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US 12,601,986 B2Granted
Toner, resin particles, developer, toner storage unit, image forming apparatus, method for producing toner, and image forming method
AssigneeRicoh Company, Ltd.
InventorsTomomi Harashima, Junichi Watanabe, Hiroshi Yamashita, Shinya Nakayama
Life of this patent
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Abstract
Provided is a toner including toner base particles. Each toner base particle includes a crosslinked component. The crosslinked component includes a nonlinear polymer having 3 or more branches, terminals of which are metal ion crosslinked, and a glass transition temperature Tg of the nonlinear polymer as measured by differential scanning calorimetry is −60° C. or higher but lower than 0° C.
Claims14
A toner, comprising:
- toner base particles, each toner base particle including
- a crosslinked component,
- wherein the crosslinked component includes a nonlinear polymer obtained from reaction of polyester resin and HDI isocyanurate, terminals of which are metal ion crosslinked, and
- a glass transition temperature Tg of the nonlinear polymer as measured by differential scanning calorimetry is −60° C. or higher but lower than 0° C.;
- and
- wherein the toner contains a THF-insoluble fraction with respect to a total mass of the toner, the content of which is between 15% and 35% by mass;
- and
- wherein the metal ion crosslink of the nonlinear polymer includes two or more divalent or higher metal ions.
5 more elements
A toner comprising
- toner base particles, each of the toner base particles including
- a crosslinked component,
- wherein the crosslinked component includes a binder resin, and the binder resin includes a tetrahydrofuran (THF) insoluble component,
- the THF insoluble component includes a nonlinear polymer obtained from reaction of polyester resin and HDI isocyanurate, terminals of which are metal ion crosslinked,
- wherein an amount of the THF insoluble component is from 15% by mass through 35% by mass, and
- a glass transition temperature Tg of the THF insoluble component as measured by differential scanning calorimetry is −60° C. or higher but lower than 0° C.,
- wherein the metal ion crosslink of the nonlinear polymer includes two or more divalent or higher metal ions.
4 more elements
Resin particles each comprising
- a crosslinked component,
- wherein the crosslinked component includes a binder resin, and the binder resin includes a tetrahydrofuran (THF) insoluble component,
- the THF insoluble component includes a nonlinear polymer obtained from reaction of polyester resin and HDI isocyanurate, terminals of which are metal ion crosslinked, and
- a glass transition temperature Tg of the THF insoluble component as measured by differential scanning calorimetry is −60° C. or higher but lower than 0° C.,
- wherein the metal ion crosslink of the nonlinear polymer includes two or more divalent or higher metal ions.
2 more elements
A toner, comprising:
- toner base particles, each toner base particle including
- a crosslinked component,
- wherein the crosslinked component includes a nonlinear polymer having 3 or more branches, terminals of which are metal ion crosslinked, and
- a glass transition temperature Tg of the nonlinear polymer as measured by differential scanning calorimetry is −60° C. or higher but lower than 0° C.;
- and
- wherein the toner contains a THF-insoluble fraction with respect to a total mass of the toner, the content of which is between 15% and 35% by mass;
- and
- wherein the metal ion crosslink of the nonlinear polymer includes two or more divalent or higher metal ions,
- wherein the two or more divalent or higher metal ions include any one of a strontium ion, a gallium ion, an indium ion, and a thallium ion.
6 more elements
Dependencies are inferred from the claim text.