TONER
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United States of America
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Issued Date -
Apr 10, 2025
app pub date -
Oct 3, 2024
filing date -
Oct 3, 2024
priority date (Note) -
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Abstract
A toner contains toner particles and an external additive on the surfaces of the toner particles. The external additive includes composite fine particles that include fine particles A containing an organosilicon compound with siloxane bonds as a binder component and fine particles B at least partially embedded in the surfaces of the fine particles A with an embedding rate of 30% to 90% on average, and fine particles C including titanium oxide or titanic acid compound fine particles and having a volume resistivity of 2.0×109 to 2.0×1013 Ω·cm and a number average diameter of primary particles of 10 to 100 nm. The organosilicon compound contains bifunctional, trifunctional, and tetrafunctional silane monomers with specific relationships. The number average diameter X of primary particles of the composite fine particles and the number average diameter Y of primary particles of fine particles C satisfy 1.0≤X/Y≤10.0.
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