US 2025/0278034 A1Published application

External additive for toner and toner

AssigneeCanon Kabushiki Kaisha

InventorsMARI KABURAGI, ICHIRO KANNO, YUKIHIRO ABE, JUNICHI TAMURA, HAYATO IDA, KEI INOUE, MASAO SUZUKI, WAKA HASEGAWA

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Abstract

An external additive includes fine particles A that contain an organosilicon compound with a siloxane bond as a binder component and have fine particles B. The fine particles B are present at the surface of the fine particles A in a state at least partially embedded in the surface of the fine particles A. The external additive has a number average diameter of primary particles of 0.03 μm or more and 0.30 μm or less. The ratio BD/AD of the number average diameter BD of primary particles of the fine particles B to the number average diameter AD of primary particles of the fine particles A is 0.05 or more and 0.70 or less. The fine particles B have a volume resistivity of 1.0×105 Ω·cm or more and 1.0×1013 Ω·cm or less and have an embedding rate of 30% or more and 90% or less.

Claims10

Dependent claims

An external additive for toner comprising:

fine particles A containing an organosilicon compound with a siloxane bond as a binder component and having fine particles B,
the fine particles B being present at the surface of the fine particles A in a state at least partially embedded in the surface of the fine particles A,
wherein the external additive has a number average diameter of primary particles of 0.03 μm or more and 0.30 μm or less,
wherein the fine particles A contain units (a), (b), and (c), presented below, in proportions satisfying the following relationships (1) and (2) relative to all of the silicon atoms in the fine particles A, on a number basis:
(
a
)
+
(
b
)
+
(
c
)
≥
0.8
(
1
)
(
b
)
+
(
c
)
≥
0.3
(
2
)
wherein the ratio BD/AD of the number average diameter BD of primary particles of the fine particles B to the number average diameter AD of primary particles of the fine particles A is 0.05 or more and 0.70 or less, and
wherein the fine particles B have a volume resistivity of 1.0×105 Ω·cm or more and 1.0×1013 Ω·cm or less and have an embedding rate of 30% or more and 90% or less, the embedded rate being expressed as the following equation:
Embedding
⁢
rate
⁢
(
%
)
⁢
of
⁢
fine
⁢
particles
⁢
B
=
(
depth
⁢
of
⁢
fine
⁢
particles
⁢
B
⁢
embedded
⁢
in
⁢
fine
⁢
particles
⁢
A
/
diameter
⁢
of
⁢
fine
⁢
particles
⁢
B
)
×
100
,
wherein R1 and R2 each independently represent an alkyl group with 1 to 6 carbon atoms.

82 more elements

Dependencies are inferred from the claim text.