| 摘要 |
PURPOSE:To obtain a pigment having a gloss and excelling in dispersibility, heat resistance and chroma, by adding three specified aqueous solutions to an aqueous suspension of fine mica powder and thereby coating the surfaces of these powder particles with iron oxide hydrate and an alkaline earth metal hydrate. CONSTITUTION:Mica is used as a base of a flaky fine powder and suspended in water. To this suspension, an aqueous solution (C) containing nitrate ions, an aqueous solution (a) containing iron ions and alkaline earth metal ions and an aqueous solution (b) containing a basic substance are added at once or in an arbitrary order with the aqueous solution (a) added prior to the addition of the aqueous solution (b). The surface of the fine powder particles are coated with iron oxide hydrate and the alkaline earth metal hydrate by the above operation. The obtained solid product is washed, separated by filtration and dried to obtain the purpose flaky pigment.
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