Canon Kabushiki Kaisha

Koji Inaba

Tatsuya Nakamura

Tatsuhiko Chiba

Takashige Kasuya

Makoto Kanbayashi

Shinya Yachi

Yasushi Katsuta

Satoshi Handa

Yuji Moriki

Kazuyuki Miyano

Kazunori Kato

Hiroaki Kawakami

Katsuyuki Nonaka

Kazumi Yoshizaki

Yoshihiro Nakagawa

Michihisa Magome

Manabu Ohno

Kenta Kamikura

Masayoshi Kato

Satoshi Matsunaga

Shuichi Aita

Ryota Kashiwabara

Kengo Hayase

Takao Ishiyama

Yuki Nishio

Makoto Kanabayashi

Ken-ichi Nakayama

Ken-Ichi Nakayama

Provided is a toner including toner particles each containing at least a binder resin, a colorant, and a wax component, and an inorganic fine powder, the toner being wherein: in a microscopic compression test on the toner, a recovery ratio Z(25) and the gradient of a load-displacement curve R(25) each satisfy a specific range; and the toner has a glass transition temperature (TgA) measured with a differential scanning calorimeter (DSC) in a specific range and a temperature (P) of the highest endothermic peak measured with the DSC in a specific range, and the temperature (P) of the highest endothermic peak and the glass transition temperature (TgA) satisfy a specific relationship.

Toner

Provided is anon-magnetic toner including toner particles each containing at least a binder resin, a colorant, and a wax component, and an inorganic fine powder, in which: (1) when a temperature in a temperature range of 50 to 80&#xb0; C. at which a loss tangent (tan &#x3b4;) shows a maximum is represented by T1, a storage elastic modulus of the toner at the temperature T1 (G'(T1)) satisfies a relationship of 5.00&#xd7;10&#x2266;G&#x2032;(T1)&#x2266;1.00&#xd7;10(dN/m); (2) a continuous temperature range with a width of 15&#xb0; C. or more in which the loss tangent (tan &#x3b4;) is 0.80 to 2.00 is present in the temperature range of 50 to 80&#xb0; C.; and (3) the loss tangent (tan &#x3b4;) is 1.00 or more in a temperature range of 120 to 160&#xb0; C.

Non-magnetic toner

To achieve improvements in developing performance, transferring performance, and fixing performance, a toner has a glass transition temperature (TgA) of 40 to 60&#xb0; C. and a temperature (P1) of the highest peak of 70 to 120&#xb0; C.; cyclohexane (CHX) insoluble matter in the tetrahydrofuran (THF) soluble matter of the toner has a glass transition temperature (TgB) of 80 to 120&#xb0; C.; TgA and TgB satisfy a specific formula; the toner has a viscosity at 100&#xb0; C. of 5,000 to 30,000 Pa&#xb7;s; and the cyclohexane (CHX) insoluble matter has an acid value of 5 to 40 mgKOH/g.

A toner having a good chargeability stable against an environmental change is formed of toner particles each comprising at least a binder resin, a colorant, a release agent and a sulfur-containing polymer, and an external additive. The toner particles contain 100 to 30,000 ppm by weight thereof of at least one stabilizer element selected from the group consisting of magnesium, calcium, barium, zinc, aluminum and phosphorus. The toner particles may preferably be produced by suspension polymerization of a monomer composition containing the sulfur-containing polymer in an aqueous medium containing a dispersion stabilizer having the stabilizer element.

Toner, toner production process and image forming method

A process for producing a polymerization toner, which comprises preparing a polymerizable-monomer composition which contains at least a polymerizable monomer and a colorant and does not contain any polymerization initiator, i) introducing the polymerizable-monomer composition into an aqueous medium to effect granulation, adding a polymerization initiator to the aqueous medium in the course of the granulation or after the granulation has been completed, or ii) adding a polymerization initiator in an aqueous medium, introducing the polymerizable-monomer composition into the aqueous medium to effect granulation, and then polymerizing the polymerizable-monomer composition having been granulated, to produce toner particles. In the process, the polymerization initiator is added in a specific time and a specific manner.

