SUPERFICIALLY MODIFIED PIGMENT COMPOSITIONS AND PROCESS TO IMPROVE THE RHEOLOGICAL AND STABILITY CHARACTERISTICS OF A MODIFIED PIGMENT DISPERSION.

摘要

Surface modification of a variety of pigments, particularly quinacridone pigments, and the pigments resulting therefrom whereby the pigment is treated with a poly(vinyl lower alkyl ether) and, optionally, with a dispersion-improving derivative of the primary pigment resulting in compositions exhibiting enhanced performance in automotive and other finish systems. The surface treatment also improves flow properties of the pigment in the aqueous phase of processing leading to higher solids content for direct application in waterborne systems.