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US 12,222,677 B2Granted
Fine particle, external additive for toner, toner, two-component developer, and method for manufacturing toner
AssigneeCanon Kabushiki Kaisha
InventorsHiroki Watanabe, Ichiro Kanno, Masaharu Miura, Hayato Ida
Life of this patent
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Abstract
A fine particle of a silicon polymer having a siloxane group and a silanol group, wherein a moisture adsorption amount of the fine particle at a temperature of 30° C. and a humidity of 80% RH is from 1.0 mg/g to 22.0 mg/g, an amount of the silanol group of the fine particle measured by a titration method using KOH is from 0.012 mmol/g to 0.120 mmol/g, and a number average particle diameter of primary particle of the fine particle is from 0.05 μm to 0.30 μm.
Claims10
A fine particle, comprising:
- a silicon polymer having a siloxane group and a silanol group;
- the fine particle having a moisture adsorption amount of 1.0 to 22.0 mg/g at a temperature of 30° C. and a humidity of 80% RH,
- an amount of the silanol group of the fine particle measured by a titration method using KOH being 0.012 to 0.120 mmol/g;
- and
- a number average particle diameter of primary particle of the fine particle being 0.05 to 0.30 μm, wherein in a chart obtained by measurement of 29Si-NMR of the fine particle
- S3/A≤0.40
- 0.20≤S4/A≤0.50 and
- 0.40≤S2/A≤0.70
- where a total peak area corresponding to the silicon polymer is denoted by A, a peak area corresponding to a structure represented by formula (a) is denoted by S3, a peak area corresponding to a structure represented by formula (b) is denoted by S4, and a peak area corresponding to a structure represented by formula (c) is denoted by S2,
- where R1 represents an alkyl group having 1 to 6 carbon atoms, and R2 and R3 independently represent an alkyl group having 1 to 6 carbon atoms.
7 more elements
An external additive for toner, comprising:
- a fine particle comprising a silicon polymer having a siloxane group and a silanol group;
- the fine particle having a moisture adsorption amount of 1.0 to 22.0 mg/g at a temperature of 30° C. and a humidity of 80% RH,
- an amount of the silanol group of the fine particle measured by a titration method using KOH being 0.012 to 0.120 mmol/g;
- and
- a number average particle diameter of primary particle of the fine particle being 0.05 to 0.30 μm, wherein in a chart obtained by measurement of 29Si-NMR of the fine particle
- S3/A≤0.40
- 0.20≤S4/A≤0.50 and
- 0.40≤S2/A≤0.70
- where a total peak area corresponding to the silicon polymer is denoted by A, a peak area corresponding to a structure represented by formula (a) is denoted by S3, a peak area corresponding to a structure represented by formula (b) is denoted by S4, and a peak area corresponding to a structure represented by formula (c) is denoted by S2,
- where R1 represents an alkyl group having 1 to 6 carbon atoms, and R2 and R3 independently represent an alkyl group having 1 to 6 carbon atoms.
7 more elements
A two-component developer, comprising:
- a toner and a magnetic carrier;
- the toner comprising a toner particle and an external additive for toner;
- the toner particle comprising a binder resin;
- the external additive comprising a fine particle of a silicon polymer having a siloxane group and a silanol group;
- the fine particle having a moisture adsorption amount of 1.0 to 22.0 mg/g at a temperature of 30° C. and a humidity of 80% RH,
- an amount of the silanol group of the fine particle measured by a titration method using KOH being 0.012 to 0.120 mmol/g;
- and
- a number average particle diameter of primary particle of the fine particle being 0.05 to 0.30 μm, wherein
- in a chart obtained by measurement of 29Si-NMR of the fine particle
- S3/A≤0.40
- 0.20≤S4/A≤0.50 and
- 0.40≤S2/A≤0.70
- where a total peak area corresponding to the silicon polymer is denoted by A, a peak area corresponding to a structure represented by formula (a) is denoted by S3, a peak area corresponding to a structure represented by formula (b) is denoted by S4, and a peak area corresponding to a structure represented by formula (c) is denoted by S2,
- where R1 represents an alkyl group having 1 to 6 carbon atoms, and R2 and R3 independently represent an alkyl group having 1 to 6 carbon atoms.
11 more elements
Dependencies are inferred from the claim text.