Pearlescent pigment, process for producing the same, coating composition and multilayered coat
AssigneeDainichiseika Color & Chemicals Mfg. Co., Ltd.
InventorsTakashi ABE, Satoru MATSUZAKI, Shotoku TAKAMI
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Abstract
This invention relates to a pearlescent pigment, which is composed of flaky alumina substrate particles produced by a hydrothermal process and coat layers formed on the flaky substrate particles and composed of at least one metal oxide including at least a titanium oxide. The metal oxide has an average particle size of from 1 to 500 nm. According to this invention, it is possible to provide a pearlescent pigment, which has wholly uniform photoluminescence and an elegant and silky feel in combination and can fully satisfy artistry as desired.
Claims7
A process for the production of a pearlescent pigment, comprising the steps of:
- activating surfaces of flaky alumina substrate particles produced by a hydrothermal process, by at least one surface activation method selected from plasma treatment, ultrasonic treatment, acid treatment, alkali treatment, shock treatment and chemical etching treatment;
- dispersing in water the resulting flaky alumina substrate particles with activated surfaces;
- hydrolyzing in the resulting dispersion a metal salt;
- allowing the resulting metal hydroxide or metal oxide to deposit on said surfaces of said flaky alumina substrate particles;
- and then
- subjecting the resulting deposit to heat treatment to form, on said surfaces of said flaky alumina substrate particles, metal oxide coat layers comprising at least titanium oxide and having an average particle size of from 1 to 500 nm.
Dependencies are inferred from the claim text.