Cellulosic particle

Patent metadata

Field	Value
Publication number	US-12460054-B2
Application number	US-202318366674-A
Country	US
Kind code	B2
Filing date	Aug 7, 2023
Priority date	Feb 3, 2023
Publication date	Nov 4, 2025
Grant date	Nov 4, 2025

Abstract

A cellulosic particle contains cellulose as its base constituent, and the intensity of sodium fluorescent x-rays from the cellulosic particle measured by x-ray fluorescence analysis is 0.015 kps or more and 0.1 kps or less.

First claim

What is claimed is:

1 . A cellulosic particle comprising:
a core particle containing cellulose as a base constituent; a coating layer covering the core particle and containing at least one selected from the group consisting of a fatty acid and a fatty acid metallic salt; and an intermediate layer between the core particle and the coating layer, wherein the fatty acid is a saturated fatty acid, the fatty acid metallic salt is a saturated fatty acid metallic salt, the intermediate layer is at least one selected from the group consisting of a polyamine compound, a polyquaternium, a polysaccharide compound, and a polyacrylic acid, and an intensity of sodium fluorescent x-rays measured by x-ray fluorescence analysis is 0.015 kps or more and 0.1 kps or less.

2 . The cellulosic particle according to claim 1 , wherein:
an intensity of chlorine fluorescent x-rays measured by x-ray fluorescence analysis is 0.003 kps or more and 0.08 kps or less.

3 . The cellulosic particle according to claim 1 , wherein:
an intensity of sulfur fluorescent x-rays measured by x-ray fluorescence analysis is 0.01 kps or more and 0.05 kps or less.

4 . The cellulosic particle according to claim 1 , wherein:
an intensity of calcium fluorescent x-rays measured by x-ray fluorescence analysis is 2 kps or more and 30 kps or less.

5 . 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.

6 . The cellulosic particle according to claim 1 , wherein:
the cellulosic particle has an inorganic particle as an external additive.

7 . 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.

8 . 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.

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

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

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

12 . The cellulosic particle according to claim 11 , wherein:
the number-average molecular weight of the cellulose is 45000 or more.

Assignees

• Fujifilm Business Innovation Corp

Inventors

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

Classifications

• C08L1/10

  Esters of organic acids {, i.e. acylates} · CPC title

• C08L1/02

  Cellulose; Modified cellulose · CPC title

• C08K2003/265

  Calcium, strontium or barium carbonate · CPC title

• C08K5/175

  containing COOH-groups; Esters or salts thereof · CPC title

• C08K5/098

  Metal salts of carboxylic acids · CPC title