Cellulosic particle

Patent metadata

Field	Value
Publication number	US-12325779-B2
Application number	US-202318365213-A
Country	US
Kind code	B2
Filing date	Aug 3, 2023
Priority date	Feb 3, 2023
Publication date	Jun 10, 2025
Grant date	Jun 10, 2025

Abstract

A cellulosic particle contains cellulose as its base constituent, and the percentage water absorption of the cellulosic particle measured by method B in ISO 15512:1999 is 11% or more and 20% or less.

First claim

What is claimed is:

1. A cellulosic particle comprising:
a core particle containing cellulose as a base constituent, wherein the cellulose as the base constituent is whereby a cellulose content relative to the core particle is 90% by mass or more; and
a coating layer covering the core particle and containing at least one selected from the group consisting of a fatty acid, a fatty acid metallic salt, and an amino acid compound, and wherein:
a percentage water absorption of the cellulosic particle measured by method B in ISO 15512:1999 is 11% or more and 20% or less.

2. The cellulosic particle according to claim 1 , wherein:
a percentage weight loss of the cellulosic particle after standing in a 28° C. and 85% RH environment for 3 days and subsequent vacuum-drying at 100° C. for 1 hour is 18% or more and 25% or less.

3. The cellulosic particle according to claim 2 , wherein:
an upper geometric standard deviation by number GSDv of the cellulosic particles is 1.0 or greater and 1.7 or less.

4. The cellulosic particle according to claim 1 , wherein:
the fatty acid is a fatty acid having 16 or more and 22 or fewer carbon atoms; and
a number of carbon atoms in the fatty acid metallic salt is 16 or more and 22 or fewer.

5. The cellulosic particle according to claim 1 , wherein:
the fatty acid is a saturated fatty acid; and
the fatty acid metallic salt is a saturated fatty acid metallic salt.

6. The cellulosic particle according to claim 1 , wherein:
the cellulosic particle has an intermediate layer between the core particle and the coating layer; and
the intermediate layer contains at least one selected from the group consisting of a polyamine compound, a polyquaternium, a polysaccharide compound, and a polyacrylic acid.

7. The cellulosic particle according to claim 1 , wherein:
an inorganic particle as an external additive is present on the cellulosic particle.

8. The cellulosic particle according to claim 1 , wherein:
a volume-average particle diameter of the cellulosic particles is 3 μm or more and less than 10 μm.

9. The cellulosic particle according to claim 1 , wherein:
an upper geometric standard deviation by number GSDv of the cellulosic particles is 1.0 or greater and 1.7 or less.

10. The cellulosic particle according to claim 1 , wherein:
sphericity of the cellulosic particle is 0.7 or greater.

11. The cellulosic particle according to claim 1 , wherein:
surface smoothness of the cellulosic particle is 50% or more.

12. The cellulosic particle according to claim 1 , wherein:
a number-average molecular weight of the cellulose is 37000 or more.

13. The cellulosic particle according to claim 12 , wherein:
the number-average molecular weight of the cellulose is 45000 or more.

Assignees

• Fujifilm Business Innovation Corp

Inventors

• Yao Kenji
• Kashiwagi Satomi
• Matoba Shota
• NAITO Ayu
• Yoshida Kazusei
• Iwadate Yuko
• Oki Masahiro
• Ishizuka Takahiro
• Yoshikawa Hideaki
• Taguchi Tetsuya
• Hamano Hirokazu
• Iwanaga Takeshi

Classifications

• C08J2377/04

  Polyamides derived from alpha-amino carboxylic acids (C08J2377/10 takes precedence) · CPC title

• C08J2305/02

  Dextran; Derivatives thereof · CPC title

• C08J2301/12

  Cellulose acetate · CPC title

• C08J2401/28

  Alkyl ethers · CPC title

• C08J2301/14

  Mixed esters · CPC title