Importance

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Abstract

A pigment dispersion of enhanced viscosity and heat stability characteristics for use in coating systems is provided. The pigment dispersions generally comprise a pigment carrier, a pigment of the type having a hydrophilic surface, and a surfactant functional as a dispersant in a relatively non polar matrix and which is present on the surface of the pigment in an effective amount. Pigment carriers include water-based carriers and organic solvent-based carriers. Finished coatings having improved viscosity and heat stability are also provided. The finished coatings comprise a coating base and the surfactant treated pigments. Such pigments include iron oxide pigments yellow iron oxide pigment, black iron oxide pigment, divalent ferrite pigments, zinc ferrite pigment, and magnesium ferrite pigment. Such surfactants include trimethylol propane, and trimethylol ethane.

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First Claim