RELATIONSHIP BETWEEN SURFACE CHARACTER OF COPPER PHTHALOCYANINE BLUE PIGMENT PARTICLE AND SURFACE-POTENTIAL - SURFACE-POTENTIAL IN SOLVENTSAND OR ACRYLIC-MONOMERS/

Study of suspension stability related to the surface potential of pigm ent particle in nonaqueous system has been scarcely done due to the co mplicated ionization phenomena. However, the surface potential of disp ersed particles is very important for the study of dispersion stabilit y. Surface potential of three different copper phthalocyanine pigments was measured in solvents and/or acrylic monomers. The copper phthaloc yanine pigment samples having three different surface characters were prepared by surface treatment using amino derivative and sulfonated de rivative of copper phthalocyanine compound. Dispersion stability was o btained in the system where surface potential was recognized,and the s urface potential was deeply related with the polarization and the diss ociation of the polar solvents and/or monomers adsorbed on the surface of pigment particles. The permittivity of the system was measured to estimate the polarization and the dissociation of the polar solvents a nd/or monomers. The interaction between the surface of pigment particl e and the polar solvents and monomer molecules was quite different in each pigment's surface.