Patent ID: 7988741

Claim:
A cationic naphthalimide dye corresponding to the compounds of general formula (I) and to the dimers of the compounds (I) corresponding to the following general formulae (II), (III) and (IV): in which formulae (I) to (IV): the radicals R 1 , taken separately and independently of one another, represent a hydrogen atom; an optionally substituted C 1 -C 4 alkyl radical, the radicals R, taken separately and independently of one another, represent a hydrogen atom; an aryl or arylalkyl radical, in which the aryl part is optionally substituted; an optionally substituted C 1 -C 8 , alkyl radical that is optionally interrupted with one or more heteroatoms chosen from oxygen, nitrogen and sulphur, and that may be substituted with at least one group corresponding to the following formulae (a) and (b): wherein the radical R 2 represents an optionally substituted C 1 -C 6 alkyl radical, the radical R 3 represents a halogen atom, an optionally substituted C 1 -C 6 alkyl radical, a C 1 -C 4 monohydroxyalkyl radical, a C 1 -C 4 alkoxyl radical, a hydroxycarbonyl radical, a (C 1 -C 6 )alkylthio radical, or an amino radical disubstituted with a (C 1 -C 4 ) alkyl radical, z is an integer between 0 and 3 inclusive, z′ is an integer between 0 and 2 inclusive, L is a cationic or non-cationic linker arm; X − represents a counterion for ensuring the electroneutrality of the compounds of formulae (I) to (IV); and to their addition salts with an acid and their solvates.