Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Hidekazu Fumita0
Takayoshi Ootsuka0
Taiji Katsura0
Sara Yoshida0
Yusuke Kosaki0
Kentaro Yamawaki0
Date of Patent
December 12, 2023
0Patent Application Number
173480530
Date Filed
June 15, 2021
0Patent Citations
Patent Primary Examiner
CPC Code
Patent abstract
A toner comprising a toner particle and an external additive, wherein the external additive comprises a composite particle comprising an organosilicon polymer fine particle covering a surface of an alumina particle, a coverage ratio of the surface of the alumina particle with the organosilicon polymer fine particle is 1 to 50 area %, and given A (nm) as a number-average particle diameter of primary particles of the organosilicon polymer fine particle and B (nm) as a number-average particle diameter of primary particles of the alumina particle, following formulae (I) and (II) are satisfied:
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