Relationship between Surface Character of Copper Phthalocyanine Blue Pigment Particle and Surface Potential -Surface Potential in Acrylic Resin Solusion-

Abstract

In our previous study, we found that the adsorption of polar solvents or mono-mers on the pigment surface caused the surface potential, and the magnitude of the surface potential was well related to the dispersion stability in solvents and/or acrylic monomers. In this paper, the surface potential and resin adsorption on the surface of copper phthalocyanine pigments having three different surface characters were investigated in acrylic resin solution. The copper phthalocyanine pigment samples having three differrent surface ch aracters were prepared by surface treatment using amino derivative and sulfonated derivative of copper phthalocyanine compound. Acrylic resins were prepared by copolymerization of buthyl methacrylate and methacrylic acid. Resin adsorption caused the occurrence of surface potential, however, the value of surface potential was not proportional to the adsorption volume. Resin adsorption was more effective against dispersion stability rather than surface potential in the resin solution. Relationships between surface potential and res in adsorption were quite different in each surface character of the surface treated samples.