Near infrared antihalation dyes

Claim 1

A compound having a nucleus of the general formula, ##STR11## wherein: M.sup.⊕ is a cation, X represents the non-metallic atoms necessary to complete a 5-, 6- or 7- membered carbocyclic ring, a 5-, 6- or 7- membered heterocyclic ring or a fused ring system on a 5-, 6- or 7- membered nucleus and comprising up to 14 total ring atoms selected from C, N, O, S and Se, and each R 1 represents: an alkyl group of 1 to 5 carbon atoms, optionally substituted with one or more substituents which are members selected from the group consisting of halogen atoms, hydroxy moieties, alkoxy groups of 1 to 5 carbon atoms, cyano moieties, carboxyl moieties, alkoxy carbonyl groups of 1 to 5 carbon atoms, sulphonic acid moieties and aryl groups of up to 10 carbon atoms, wherein the aryl groups may be optionally substituted with one or more substituents which are members selected from the group consisting of alkyl groups of 1 to 5 carbon atoms, halogen atoms, hydroxy moieties, alkoxy groups of 1 to 5 carbon atoms, cyano moieties, carboxyl moieties, alkoxy carbonyl groups of 1 to 5 carbon atoms and sulphonic acid moieties; or R 1 may represent an aryl group of up to 10 carbon atoms, optionally substituted with one or more substituents which are members selected from the group consisting of an alkyl group of 1 to 5 carbon atoms, halogen moieties, alkoxy groups of 1 to 5 carbon atoms, cyano moieties, carboxyl moieties, alkoxy carbonyl groups of 1 to 5 carbon atoms and sulphonic acid moieties, and each R 2 represents: an alkyl groups of 1 to 5 carbon atoms, optionally substituted with one or more substituents which are members selected from the group consisting of halogen atoms, hydroxy moieties, alkoxy groups of 1 to 5 carbon atoms, cyano moieties, carboxyl moieties, alkoxy carbonyl groups of 1 to 5 carbon atoms, sulphonic acid moieties and aryl groups of up to 10 carbon atoms, wherein the aryl group may be optionally substituted with one or more substituents which are members selected from the group consisting of alkyl groups 1 to 5 carbon atoms, halogen atoms, hydroxy moieties, alkoxy groups of 1 to 5 carbon atoms, cyano moieties, carboxyl moieties, alkoxy carbonyl groups of 1 to 5 carbon atoms and sulphonic acid moieties; an aryl group of up to 10 carbon atoms, optionally substituted with one or more substituents which are members selected from the group consisting of an alkyl group of 1 to 5 carbon atoms, halogen atoms, hydroxy moieties, alkoxy groups of 1 to 5 carbon atoms, cyano moieties, carboxyl moieties, alkoxy carbonyl groups of 1 to 50 carbon atoms and sulphonic acid moieties; --CO 2 H; --CO 2 M.sup.⊕ (wherein M.sup.⊕ is defined previously); or CO 2 R 12 , wherein R 12 is an alkyl group of 1 to 5 carbon atoms, optionally substituted with one or more substituents which are members selected from the group consisting of halogen atoms, hydroxy moieties, alkoxy groups of 1 to 5 carbon atoms and cyano moieties.