摘要:
ARE LINKED THROUGH A DIVALENT BRIDGE MEMBER Z, IN WHICH FORMULAE R1, R2 AND R3 EACH REPRESENTS A HYDROGEN ATOM OR PREFERABLY A LOW-MOLECULAR ALKYL GROUP, WHICH MAY BE LINKED WITH THE RESIDUE A1 OR A2 IN THE ORTHO-POSITION TO THE GROUP -NR1R3 OR -NR2R4 TO FORM A RING; R4 REPRESENTS A LOW-MOLECULAR ALKYLENE GROUP; A1 AND A2 EACH REPRESENTS A BENZENE OR NAPHTHALENE RESIDUE. THE DYESTUFFS ARE SUITABLE FOR DYEING AND PRINTING MATERIALS OF ANIMAL ORIGIN, POLYAMIDE FIBERS, POLYURETHANES AND OTHER SUCH MATERIALS. THE DYESTUFFS EXHIBIT EXCELLENT LIGHT AND WET FASTNESS.
(D2-N=N-A2-N(-R2)-R4)-
(D1-N=N-A1(-N(-R1)(-R3))- (II) OR
DISAZO OR POLYAZO DYESTUFFS, IN WHICH TWO OF THE SAME OR DIFFERENT AZO DYESTUFF RESDUES OF THE GENERAL FORMULA
IN WHICH ONE OF THE SYMBOLS Y RESPRESENTS A HYDROGEN ATOM AND THE OTHER SYMBOL Y REPRESENTS A SULPHONIC ACID GROUP Z REPESENTS AN ACYL GROUPING AND X REPRESENTS AN A-BROMACRYLIC GROUPING, AN AB,-DIBROMOPROPIONYL GROUPING, A MONO- OR DINITROCHLOROHBENZOYL OR A MONO- OR DINITROBENZENESULPHONYL GROUPING.