Zinc oxide phosphor and method for producing same

Patent metadata

Field	Value
Publication number	US-11312902-B2
Application number	US-201716302009-A
Country	US
Kind code	B2
Filing date	Jun 30, 2017
Priority date	Jun 30, 2016
Publication date	Apr 26, 2022
Grant date	Apr 26, 2022

Abstract

The present invention provides a method for easily and simply producing a zinc oxide phosphor that has a high level of safety and a high emission intensity and is useful for, for example, cosmetic applications. The present invention also provides a zinc oxide phosphor having such excellent physical properties and a cosmetic product containing the same. Provided is a method for producing a zinc oxide phosphor, including: a raw material mixing step of mixing an oxygen-containing zinc compound and a sulfur-containing compound; and a firing step of firing the raw material mixture obtained in the raw material mixing step, the firing step including firing in a reducing atmosphere followed by firing in an oxygen-containing atmosphere.

First claim

The invention claimed is:

1. A method for producing a zinc oxide phosphor, comprising:
a raw material mixing step of mixing an oxygen-containing zinc compound and a sulfur-containing compound; and
a firing step of firing the raw material mixture obtained in the raw material mixing step,
the firing step including firing in a reducing atmosphere followed by firing in an oxygen-containing atmosphere.

2. The method for producing a zinc oxide phosphor according to claim 1 ,
wherein the firing in an oxygen-containing atmosphere is performed at a firing temperature of 500° C. or higher and lower than 1000° C.

3. The method for producing a zinc oxide phosphor according to claim 1 ,
wherein the zinc oxide phosphor is a cosmetic raw material.

4. A zinc oxide phosphor which complies with the purity requirements of “Carbonate, and clarity and color of solution” and “Lead” specified in “Zinc Oxide” in Japanese Standards of Quasi-drug Ingredients (2006),
wherein the zinc oxide phosphor has an internal quantum efficiency of 10% or higher.

5. The zinc oxide phosphor according to claim 4 , which has a BET diameter of 1.2 μm or smaller.

6. A solid cosmetic product comprising the zinc oxide phosphor according to claim 4 .

7. A method for producing a solid cosmetic product, comprising the step of mixing raw materials including a zinc oxide phosphor obtained by the method according claim 1 , talc, sericite, and an oil component and compression-molding the raw material mixture.

8. A zinc oxide phosphor which satisfies the following:
when 2.0 g of the zinc oxide phosphor is shaken with 10 mL of pure water, followed by addition of 30 mL of 10% sulfuric acid and heating on a water bath with stirring, no effervescence occurs or the solution is clear and colorless; and
when 20 mL of pure water is added to 2.0 g of the zinc oxide phosphor, followed by addition, with stirring, of 5 mL of glacial acetic acid and heating on a water bath to effect dissolution, addition of five drops of a potassium chromate reagent to the solution after cooling produces no turbidity or cloudiness,
wherein the zinc oxide phosphor has an internal quantum efficiency of 10% or higher.

Assignees

• Sakai Chemical Industry Co

Inventors

• Ishikawa Momoko
• Kobayashi Keita
• Ogata Nanae
• Mori Kenji
• TOJO Tomonori

Classifications

• A61Q17/04

  Topical preparations for affording protection against sunlight or other radiation; Topical sun tanning preparations · CPC title

• A61K2800/434

  Luminescent, Fluorescent; Optical brighteners; Photosensitizers · CPC title

• A61K8/24

  Phosphorous; Compounds thereof · CPC title

• C09K11/54 Primary

  containing zinc or cadmium · CPC title

• A61K8/27 Primary

  Zinc; Compounds thereof · CPC title