IP Library Granted Patent US 12,631,982
Granted Patent B2
US 12,631,982 · App. 18/173,247 · Granted May 19, 2026

Toner

Inventors: Kosuke Fukudome (Tokyo, JP); Shohei Tsuda (Shizuoka, JP); Kenta Kamikura (Kanagawa, JP); Satoshi Arimura (Shizuoka, JP); Toru Ishii (Shizuoka, JP); Yuta Komiya (Kanagawa, JP)
Assignee: CANON KABUSHIKI KAISHA
G03G9/09708G03G9/09791
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Quick Facts
Patent No.
US 12,631,982
App. No.
18/173,247
Granted
May 19, 2026
Kind
B2
Abstract

A toner comprising a toner particle comprising a binder resin, a fatty acid metal salt particle on a surface of the toner particle, and a hydrotalcite particle on a surface of the toner particle, wherein the hydrotalcite particle comprises fluorine, the fluorine is present inside the hydrotalcite particle in line analysis of STEM-EDS mapping analysis of the toner, and when an area ratio of the fatty acid metal salt particle to the toner particle in an EDS measurement field, which is measured through the STEM-EDS mapping analysis of the toner, is defined as S1(%) and an area ratio of the hydrotalcite particle to the toner particle in the EDS measurement field, which is measured through the STEM-EDS mapping analysis of the toner, is defined as H1(%), S1/H1 is 0.25 to 9.00.

Claims (17)

1 . A toner, comprising:

a toner particle comprising a binder resin;

a fatty acid metal salt particle on a surface of the toner particle; and

a hydrotalcite particle comprising fluorine and aluminum on a surface of the toner particle, wherein

the fluorine and aluminum are present inside the hydrotalcite particle in line analysis of STEM-EDS mapping analysis of the toner,

a ratio F/Al of an atomic concentration of fluorine in the hydrotalcite particle to aluminum in the hydrotalcite particle, obtained from main component mapping of the hydrotalcite particle through the STEM-EDS mapping analysis of the toner, is 0.02 to 0.60, and

S1/H1 is 0.25 to 9.00 when S1(%) is an area ratio of the fatty acid metal salt particle to the toner particle in an EDS measurement field, measured through the STEM-EDS mapping analysis of the toner, and H1(%) is an area ratio of the hydrotalcite particle to the toner particle in the EDS measurement field, measured through the STEM-EDS mapping analysis of the toner.

2 . The toner according to claim 1 , wherein

S2/H2 is 0.10 to 18.00

S2=(metal atomic concentration)×S1×100 and

H2=(F atomic concentration)×H1×100

when F atomic concentration is an atomic concentration of fluorine in the hydrotalcite particle, obtained from main component mapping of the hydrotalcite particle through the STEM-EDS mapping analysis of the toner, and metal atomic concentration is an atomic concentration of metal atoms in the fatty acid metal salt particle, obtained from main component mapping of the fatty acid metal salt particle through the STEM-EDS mapping analysis of the toner.

3 . The toner according to claim 1 , wherein a primary particle of the hydrotalcite particle has a number average particle diameter of 40 to 1100 nm.

4 . The toner according to claim 1 , wherein S3>H3 when S3 (nm) is a number average particle diameter of primary particle of the fatty acid metal salt particle, and H3 (nm) is a number average particle diameter of primary particle of the hydrotalcite particle.

5 . The toner according to claim 1 , wherein the toner particle comprises at least one polyvalent metal element selected from the group consisting of aluminum, magnesium, calcium and iron, and

an atomic concentration of the polyvalent metal element in the toner particle is 0.01 to 0.09 when an atomic concentration of carbon in the toner particle is 100 in main component mapping of the toner particle through the STEM-EDS mapping analysis of the toner.

6 . The toner according to claim 1 , wherein F/Al is 0.04 to 0.32.

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Apr 5, 2023
From: FUKUDOME, KOSUKE; TSUDA, SHOHEI; KAMIKURA, KENTA; ARIMURA, SATOSHI; ISHII, TORU; KOMIYA, YUTA
To: CANON KABUSHIKI KAISHA
Reel/Frame 063236/0606 →
Priority Claims (1)
JP 2022-029588 · Feb 28, 2022 · national
Continuity (1)
Related Publication 20230273538A1 · Aug 31, 2023
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