PURPOSE: To obtain the titled pigment having improved color tone, light resistance, stability, nontoxicity and dispersibility, by grinding silica particles in the presence of goethite particles so that the goethite particles are attached to the ground surface and a goethite particle layer is formed on the surface of the silica particles.
CONSTITUTION: (A) Silica particles or a bulky material thereof is ground in the presence of goethite, the goethite particles are attached to the ground surface and a goethite particle layer is formed on the surface of the silica particles or (B) the silica particles are blended with the goethite particles, dispersed and heated in an alkali aqueous solution, a goethite particle layer is formed on the surface of the silica particles to give the aimed pigment having the silica particles as nucleus and the goethite particle layer formed on the surface of the nucleus. Preferably the silica particles have 1W18μ average particle diameter and the goethite particles have ≤0.2μ average particle diameter.
BANDO YASUO
NOBUOKA SOICHIRO
