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US 6,350,307 B1Granted
Metal complex pigments
AssigneeBayer Aktiengesellschaft
InventorsFrank Linke, Kent Faubion, Udo Herrmann, Richard Sommer
Life of this patent
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Abstract
Metal complexes of an azo compound which conforms to the formula (I) or one of its tautomeric structures wherein R and R′ are independently OH, NH2, NH—CN, acylamino or arylamino, R1 and R1′ are independently —OH or —NH2, and which contain at least one guest compound, characterized in that the metal complexes correspond to the mono-, di-, tri- and tetrainions of the azo compounds of the formula (I) with the metals selected from the group consisting of Ca, Zn, Cu, Fe, Co, Sr, Ba, Cr, Sn, Al, Mg, Cd, Pb and La.
Claims13
A metal complex pigment comprising
- (a) a metal complex of
- (1) a monoanion, dianion, trianion, or tetraanion of an azo compound conforming to formula (II)
- or a tautomeric form thereof,
- wherein
- R is OH or NH—CN, and
- R′ is NH—CN, and
- (2) the metal La;
- and
- (b) at least one guest compound.
6 more elements
Dependencies are inferred from the claim text.