Basf Se Corporation

Sonja Gesine Gabriel

Frank O Pirrung

Steffen Onclin

Matthias Maier

The present invention relates to a dispersant composition comprising: a) at least one oligomeric acid A, which has i) at least one acidic group selected from COOH and POH, and ii) at least one polyoxyalkylene-ether radical of the formula (I): R&#x2014;(O-A)O-G-, where A is an C-C-alkan-1,2-diyl radical; X is an integer having a number average value in the range from 2 to 20; and R is hydrocarbon radical having from 1 to 30 carbon atoms; G is a chemical bond or a carbonyl group; and b) at least one polyamine B, which is selected from the group consisting of polyvinylamines, poly-C-C-alkyleneimines, modified poly-C-C-alkyleneimines, melamine compounds, modified melamine compounds, poly-(C-C-alkyleneether) amines, polyetheramine polyols, and modified polyetheramine polyols. The invention also relates to aqueous pigment compositions containing a dispersant composition as defined herein, a pigment component, selected from the group consisting of pigments and mixtures of at least one pigment and at least one filler, and an aqueous diluent.

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Ludwigshafen, Germany

Sonja Gesine Gabriel