Patent ID: 8075638

Claim:
A dye of formula (I): A-(L) p -C sat —S—Y-(L′) p′ -Y—S—C sat -(L) p -A (I) the organic or mineral acid salts, optical isomers and geometric isomers thereof, and the solvates such as hydrates: in which formula (I): A represents a radical containing at least one chromophore which is optionally cationic, colored, or colored and fluorescent; L and L′, which may be identical or different, represent: a saturated or unsaturated, linear or branched C 1 -C 20 hydrocarbon-based chain which is optionally substituted, optionally interrupted and/or optionally terminated at one or both of its ends with one or more divalent groups or combinations thereof chosen from —N(R)—, —O—, —S—, —C(O)— and —SO 2 —, with R, R′, which may be identical or different, being chosen from a hydrogen, and a C 1 -C 4 alkyl, hydroxyalkyl and aminoalkyl radical; it being understood that said combination cannot form a disulfide bond —S—S—; an arylene group, a heteroarylene group, a cycloalkylene group, or a heterocycloalkylene group; Y represents a carbonyl group or a heteroaryl group, which is cationic or noncationic, which comprises 5-13 members, which is optionally substituted, and which comprises from 1 to 5 heteroatoms chosen from oxygen, sulfur, or nitrogen atoms; p and p′, which may be identical or different, represent an integer equal to 0 or 1; and C sat represents an optionally substituted, linear or branched C 1 -C 18 alkylene chain.