Coated pigment
AssigneeToyo Aluminium Kabushiki Kaisha
InventorsFuta Hayashi, Masami Sato, Katsura Kawashima
Life of this patent
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Abstract
A main object of the present invention to provide a coated pigment that is composed of a composite particle comprising a silicon compound coated on the surface of a metal particle, and that can be dispersed with relatively few aggregates. The present invention relates to a coated pigment comprising a composite particle containing a metal particle and one or two or more coating layers on the surface of the metal particle, wherein (1) at least one of the coating layers is a silicon compound-containing layer, and (2) the proportion of aggregates formed by adhesion of at least four of the composite particles with each other is not more than 35% by number.
Claims10
A method for manufacturing a coated pigment,
- (1) the method comprising a step in which an organic silicon compound is hydrolyzed in a liquid mixture containing (a) a flake-shaped metal particle, (b) a silicon-containing raw material including at least one kind of the organic silicon compound and (c) a solvent to thereby form a silicon compound-containing layer on the surface of the metal particle, and
- (2) at least the step is performed under stirring with a stirring blade so that the stirring Reynolds number Re=(ρ×n×d2)/μ, in which ρ is the density (kg/m3) of the liquid mixture at 25° C., n is the stirring rotation (rps), d is the impeller span (blade diameter) (m), and μ is the viscosity of the liquid mixture at 25° C., is at least 10,000.
Dependencies are inferred from the claim text.