Preparation of Spherical Fine Particulate Pigments within Water-in-Oil Emulsions and Their Properties.

概要

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The control of the diameter and the shape of pigment during the process of preparation by using W/O emulsion has been attempted in order to increase dispersing and tinting abilities of the pigments. The pigment was prepared by reacting an acid dye with multinuclear aluminum said within the aqueous phase of a W/O emulsion which was prepared by using a nonionic surfactant. The diameter of the pigment was less than 0.5μm. The diameter of spherical particles could be controlled by varying the concentrations of surfactant within the W/O emulsions. Due to the presence of a surfactant on the surface of pigment, the prepared pigments exhibited excellent dispersing ability. An investigation of the formation mechanism of the spherical pigments revealed that the diameter of the pigment was related to the concentration of the pigment in the W/O emulsion as well as the diameter of water droplets in the W/O emulsion.
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