Toner and two-component developer
AssigneeSharp Kabushiki Kaisha
InventorsOsamu Wada, Yoritaka Tsubaki
Life of this patent
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Abstract
The peak top molecular weight of the tetrahydrofuran-soluble component of the toner, as measured by gel permeation chromatography, is 4,000 or more and 6,500 or less. The tetrahydrofuran-insoluble component of the toner is 10% by weight or more and 30% by weight or less. When the endothermic peak temperature T1 in the heating process and the exothermic peak temperature T2 during the cooling process originating from the ester wax is measured using a differential scanning calorimeter, the value T1-T2 is 15° C. or more and 30° C. or less.
Claims5
A toner including toner particles containing a polyester resin as a binder resin, and an ester wax as a mold release agent, wherein
- a peak top molecular weight of a tetrahydrofuran-soluble component of the toner, as measured by gel permeation chromatography, is 4,000 or more and 6,500 or less,
- a tetrahydrofuran-insoluble component of the toner is 10% by weight or more and 30% by weight or less with respect to 100% by weight of the toner,
- given an endothermic peak temperature T1 in a heating process and an exothermic peak temperature T2 during a cooling process originating from the ester wax as measured using a differential scanning calorimeter, the value T1-T2 is 15° C. or more and 19° C. or less,
- given an outflow start temperature Ti of the toner and a softening temperature Tm of the toner, which are measured by a flow tester,
- Ti is 85° C. or more and 95° C. or less,
- Tm is 120° C. or more and 140° C. or less, and
- the value Tm-Ti is 25° C. or more and 50° C. or less.
Dependencies are inferred from the claim text.