Back to results
US 10,059,844 B2Granted
Metal azo pigments
AssigneeLANXESS Deutschland GmbH
InventorsFrank Linke, Hans-Ulrich Borst, Sabine Endert
Life of this patent
Estimating the term…
Abstract
The novel yellow metal azo pigments based on at least two metal azo compounds which differ at least in the type of metal have both improved dispersion properties and improved color strengths and are of excellent suitability for pigmentation of pigment preparations for a broad field of use.
Claims19
Metal azo pigments comprising:
- a) at least two 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, and
- R5 is hydrogen or alkyl, and
- metal ions comprising Zn2+ and/ Cu2+ metal ions, and optionally at least one further metal ion Me, where Me is a di- or trivalent metal ion other than Zn2+ and Cu2+,
- with the proviso that the amount of Zn2+ and Cu2+ metal ions together is 95 to 100 mol % and, if used, the amount of di- or trivalent metal ions other than Zn2+ and Cu2+ is 0 to 5 mol %, based in each case on one mole of all metal ions in the metal azo pigment, and
- where the molar ratio of Zn2+ to Cu2+ metal ions in the metal azo pigment is 199:1 to 1:15, and
- b) at least one compound of the formula (II)
- in which R6 is hydrogen or alkyl.
8 more elements
Dependencies are inferred from the claim text.