Canon Kabushiki Kaisha

Noritaka Toyoizumi

Kenji Aoki

Atsushi Tani

Shuntaro Watanabe

Tetsuya Kinumatsu

Yusuke Kosaki

Takashige Kasuya

Takaaki Kaya

Kazumichi Nakahama

Shinnosuke Koji

Takashi Kenmoku

Sakae Suda

Kenta Kamikura

Akane Masumoto

Yu Yoshida

Yuzo Seino

Toshifumi Mori

Takashi Matsui

Tsutomu Shimano

Shohei Kototani

Yoshiaki Shiotari

Shohei Shibahara

Yuna Yamamoto

Mayumi Inoue

Shohei Fukuya

A toner comprising a toner particle comprising a binder resin, wherein the toner particle comprises a condensation product of an organosilicon compound, in time-of-flight secondary ion mass spectrometry of the toner particle, a normalized intensity of silicon ions derived from the condensation product of the organosilicon compound is from 7.00×10to 3.00×10, a normalized intensity of silicon ions after sputtering the toner particle under a specific condition is 6.99×10or lower, the toner comprises a fine particle on the surface of the toner particle, and the fine particle has at least one selected from the group consisting of a specific fine particle of a polyhydric acid metal salt, a strontium titanate fine particle, a titanium oxide fine particle and an aluminum oxide fine particles.

Toner

A toner comprising a toner particle that comprises a toner base particle and an outermost layer present on the toner base particle surface, the toner base particle containing a binder resin wherein a plurality of concave portions are formed on the toner particle surface, and when T (nm) is an average thickness of the outermost layer in analysis of a cross section of the toner particle as observed with TEM, and a (nm) is a long diameter, b (nm) is a short diameter and d (nm) is a depth of each of the concave portions, respectively, when the concave portions on the toner particle are measured by using SPM from an outermost surface of the outermost layer toward the toner particle center, when 'n' represents a number of the concave portions that satisfy specific relationships per 1 μmof the toner particle surface is 30 to 200.

Toner and method for producing toner

A toner comprising a toner particle, wherein the toner particle includes a toner base particle containing a binder resin and includes a protruded portion on a surface of the toner base particle; the protruded portion comprises an organosilicon polymer and a polyhydric acid metal salt; and the polyhydric acid metal salt is present on a surface of the protruded portion.

A toner comprising a toner particle comprising a binder resin and an azo dye, wherein the binder resin comprises a polymer A, the polymer A is a polymer having a monomer unit derived from methacrylonitrile, and a relationship among an amount of substance (mol) of the monomer unit derived from methacrylonitrile, an amount of substance (mol) of the azo dye, and the number of azo groups in the azo dye in the toner particle satisfies formula below:[(amount of substance of azo dye (mol))&#xd7;(number of azo groups in azo dye)/(amount of substance of monomer unit derived from methacrylonitrile (mol))]&#x2264;0.500.

A toner including a toner particle, wherein the toner particle includes a toner base particle containing a binder resin, and a shell on the surface of the toner base particle; the shell contains a metal compound and an organosilicon polymer; the shell has at least an exposed portion of the metal compound and an exposed portion of the organosilicon polymer, on the surface of the toner particle; and in an analysis of a cross section of the toner particle by TEM-EDX, Ha (nm) and Hb (nm) which are average distances from the interface of the toner base particle and the shell up to the toner particle surface at the exposed portion of the metal compound and at the exposed portion of the organosilicon polymer, respectively, on the toner particle surface, satisfy Expression (1) below:+20.0&#x2003;&#x2003;(1).

A method of producing a toner including the steps of: mixing resin fine particles, an organic solvent, and a resin R with a dispersion medium containing carbon dioxide, to prepare a dispersion of resin R-containing droplets; and removing the organic solvent by flowing carbon dioxide, wherein the resin fine particles contain one or more resins that have a partial structure A, B, and C, and are soluble in chloroform; the SP value of the partial structure A, the resin R, and the partial structure B satisfy particular relationships; a resin A constituted of the partial structure A and a resin B constituted of the partial structure B are soluble in the organic solvent; and a resin C constituted of the partial structure C is insoluble in the organic solvent.

Resin fine particles, method of producing resin fine particles, method of producing resin particles, and method of producing toner

A method for producing a toner particle include: (a) mixing a binder resin A, resin fine particles containing a resin B, a resin C, an organic solvent, and carbon dioxide, thereby forming a droplet of a resin solution containing the binder resin A, covered with the resin fine particles; (b) applying a pressure by introducing carbon dioxide, thereby precipitating the resin C at the surface of the droplet; and (c) passing carbon dioxide so as to remove the organic solvent from the droplet with the carbon dioxide. The resin C has an organic polysiloxane structure and a weight average molecular weight of 50,000 to 500,000. The ratio of the weight average molecular weight to the number average molecular weight of the resin C is not more than 5.0. The proportion of the resin C to the rein fine particles is 5.0% by mass to 50.0% by mass.

