Illuminometers containing photochromatic substances

Claim 2

Illuminometer according to the preceding claim, in which the photochromatic substances are selected from those falling within the scope of the following general formula (I): in which R₁ and R₂    independently represent a hydrogen atom or a halogen atom (fluorine, chlorine or bromine), or a radical selected from among: linear or branched (C₁₋C₅)-alkyl, (C₁-C₅)-alkoxy, nitro or cyano; R₃ and R₄    independently represent linear or branched (C₁-C₅)-alkyl groups, phenyl or benzyl; or R₃ and R₄, considered together, and jointly with the carbon atom they are linked to, form a (C₅-C₈)-cycloalkyl group; R₅    represents a linear or branched (C₁-C₅)-alkyl group, phenyl, benzyl or allyl; R₆    represents a hydrogen atom or a linear or branched (C₁-C₅)-alkyl group, or the group -NR₈R₉, in which R₈ is a linear or branched (C₁-C₅)-alkyl group, phenyl or benzyl; R₉ is hydrogen, or has the same meaning as of R₈, or R₈ and R₉, considered together, and jointly with the nitrogen atom they are linked to, form a cyclic structure of from 5 to 12 members, optionally containing a futher heteroatom selected from the group consisting of oxygen and nitrogen; R₇    represents a hydrogen atom or a halogen atom (fluorine, chlorine or bromine), or a radical selected from among: linear or branched (C₁ - C₅)-alkyl, (C₁-C₅)-alkoxy, cyano, mercapto, carboxylate ester with 1-3 carbon atoms in the ester moiety, or R₇ represents a fused aromatic or heterocyclic ring; and X    represents either =CH- or =N-.

Claim 3

Illuminometer according to the preceding claim, in which the photochromatic substances are selected in particular from among the following: 1,3,3,5,6-pentamethyl-spiro-{indolino-2,3'-[3H]-naphtho-(2,1-b)-(1,4)-oxazine}; 1,3,3-trimethyl-spiro-{indolino-2,3'-[3H]-naphtho-(2,1-b)-(1,4)-oxazine}; 1,3,3-trimethyl-spiro-{indolino-6'-(1-piperidyl)-2,3'-[3H]-naphtho-(2,1-b)-(1,4)-oxazine}; 1,3,3-trimethyl-spiro-{indolino-6'-(1-morpholyl)-2,3'-[3H]-naphtho-(2,1-b)-(1,4)-oxazine}; 1,3,3,4,5- or 1,3,3,5,6-pentamethyl-spiro-{indolino-6'-(1-piperidyl)-2,3'-[3H]-naphtho-(2,1-b)-(1,4)-oxazine}; and 1,3,3-trimethyl-spiro-[indolino-6'-(1-piperidyl)-9'-methoxy]-2,3'-[3H]-naphtho-(2,1-b)-(1,4)-oxazine.

Claim 4

Illuminometer according to claim 1 or 2, in which the polymeric material is an organic polymer selected from the group consisting: - polypropylene and polyethylene; - rigid or plastified poly(vinyl chloride); - cellulose esters: acetate, acetate-butyrate, etc.; - polystyrene; - ethylene-vinyl acetate; - poly(methyl methacrylate); - polymer of diethyleneglycol-bis(allyl carbonate) (also known as "RAV 7"); - polycarbonate; - polyurethane.