Asahipen Corporation

Tadamitsu Hirata

Yoshihiko Nishimura

To produce colored particles with a 10-200 .mu.m average grain size simply, efficiently, and in high yields, in order to obtain suede-type paint constituents with excellent decorative features capable of producing finely detailed, marble-like, multi-color patterns. Water-insoluble particles and a polyvalent carboxylic acid resin with an acid value (solid-based) of about 20-120, either water-soluble or water-diffusing, are mixed in water; and after primary coated particles are formed on the surfaces of the water-insoluble particles on which the polyvalent carboxylic acid resin is adsorbed, a dispersion-stabilized emulsion resin containing a colored pigment is mixed in the dispersion liquid; and a metal salt is added to this mixture so that colored particles with an average particle size of about 10-200 .mu.m with a surface colored coating are obtained. The water-insoluble particles can be either synthetic resin particles or inorganic particles.

Method for manufacture of colored particles

A dispersion of a colored high-molecular weight particulate material is prepared by a) mixing a pigment with an aqueous emulsion of a resin to form a dispersion of the pigment within the emulsion; b) combining the dispersion with particles of polyvinyl chloride containing a plasticizer to form a mixture; and c) adding a metal salt to the mixture to cause the resin to coagulate onto the particles of the polyvinyl chloride. A film comprising the resin and the pigment is formed on the particles of the polyvinyl chloride.

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Hirakata, Japan

Tadamitsu Hirata