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US 10,017,644 B2Granted
Metal azo pigments
AssigneeLANXESS Deutschland GmbH
InventorsSabine Endert, Hans-Ulrich Borst, Frank Linke
Life of this patent
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Abstract
The novel yellow metal azo pigments based on at least three metal azo compounds, which differ at least in the type of metal, have improved color strengths and are of excellent suitability for pigmentation of pigment preparations for a broad field of use.
Claims18
A metal azo pigment comprising:
- a) three or more metal azo compounds which differ at least in the type of metal and which each contain
- structural units of the formula (I), or the tautomeric forms thereof,
- 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
- Ni2+ and Zn2+ ions, and at least one further metal ion Me, where
- Me is a di- or trivalent metal ion selected from the group of Cu2+, Al3+, Fe2+, Fe3+, Co2+ and Co3+,
- with the proviso that the amount of Zn2+ and Ni2+ ions together is 70 mol % to less than 95 mol % and the amount of metal ions Me is greater than 5 mol % to 30 mol % based in each case on one mole of all metal ions in the metal azo pigment, and
- the molar ratio of Zn2+ to Ni2+ ions in the metal azo pigment is 92:5 to 5:92, and
- b) one or more compounds of the formula (II)
- in which R6 is hydrogen or alkyl.
9 more elements
Dependencies are inferred from the claim text.