Verfahren zur Herstellung von metallhaltigen Disazofarbstoffen

摘要

1,130,348. Metal complex disazo dyes. FARBWERKE HOECHST A.G. 13 Dec., 1965 [12 Dec., 1964], No. 52797/65. Heading C4P. The invention comprises complex copper, cobalt or chromiumcompounds of disazo dyes which in free acid form have the general formula wherein D is a radical of a diazo component of the benzene or naphthalene series, X is OH or COOH linked ortho to the azo bridge, Z is a -SO 2 CH 2 CH 2 OSO 3 H or -SO 2 -CH=CH 2 group linked to residues'D and/or A, n is 1 or 2 and benzene ring A may be substituted. The complexes are prepared by preparing a monoazo dye; metallizing the dye with simultaneous dealkylation of ortho alkoxy groups if necessary the metallized dye then being coupled with a diazotized amine of the benzene series in weakly acid to weakly alkaline medium, e.g. at pH 4 to 9 at 10‹ to 40‹ C. 1 :1 Copper complexes and 1:1 or 2:1 cobalt and chromium complexes are obtained. The dyes give reddish blue to black shades on natural or regenerated cellulose by dyeing or printing.