US 12,710,704 B2Granted

External additive for toner and toner

AssigneeCanon Kabushiki Kaisha

InventorsIchiro Kanno, Yukihiro Abe, Junichi Tamura, Mari Kaburagi, Hayato Ida, Masao Suzuki, Kei Inoue, Waka Hasegawa

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Abstract

An external additive for toner comprising: a fine particle A containing, as a binder component, an organosilicon compound having a siloxane bond; and a fine particle B that is present on a surface of the fine particle A in a state of being at least partially embedded in the surface of the fine particle A, wherein the external additive for toner (i) has a number-average particle diameter of a primary particle of 0.03 μm or more and 0.30 μm or less, and (ii) has a Young's modulus of 10 GPa or more and 30 GPa or less, wherein content ratios, on a number basis, of the following unit (a), unit (b), and unit (c) in the fine particle A based on all silicon atoms present in the fine particle A satisfy the following expressions (1) and (2). ( a ) + ( b ) + ( c ) ≥ 0.8 ( 1 ) ( b ) + ( c ) ≥ 0.3 ( 2 )

Claims9

Dependent claims

An external additive for toner comprising:

a fine particle A containing, as a binder component, an organosilicon compound having a siloxane bond;
and
a fine particle B that is present on a surface of the fine particle A in a state of being at least partially embedded in the surface of the fine particle A,
wherein the external additive for toner
(i) has a number-average particle diameter of a primary particle of 0.03 μm or more and 0.30 μm or less, and
(ii) has a Young's modulus of 10 GPa or more and 30 GPa or less,
wherein content ratios, on a number basis, of the following unit (a), unit (b), and unit (c) in the fine particle A based on all silicon atoms present in the fine particle A satisfy the following expressions (1) and (2):
(
a
)
+
(
b
)
+
(
c
)
≥
0.8
(
1
)
(
b
)
+
(
c
)
≥
0.3
(
2
)
wherein the fine particle B is an inorganic fine particle having a Young's modulus of 50 GPa or more and 200 GPa or less, and
wherein the fine particle B has an average value of embedding ratios, each of which is represented by the following expression, of 30% or more and 90% or less,
(
a
)
+
(
b
)
+
(
c
)
≥
0.8
(
1
)
(
b
)
+
(
c
)
≥
0.3
(
2
)
where R1 and R2 each independently represent an alkyl group having 1 or more and 6 or less carbon atoms.

63 more elements

Dependencies are inferred from the claim text.

Facts

Application: 18/511,737Filed 16 Nov 2023
Priority: JP 2022-18391217 Nov 2022
Published: US 2024/0184226 A16 Jun 2024
Granted: 18 Aug 2026
Term ends: Not estimatedThe source records don’t support an estimate.

Classification5 codes

G03G 9/09775
Organic compounds: containing atoms other than carbon, hydrogen or oxygen
G03G 9/09708
Plasticisers; Charge controlling agents: inorganic compounds
G03G 9/09716
Inorganic compounds: treated with organic compounds
G03G 9/09725
Inorganic compounds: silicon-oxides; Silicates