Canon Kabushiki Kaisha

Takashige Kasuya

Kenji Aoki

Atsushi Tani

Shuntaro Watanabe

Tetsuya Kinumatsu

Yoshihiro Ogawa

Takaaki Kaya

Tatsuya Nakamura

Tatsuhiko Chiba

Hiroshi Yusa

Yusuke Hasegawa

Makoto Kanbayashi

Yusuke Kosaki

Toshifumi Mori

Katsuhisa Yamazaki

Noritaka Toyoizumi

Takayuki Nagatsuka

Ayako Okamoto

Satoshi Matsunaga

Junko Nishiyama

Yoshihiro Nakagawa

Takakuni Kobori

Syuhei Moribe

Masaichiro Katada

Miho Okazaki

Hiroaki Kawakami

Shinji Doi

Kaori Hiratsuka

Yusuke Karami

Kouji Nishikawa

Yuki Karaki

Koji Nishikawa

Tsuyoshi Takiguchi

Shuhei Moribe

Kazumichi Nakahama

Koji Inaba

Kazuyuki Miyano

Shinnosuke Koji

Shinichiro Abe

Tomohisa Sano

Koichi Tomiyama

Yasuhide Goseki

Tsutomu Onuma

Hiroyuki Suematsu

Tadashi Dojo

Noboru Kashimura

Takeshi Naka

Kohji Inaba

Nene Shibayama

Tsuneo Nakanishi

Yuichi Mizoo

Hideto Iida

Masami Azuma

Hirohide Tanikawa

Sakae Suda

Satoshi Yoshida

Masami Fujimoto

Daisuke Yoshiba

Kimihiro Yoshimura

Takeshi Menjo

Tatsuya Ikezue

Shoji Amamiya

Nobuyuki Okubo

Yosuke Morikawa

Haruyuki Tsuji

Kazushige Nakamura

Masuo Yamazaki

Harumi Sakoh

Kiyoko Tsuchiya

Masaaki Yamagami

Kazuo Maruyama

Masao Takano

Kiyoko Maeda

Tsutomu Kukimoto

Manabu Ohno

Yoshitaka Suzumura

Masanori Ito

Shuichi Hiroko

Satoshi Handa

Motoo Urawa

Keita Nozawa

Osamu Tamura

Junko Hirata

Kentarou Kamae

Makoto Kanabayashi

Hirata Junko

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)

Toner

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.

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.

Method of producing toner

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.

A method of producing a toner containing a toner particle having a core-shell structure that has a core containing a resin and has a shell phase on a surface of the core, the shell phase being derived from a resin fine particle containing a resin A, and the resin A being a resin containing a segment derived from a crystalline polymer D, the method including steps (i), (ii) and (iii).

Provided is a toner containing toner particles, each of which includes a binder resin containing a polyester as a main component, a colorant, and a wax, in which the binder resin includes a block polymer in which a segment capable of forming a crystalline structure and a segment incapable of forming a crystalline structure are bonded, the toner has a maximum endothermic peak from the binder resin, as determined by differential scanning calorimetry measurement, with a peak temperature in a specific range and with an endothermic quantity in a specific range, and the wax is an ester wax having a functionality of 3 or more.

A method for producing a toner that comprises toner particles, each of which comprises a binder resin, which comprises a resin (A) capable of forming a crystalline structure, and a colorant, the method including: a pressure holding step of, after preparing toner particles, holding the toner particles for 5 minutes or more at a pressure of 2.0 MPa or more under conditions of a temperature T1 (&#xb0; C.) represented by formula (1):20&#x2266;1&#x2266;2&#x2003;&#x2003;(1)(wherein, Tp2 represents the onset temperature of the maximum endothermic peak derived from the resin (A)), wherein a peak temperature Tp1 of the maximum endothermic peak derived from the resin (A) during the first temperature rise of the toner particles as determined by differential scanning calorimetric measurement is 50&#xb0; C. to 90&#xb0; C.

Toner production method

A toner has toner particles containing a binder resin that comprises a block polymer as a main component, obtained by chemically bonding a crystalline polyester resin with an amorphous polyurethane resin, wherein the binder resin has a specific content of a crystalline polyester resin component, and has a concentration of ester bonds derived from the crystalline polyester resin component of not more than 5.2 mmol/g, and The maximum value Eof the flexural elasticity modulus E in a three-point bending test on the toner and the strain energy u for the toner satisfy specific values.

A toner having good low-temperature fixability, charge stability, environmental stability, and durability and capable of stably producing high-quality images for a long time is provided. The toner includes a toner particle having a core-shell structure constituted of a core and a shell phase. The core contains a binder resin, a colorant, and wax, and the shell phase contains a resin A. The resin A is a comb polymer including a main chain portion (X), a side chain portion (Y), and a side chain portion (Z). The main chain portion (X) is a vinyl polymer, the side chain portion (Y) has an aliphatic polyester structure and has an ester group concentration of a polyester segment of 6.5 mmol/g or less, and the side chain portion (Z) has an organic polysiloxane structure and has an average number of Si&#x2014;O bond repeating units of a siloxane segment of 2 or more and 100 or less.

Provided is a toner that is excellent in terms of low-temperature fixability and hot offset resistance, has a wide fixing temperature range from a low-temperature region to a high-temperature region, and has high thermal storability. When the toner is measured with a capillary rheometer,

Toner and method for producing toner

The present invention provides a toner excellent in low-temperature fixability and also excellent in heat-resistant storage property, offset resistance, and durability. In a process for producing a toner containing toner particles by emulsion aggregation, each toner particle includes a binder resin of which a main component is a block polymer having a crystal structure, a colorant, and a release agent; the binder resin includes polyester as a main component; the rate of a portion capable of forming a crystal structure to the binder resin is 50 to 80 mass %; a peak temperature Tp of a maximum endothermic peak attributed to the binder resin is 50 to 80&#xb0; C. in endothermic amount measurement of the toner with a differential scanning calorimeter (DSC); and fused particles are heated at a heating temperature t (&#xb0; C.) satisfying Tp'&#x2212;15.0&#x2266;t&#x2266;Tp&#x2032;&#x2212;5.0 for at least 0.5 hr.

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Numazu, Japan

Takashige Kasuya