Patent ID: 11906928
Assignee: FUJIFILM BUSINESS INNOVATION CORP.
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. An electrostatic charge image developing toner comprising:
a toner particle containing a binder resin; and
an external additive containing:
alumina particles having a volume average particle diameter of more than 5 nm and 80 nm or less; and
silica particles having a volume average particle diameter of 10 nm or more and 90 nm or less,

wherein in the toner particle,
a Net intensity NA of a total of an alkali metal element and an alkaline earth metal element, measured by fluorescence X-ray analysis, is 0.10 kcps or more and 1.30 kcps or less,
the alkali metal element and the alkaline earth metal element contain at least one selected from the group consisting of Na, Mg, and Ca, and
a ratio (Ws/Wa) of a content Ws of the silica particles to a content Wa of the alumina particles is more than 0.5 and less than 35.