whereinR1 and R2 each independently from each other are a residue of an organic dyeY1 and Y2 each independently from each other are unsubstituted or substituted, straight-chain or branched, interrupted or uninterrupted -C1-C10alkylene- -C5-C10cycloalkylene- C5-C10arylene or-C5-C10arylene-(C1-C10alkylene)-Z1 and Z2 independently from each other are -C(O)- -C2-C12alkenylene- -(CH2CH2-O)1-5- -C1-C10alkylene(C5-C10arylene)- -C5-C10arylene- -C5-C10cycloalkylene- -C(O)O--CON(R4)- -(R5)NC(O)- -O- -S- -S(O)- or-S(O)2-R3, R4 and R5 are each independently from each other hydrogen or unsubstituted or substituted, straight-chain or branched, monocyclic or polycyclic, interrupted or uninterrupted C1-C14alkyl C2-C14alkenyl C6-C10aryl C6-C10aryl-C1-C10alkyl or C5-C10alkyl(C5-C10aryl)r, q and n independently from each other are 0 or 1,if n is 0,Z3 is hydrogen andif n is 1,Z3 is -S-with the proviso that the method does not comprise treating the fiber with an enzyme of the type of a protein disulfidisomerase (EC 5.3.4.1).Further, the present invention relates to novel disulfid compounds, compositions thereof, especially comprising other dyes, and to processes for their preparation.
