Metal azo pigments

A process for producing the metal azo pigment according to Cam 1, the process comprising reacting at least one compound of the formula (III), or tautomers thereof,

• in which
• X is an alkali metal ion,
• R1 and R2 are each independently OH, NH2 or NHR5,
• R3 and R4 are each independently ═O or ═NR5, and
• R5 is hydrogen or alkyl,
• in the presence of at least one compound of the formula (II)
• in which R is hydrogen or alkyl,
• simultaneously or successively with 0.05 to 0.95 mol of at least one nickel salt per mole of compound of the formula (III) and 0.05 to 0.95 mol of at least one copper salt per mole of compound of the formula (III), where the total molar amount of copper salt and nickel salt is 100 mol %.

A metal azo pigment comprising adducts of:

• at least two different metal azo compounds of the formula (I) or tautomeric forms thereof, which differ at least in the metal ion Me,
• in which
• R1 and R2 are each independently OH, NH2 or NHR5,
• R3 and R4 are each independently ═O or ═NR5,
• R5 is hydrogen or alkyl, and
• Me is a di- or trivalent metal on selected from the group of Ni2+, Zn2+, Cu2+, Al3+2/3, Fe2+, Fe3+2/3, Co2+ and Co+2/3,
• with the proviso that:
• an amount of metal ions from the group of Cu2+ and Ni2+ is 95 to 100 mol % and the amount of metal ions selected from the group of Zn2+, Al3+2/3, Fe2+, Fe3+2/3, Co2+ and Co3+2/3 is 0 to 5 mol %, based in each case on one mole of all compounds of the formula (I), and
• the molar ratio of Cu2+ to Ni2+ metal ions in the sum total of the compounds of the formula (I) is 19:1 to 1:<5.25, and
• at least one compound of the formula (II)
• in which R is hydrogen or alkyl.