkyl-thio, C.sub.1 -C.sub.5 -alkyl-carboxy, and cyano;
R.sub.3 and R.sub.4 are independently selected from the group consisting of linear and branched C.sub.1 -C.sub.5 alkyl, phenyl and benzyl, and optionally R.sub.3 and R.sub.4 form a C.sub.5 -C.sub.8 -cycloalkyl group with the carbon atom to which they are commonly linked;
R.sub.5 is independently selected from the group consisting of C.sub.1 -C.sub.5 linear and branched alkyl that are optionally substituted with a substituent selected from the group consisting of halogen, C.sub.1 -C.sub.5 -alkoxy, C.sub.1 -C.sub.5 -alkyl-thio, C.sub.1 -C.sub.5 -carboxy-alkyl and cyano group, phenyl, benzyl and allyl;
R.sub.6 is independently selected from the group consisting of hydrogen, halogen, C.sub.1 -C.sub.5 -alkoxy, C.sub.1 -C.sub.5 -alkyl-thio, C.sub.1 -C.sub.5 -carboxy-alkyl, cyano, linear and branched C.sub.1 -C.sub.5 alkyl that are optionally substituted with a substituent selected from the group consisting of halogen, C.sub.1 -C.sub.5 -alkoxy, C.sub.1 -C.sub.5 -alkyl-thio, C.sub.1 -C.sub.5 -carboxy-alkyl and cyano;
R.sub.7 represents a hydrogen atom or ##STR15## wherein R.sub.8 and R.sub.9 form a monocyclic or polycyclic structure having from 5 to 12 members with the nitrogen atom to which they are commonly linked, said cyclic structure optionally containing an additional heteroatom selected from the group consisting of oxygen and nitrogen;
and
X represents a --CH-- group or N;
wherein at least one of said photochromatic compounds defined by formula (I) in said photochromatic composition has an R.sub.7 substituent which is hydrogen and at least one of said photochromatic compounds defined by formula (I) has an R.sub.7 substituent wherein R.sub.8 and R.sub.9 in the group ##STR16## are as defined herein above.

6 more elements

Dependencies are inferred from the claim text.

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Abstract

A photochromatic composition comprising two photochromatic compounds selected from the group consisting of compounds of the formula:

##STR14## wherein:
R.sub.1 and R.sub.2 are independently selected from the group consisting of hydrogen, halogen, C.sub.1 -C.sub.5 -alkoxy, nitro, cyano, linear and branched C.sub.1 -C.sub.5 -alkyl that are optionally substituted with a substituent selected from the group consisting of halogen, C.sub.1 -C.sub.5 -alkoxy, C.sub.1 -C.sub.5 -alkyl-thio, C.sub.1 -C.sub.5 -alkyl-carboxy, and cyano;
R.sub.3 and R.sub.4 are independently selected from the group consisting of linear and branched C.sub.1 -C.sub.5 alkyl, phenyl and benzyl, and optionally R.sub.3 and R.sub.4 form a C.sub.5 -C.sub.8 -cycloalkyl group with the carbon atom to which they are commonly linked;
R.sub.5 is independently selected from the group consisting of C.sub.1 -C.sub.5 linear and branched alkyl that are optionally substituted with a substituent selected from the group consisting of halogen, C.sub.1 -C.sub.5 -alkoxy, C.sub.1 -C.sub.5 -alkyl-thio, C.sub.1 -C.sub.5 -carboxy-alkyl and cyano group, phenyl, benzyl and allyl;
R.sub.6 is independently selected from the group consisting of hydrogen, halogen, C.sub.1 -C.sub.5 -alkoxy, C.sub.1 -C.sub.5 -alkyl-thio, C.sub.1 -C.sub.5 -carboxy-alkyl, cyano, linear and branched C.sub.1 -C.sub.5 alkyl that are optionally substituted with a substituent selected from the group consisting of halogen, C.sub.1 -C.sub.5 -alkoxy, C.sub.1 -C.sub.5 -alkyl-thio, C.sub.1 -C.sub.5 -carboxy-alkyl and cyano;
R.sub.7 represents a hydrogen atom or ##STR15## wherein R.sub.8 and R.sub.9 form a monocyclic or polycyclic structure having from 5 to 12 members with the nitrogen atom to which they are commonly linked, said cyclic structure optionally containing an additional heteroatom selected from the group consisting of oxygen and nitrogen;
and
X represents a --CH-- group or N;
wherein at least one of said photochromatic compounds defined by formula (I) in said photochromatic composition has an R.sub.7 substituent which is hydrogen and at least one of said photochromatic compounds defined by formula (I) has an R.sub.7 substituent wherein R.sub.8 and R.sub.9 in the group ##STR16## are as defined herein above.

6 more elements