Canon Kabushiki Kaisha

Takaaki Kaya

Atsushi Tani

Takashige Kasuya

Kenji Aoki

Shuntaro Watanabe

Tetsuya Kinumatsu

Toshifumi Mori

Yusuke Kosaki

Shigeto Tamura

Ayako Okamoto

Masaya Kawada

Takaaki Kotaki

Takayuki Itakura

Yoshihiro Nakagawa

Ryoichi Fujita

Tetsuya Karaki

Noritaka Toyoizumi

Ayako Sekikawa

Makoto Kambayashi

Wakashi Iida

Nozomu Komatsu

Yuji Nakayama

Kazuhiko Hayami

Makoto Kanbayashi

Toshiyuki Ehara

Katsumi Kondo

Koji Yamazaki

Yojiro Hotta

Nobuyoshi Sugahara

Yasuhiro Ichikawa

Kazumichi Nakahama

Hironori Owaki

Shinnosuke Koji

Takeshi Ikeda

Yoshinobu Baba

Hiroyuki Fujikawa

Yushi Mikuriya

Yasukazu Ayaki

Kazuo Terauchi

Hironori Ohwaki

Yayoi Tazawa

Yuichi Yajima

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.

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.

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).

Method of producing toner and method of producing resin particle

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.

In a toner formed of toner particles which include a colorant, a wax, and a binder resin containing a crystalline resin (a) primarily composed of a polyester, the crystalline resin has an endothermic peak temperature (Tp) in a range of 50&#xb0; C. to 80&#xb0; C., and in a viscoelasticity measurement of the toner, G&#x2033;(Tp&#x2212;10) is in a range of 5.0&#xd7;10to 5.0&#xd7;10Pa, G&#x2033;(Tp+10) is in a range of 5.0&#xd7;10to 5.0&#xd7;10Pa, and G&#x2033;(Tp&#x2212;20), G&#x2033;(Tp&#x2212;10), G&#x2033;(Tp+10), and G&#x2033;(Tp+30) satisfy specific relationships.

Provided is a toner comprising toner particles, wherein each of the toner particles has a core-shell structure composed of a core and a shell phase formed on the core, the shell phase contains a resin (B), and the core contains a binder resin (A), a colorant and a wax, wherein the toner particles contain the resin (B) in a specific amount with respect to the core, and wherein the solubility parameter (SP value) of the binder resin (A) is denoted by SP(A), the SP value of the resin (B) is denoted by SP(B), the SP value of a repeating unit with the smallest SP value from among repeating units constituting the resin (B) is denoted by SP(C), and the SP value of the wax is denoted by SP(W), each of the SP(A), SP(B), SP(C) and SP(W) satisfy specific relationships.

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Suntou-gun, Japan

Takaaki Kaya