Photoluminescent pigment; cosmetic, paint composition, and resin composition containing same; and bright pigment production method
AssigneeNippon Sheet Glass Co., Ltd.
InventorTakeaki Kitamura
Life of this patent
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Abstract
A bright pigment of the present invention is a bright pigment including flaky particles and a metal oxide layer covering each surface of the flaky particles. The metal oxide layer has a thickness variation coefficient (standard deviation of thickness of the metal oxide layer/average thickness of the metal oxide layer) of 20% or less. The bright pigment preferably contains a sodium component, and the sodium component is Na2O. The content of Na2O in the flaky particles is 3% by mass or more and less than 9.5% by mass. The bright pigment preferably has a specific surface area of 5.0 m2/g or less.
Claims13
A bright pigment comprising a flaky particle and a metal oxide layer covering a surface of the flaky particle,
- wherein the metal oxide layer has a thickness variation coefficient (standard deviation of thickness of the metal oxide layer/average thickness of the metal oxide layer) of 20% or less.
A method for producing a bright pigment including a flaky particle and a metal oxide layer covering a surface of the flaky particle, the method comprising:
- a step (step 1) of adding an aqueous solution of a metal compound to a slurry for forming a metal oxide layer containing the flaky particle and acid to deposit a hydrate of an oxide of a metal derived from the metal compound on the surface of the flaky particle, thereby covering the flaky particle with a metal oxide hydrate layer containing the hydrate of the oxide of the metal;
- and
- a step (step 2) of washing and drying the flaky particle covered with the metal oxide hydrate layer, and baking the resultant flaky particle covered with the metal oxide hydrate layer to form the metal oxide hydrate layer into a metal oxide layer,
- wherein the flaky particle to be used for preparing the slurry for forming a metal oxide layer has a zeta potential of −25 mV to −10 mV in hydrochloric acid aqueous solution of pH 2.
Dependencies are inferred from the claim text.