BISMETHINIC PIGMENTS

The present invention relates to a new class of "bismethinic" pigments having the following formula: (I) wherein: A represents a phenyl, diphenyl, naphthilic or anthracenic group, that may be substituted with groups selected from halogens, alkyl groups having from 1 to 4 carbon atoms and alkoxyl groups having from 1 to 4 atoms; B represents a phenyl, a naphthyl, anthraquinone or heterocyclic group such as benzothiazol, pyrazol, pyridine, isoindazol, benzimidazolone, that may be substituted with groups selected from hydroxyl, halogens, alkyl groups having from 1 to 4 carbon atoms, alkoxyl groups having from 1 to 4 carbon atoms, carboxylic, carbamoylic, benzamidic, acylaminic, benzoylaminic, dialkylaminic groups having from 1 to 4 carbon atoms in the alkyl radical, ureidic, thioureidic groups and arylazo groups, that may also be substituted in their aryl group with alkyl and/or alkoxyl groups having up to 4 carbon atoms and halogens. The invention also relates to the preparation of the pigments of formula (I) and their use.