Toner
AssigneeCanon Kabushiki Kaisha
InventorsTakashi Kenmoku, Kenta Kamikura, Yuzo Seino
Life of this patent
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Abstract
A toner containing a toner particle, wherein, when a dielectric loss tangent measured at a frequency of 10 kHz in an impedance measurement on the toner in an environment having a temperature of 50° C. and a relative humidity of 50% RH is designated by tan δ50° C.(1), and a dielectric loss tangent measured at a frequency of 10 kHz in an impedance measurement on the toner in an environment having a temperature of 30° C. and a relative humidity of 50% RH after the impedance measurement on the toner in an environment having a temperature of 50° C. and a relative humidity of 50% RH is designated by tan δ30° C.(2), tan δ50° C.(1) is from 0.015 to 0.050, the relationship tan δ50° C.(1)>tan δ30° C.(2) is satisfied, and tan δ30° C.(2)/tan δ50° C.(1) is from 0.25 to 0.66.
Claims7
A toner, comprising:
- a toner particle comprising a binder resin, wherein
- when measuring impedances in accordance with a series of impedance measurements including the steps of:
- (i) preparing a first treated sample by leaving the toner under an environment of a temperature of 30° C. and relative humidity of 50% for 20 minutes;
- (ii) measuring an impedance of the first treated sample under an environment of a temperature of 30° C. and relative humidity of 50% while varying a frequency from 100 kHz to 0.0215 Hz;
- (iii) preparing a second treated sample by leaving the first treated sample for 20 minutes under an environment of a temperature of 50° C. and relative humidity of 50%;
- (iv) measuring an impedance of the second treated sample under environment of a temperature of 50° C. and a relative humidity of 50% while varying a frequency from 100 kHz to 0.0215 Hz;
- (v) preparing a third treated sample by leaving the second treated sample for 20 minutes under an environment of a temperature of 30° C. and relative humidity of 50%;
- and
- (vi) measuring an impedance of the third treated sample under environment of a temperature of 30° C. and a relative humidity of 50% while varying a frequency from 100 kHz to 0.0215 Hz,
- 0.015≤tan δ50° C.(1)≤0.050 and 0.25≤tan δ30° C.(2)/tan δ50° C.(1)≤0.66
- when tan δ50° C. (1) is a dielectric loss tangent at a frequency of 10 kHz calculated from the impedance measured in step (iv) and tan δ30° C. (2) is a dielectric loss tangent at a frequency of 10 kHz calculated from the impedance measured in step (vi).
Dependencies are inferred from the claim text.