Methods for producing toner particle and producing resin particle

A toner includes toner particles which contain a binder resin, a colorant, a wax, and a resin A having an organic polysiloxane structure; the amount of Si atoms of the toner particles is 4.5 to 10.0; in an analysis of a cross-section of each toner particle, in a surface layer region R from the periphery of the cross-section of the toner particle to the inside at a distance of 10.0% of the particle diameter in the cross-section of the toner particle, the content of Si atoms derived from the organic polysiloxane structure is 90.0% or more with respect to the total amount of Si atoms contained in the toner particle; and in a line analysis along a straight line between the periphery of the surface layer region R and a gravity center of the cross-section, an intensity count of Si atoms in the toner particle satisfies formula Si&#x3e;Si&#x3e;Si&#x3e;Si&#x2265;0.

Toner and method for manufacturing the same

A method of producing a toner containing a toner particle, including the steps of: a) preparing a resin solution by mixing a resin A and an organic solvent, b) mixing the resin solution, a resin fine particle containing a resin B, and a dispersion medium to form a droplet of the resin solution whose surface has been covered with the resin fine particle, and c) removing the organic solvent in the droplet, in which the resin B is a polymer of a monomer composition containing a monomer X having polymerizable unsaturated groups at the both ends; the monomer X has a peak molecular weight of 5,000 to 50,000; the content of the monomer X is 0.10% to 3.00% by mol; and the following formula (1) is satisfied,|SP&#x2212;SP|&#x2266;2.0&#x2003;&#x2003;(1)where SPand SPrepresent solubility parameters of the resin A and the monomer X, respectively.

Method of producing toner and method of producing resin particle

Provided is a toner, comprising a toner particle having a core-shell structure composed of a core particle and a shell phase on a surface of the core particle, the core particle containing a resin X and a colorant, the shell phase being derived from a resin fine particle containing a resin Y, in which a relationship among a SP value of the resin X, a SP value of the resin Y, and a SP value of an organic solvent falls within a specific range, and a relationship between a number-average particle diameter of the resin fine particle when the resin fine particle is dispersed in water and a number-average particle diameter of the resin fine particle when the resin fine particle is dispersed in the organic solvent falls within a specific range.

Resin particle and method of producing the resin particle, and toner and method of producing the toner

Provided is a toner including toner particle, the toner particle having a core-shell structure having: a core containing a core resin, a colorant, and a wax; and a shell layer containing a resin 'A' on a surface of the core, in which: the resin 'A' contains a segment having an organopolysiloxane structure; the toner particle has an amount of Si derived from the organopolysiloxane structure of 6.0 or more and 10.0 or less, the amount of Si being measured by X-ray photoelectron spectroscopy; the resin &#x201c;A&#x201d; is a polymer of a monomer composition containing a monomer &#x201c;a&#x201d; having two or more polymerizable unsaturated groups in one molecule thereof; and the monomer &#x201c;a&#x201d; satisfies the following formula (1).(&#x2212;1.0)&#xd7;&#x2267;3.0&#xd7;10&#x2003;&#x2003;(1)

A toner comprising a toner particle comprising a binder resin that comprises a crystalline resin, wherein the toner satisfies the following formulas (1) and (2) in DSC measurement of the toner,&#x2266;Tt&#x2266;80.0&#x2003;&#x2003;formula (1)&#x2266;0.20&#x2003;&#x2003;formula (2)whereTt [&#xb0; C.] is the peak temperature of the endothermic peak P, &#x394;H [J/g] is the endothermic quantity from a temperature lower than T't by 20.0&#xb0; C. to a temperature higher than T&#x2032;t by 10.0&#xb0; C. when T&#x2032;t [&#xb0; C.] is the peak temperature of the endothermic peak P, and &#x394;H[J/g] is the endothermic quantity from a temperature lower than T&#x2032;t by 20.0&#xb0; C. to a temperature lower than T&#x2032;t by 3.0&#xb0; C.

A method of producing a toner includes preparing a resin solution containing a binder resin, a colorant and an organic solvent; forming a droplet, a surface of the droplet being covered with a resin fine particle L1; introducing a resin fine particle L2; pressuring by introducing carbon dioxide, and extracting the organic solvent in the droplet; and obtaining the toner particle by removing the carbon dioxide together with the extracted organic solvent, wherein the SP value of the resin R1 constituting the resin fine particle L1 and the SP value of the resin R2 constituting the resin fine particle L2 are each within a specific range.

Method of producing toner

Provided is a method of producing a toner including the steps of: mixing a resin solution comprising a resin R, a colorant, and an organic solvent, a resin fine particle comprising a resin S containing an element &#x3b1;, and carbon dioxide to form a droplet having a surface covered with the resin fine particle; introducing carbon dioxide in a liquid state and pressurizing to extract the organic solvent in the droplet; and removing the extracted organic solvent together with the carbon dioxide to provide a toner particle. In the method of producing a toner, when the resin fine particle is treated with the carbon dioxide in a liquid state, a change in amount of the element &#x3b1; on the surface of the resin fine particle after the treatment as compared to the amount before the treatment falls within a specific range.

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Mishima, Japan

Noritaka Toyoizumi