Samsung Electronics Co., Ltd.

Hewlett-packard Development Company, L.P.

Akinori Terada

Masahide Yamada

Kenichi Miyamoto

Keiichi Ishikawa

Keiji Komoto

Rie Sakurai

Takahiro Danno

Osamu Ieda

A toner particle comprising: a binder resin; a colorant; and a wax, wherein the binder resin comprises: a first amorphous polyester resin having a pendant group; a second amorphous polyester resin having no pendant group; and a crystalline polyester resin, and wherein a difference between a Solubility Parameter (SP) value of the first amorphous polyester resin and an SP value of the second amorphous polyester resin is 0.3 or more.

Toner particle with amorphous polyester resin

A toner particle includes a core particle including a binder resin, and a plurality of fine particles that are smaller than the core particle and that are attached to a surface of the core particle. The fine particles include silica fine particles, and inorganic fine particles having a band gap energy of 2.5 to 7.0 eV and a relative permittivity of 30 to 100. The toner particle has a content of titanium dioxide of less than 1% by mass.

Toner particle with core particle and fine particles

A toner for developing an electrostatic charge image, the toner including: elemental iron, wherein a content of the elemental iron is in a range of 1.0&#xd7;10to 1.0&#xd7;10ppm, based on a total weight of the toner; elemental silicon, wherein a content of the elemental silicon is in a range of 1.0&#xd7;10to 5.0&#xd7;10ppm, based on a total weight of the toner; elemental sulfur, wherein a content of the elemental sulfur is in a range of 500 to 3,000 ppm, based on a total weight of the toner; optionally elemental fluorine, wherein a content of the elemental fluorine, if present, is in a range of 1.0&#xd7;10to 1.0&#xd7;10ppm; and a binder resin.

Toner for developing electrostatic charge image and method for preparing the same

A toner for developing an electrostatic charge image includes three or more elements selected from a group including an iron element, a silicon element, a sulfur element and a fluorine element and a binder resin including an amorphous polyester-based resin.

A toner for electrostatic use includes a binder resin including an amorphous polyester resin having a urethane bond and a crystalline polyester resin, a metal ion forming a chemical bond with the binder resin, at least one colorant forming a coordinate bond with the metal ion and being supported on the binder resin through the metal ion, and at least three elements selected from an iron element, a silicon element, a sulfur element, and a fluorine element while including at least one of an iron element, a silicon element, and a sulfur element, wherein an amount of the iron element is about 1000 ppm to about 10000 ppm as an element concentration, an amount of the silicon element is about 1000 ppm to about 5000 ppm as an element concentration, and an amount of the sulfur element is about 500 ppm to about 3000 ppm as an element concentration.

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Yokohama, Japan

Akinori Terada