Process for producing polymerization toner

A toner contains at least a binder resin, a colorant, a wax and an aluminum compound, wherein the binder resin has an acid value of 1 to 40 mgKOH/g; the binder resin contains 2% to 50% by weight of tetrahydrofuran (THF) based on the weight of the binder resin; a tetrahydrofuran-soluble matter of the binder resin has a main peak in a molecular weight range of from 2,000 to 30,000 in a chromatogram by gel permeation chromatography (GPC); and the aluminum compound is a specific aluminum compound of substituted or unsubstituted benzilic acid.

Toner containing aluminum benzilic acid compound and image forming method

In an image forming method for forming multi-color images or full-color images, first to third or fourth toners are used, and the amount of cross-linking agent contained in each of the toners becomes larger in the order of the toners laid on a recording sheet. Each of the toners has a color different from the others, the color selected from yellow, cyan, magenta and black.

Image forming method

A toner which comprises toner particles containing a binder resin, a colorant, a polar resin and a release agent, wherein the binder resin is a styrene polymer, a styrene copolymer, or a mixture of these, and has a weight average molecular weight Mw.sub.1 of from 10,000 to 1,000,000, the polar resin is a polyester resin containing a tetrahydrofuran-soluble matter of which weight average molecular weight Mw.sub.2 is from 7,000 to 50,000 and an ethyl alcohol-soluble matter of which weight average molecular weight Mw.sub.3 is from 1,000 to 7,000, where Mw.sub.2 /Mw.sub.3 is from 1.2 to 10.

Toner for developing electrostatic images, and process for producing the

A toner for developing electrostatic images, which comprises a binder resin, a colorant and a wax composition, characterized in that the wax composition has a molecular weight distribution as measured by GPC, having a maximum in the region of molecular weight of from 350 to 850 and a maximum in the region of molecular weight of from 900 to 4,000; and the wax composition contains an ester wax with a weight average molecular weight (Mw) of from 350 to 4,000 and a number average molecular weight of from 200 to 4,000.

Toner for developing electrostatic images

An image-forming method is disclosed. A color toner image formed on an electrostatic latent image carrier is transferred onto one surface of a transfer material and fixed on the transfer material by a fixing means through heating and melting. An other color toner image formed on the electrostatic latent image carrier is transferred onto an other surface opposite to the color toner-fixed surface of the transfer material and fixed, thereby forming color images fixed on both surfaces of the transfer material. The color toner forming the color images contains toner particles directly obtained by suspension polymerization, and the toner particles contain wax.

Method for transferring color images onto both sides of a transfer

A color toner for developing an electrostatic image has color toner particles containing a binder resin and a colorant. The color toner particles have been obtained by mixing a mixture containing at least a polymerizable monomer, the colorant and a polymerization initiator to prepare a polymerizable monomer composition, dispersing the polymerizable monomer composition in an aqueous medium to carry out granulation, and polymerizing polymerizable monomers in the aqueous medium. The colorant comprises fine organic pigment particles or fine organic dye particles having an acetic acid adsorption heat in n-heptane of from 0.1 mJ/m.sup.2 to 80 mJ/m.sup.2.

Color toner for developing electrostatic images, process for its

A toner for developing an electrostatic image comprises toner particles containing a binder resin, a colorant and a wax. The toner contains polymerizable vinyl monomer or a mixture of organic solvent and polymerizable vinyl monomer in an amount of not more than 1,000 ppm. The toner particles are those obtained by mixing a mixture containing, at least, one or plural kinds of polymerizable vinyl monomer, a styrene-diene copolymer comprised of styrene or a styrene derivative and butadiene or isoprene in a copolymerization weight ratio of from 95:5 to 65:35, the colorant, the wax and a polymerization initiator to prepare a polymerizable monomer composition; dispersing the polymerizable monomer composition in an aqueous medium to carry out granulation; and polymerizing the polymerizable vinyl monomer in the aqueous medium.

Toner for developing electrostatic images, and process for its production

A toner for developing electrostatic images which comprises a toner particle produced by polymerizing a polymerizable monomer composition,

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Yokohama, Japan

Koji Inaba