Hollow particles and production method therefor, and white ink

Patent metadata

Field	Value
Publication number	US-11345820-B2
Application number	US-201816763506-A
Country	US
Kind code	B2
Filing date	Dec 10, 2018
Priority date	Dec 11, 2017
Publication date	May 31, 2022
Grant date	May 31, 2022

Abstract

Hollow particles containing monocrystalline titanium oxide and silica, and having a titanium oxide content of 86.0-99.5 mol % and a silica content of 0.5-14.0 mol %; and a method of producing the particles. A white ink containing the hollow particles as a coloring agent; the use of the white ink in inkjet recording; and a method for inkjet recording using the white ink.

First claim

The invention claimed is:

1. A hollow particle containing a mixture of titanium oxide monocrystal and silica, wherein a content of the titanium oxide is 86.0 mol % to 99.5 mol % and a content of the silica is 0.5 mol % to 14.0 mol %.

2. The hollow particle according to claim 1 , wherein a primary particle diameter of the hollow particle is 10 nm to 1,000 nm.

3. The hollow particle according to claim 1 , wherein a value of A/B is 0.3 to 0.95, wherein A and B represent an inner diameter and a primary particle diameter of the hollow particle, respectively.

4. The hollow particle according to claim 1 , wherein a variation coefficient of the primary particle diameter is 10% or less.

5. A white ink containing the hollow particle according to claim 1 , wherein the white ink is used as a coloring agent.

6. The white ink according to claim 5 , wherein the white ink is an ink selected from the group consisting of aqueous inks, latex inks, solvent inks and ultraviolet curable inks.

7. An inkjet recording method, comprising ejecting droplets of the white ink according to claim 5 using an ink jet printer, wherein the droplets are attached to a recording medium.

8. A method of producing a hollow particle, comprising:
forming a shell containing a titanium oxide precursor and a silica precursor on a surface of a template particle, which becomes a core, to obtain a core/shell particle;
removing the template particle from the core/shell particle to obtain a shell particle; and
firing the shell particle in an air atmosphere to obtain the hollow particle according to claim 1 .

9. The method according to claim 8 , wherein the template particle is a polymer particle.

10. The method according to claim 8 , wherein the template particle is a polymer particle containing styrene as a constituent monomer.

11. The method according to claim 8 , wherein the template particle is a styrene-(meth)acrylic acid polymer particle.

12. The method according to claim 8 , wherein obtaining the core/shell particle is performed in the presence of a dispersant.

13. A method of producing a hollow particle, comprising:
forming a shell containing a titanium oxide precursor and a silica precursor on a surface of a template particle which becomes a core, to obtain a core/shell particle, and
firing the core/shell particle in an air atmosphere to remove the template particle to obtain the hollow particle according to claim 1 .

Assignees

• Nippon Kayaku Kk

Inventors

• Hara Yukihiro
• Nohara Akihiro

Classifications

• B01J13/02

  Making microcapsules or microballoons {(for medical preparations A61K9/50)} · CPC title

• C04B2235/441

  Alkoxides, e.g. methoxide, tert-butoxide · CPC title

• C04B2235/3418

  Silicon oxide, silicic acids or oxide forming salts thereof, e.g. silica sol, fused silica, silica fume, cristobalite, quartz or flint · CPC title

• C09D11/322

  Pigment inks · CPC title

• C04B38/009

  Porous or hollow ceramic granular materials, e.g. microballoons (C04B18/027, C04B20/002 take precedence) · CPC title