Kazufumi Yokogawa

Design and properties of reactive dyes with heterobifunctional reactive systems

Dyes with two different reactive groups have been investigated for establishing the molecular design concept of heterobifunctional reactive dyes. The β-sulphatoethylsulphonyl/monochlorotriazinyl combined reactive system on the same side of a chromogen offers great flexibility in molecular engineering techniques for the dyes, making it possible to achieve improved application properties. The bridge links between the two reactive groups and between the chromogen and the triazine play a vital role in optimizing the system. Thus, the heterobifunctional dyes with a 4-chloro-6-[3-(β-sulphatoethylsulphonyl)anilino]-1,3,5-triazin-2-ylamino group show the best overall picture with respect to application properties, permitting the conclusion that their distinct advantages over comparable mono- and homobifunctional dyes can be achieved by cooperative functions of these structural units.