Canon Kabushiki Kaisha

Other

Matsushita Electric Industrial Co., Ltd.

Tetsuya Ida

Takeshi Yamamoto

Yojiro Hotta

Wakashi Iida

Naoki Okamoto

Kazuo Terauchi

Nozomu Komatsu

Masaaki Taya

Noriyoshi Umeda

Takayuki Itakura

Tsuyoshi Takiguchi

Makoto Kanbayashi

Kosuke Fukudome

Shuhei Moribe

Satoshi Mita

Yoshinobu Baba

Koh Ishigami

Kenji Okado

Yasuhiro Ichikawa

Hirohide Tanikawa

Kazuhiko Hayami

Ryoichi Fujita

Akira Hashimoto

Kunihiko Nakamura

Nobuyoshi Sugahara

Manami Haraguchi

Kenta Kubo

Yoshiaki Shiotari

Hiroyuki Fujikawa

Takaaki Kohtaki

Takuya Imaoka

Takakuni Kobori

Kazunori Kato

Shinya Yachi

Takeshi Naka

Ryuichiro Matsuo

Kohji Inaba

Jouji Wada

Tetsurou Kajino

Takeshi Ootsu

Takashi Kusakari

Junko Inaba

A toner contains toner particles. The toner particles are made of a resin containing an amorphous polyester resin, a releasing agent, an additive and a coloring agent. The additive has a polyester portion and a crystalline acrylic portion that are chemically bound to each other.

Toner and two-component developer

Provided is a toner has toner particle containing a crystalline polyester resin A, an amorphous resin B and a colorant, wherein (1) the crystalline polyester resin A is a resin that has a crystal nucleating agent segment (D) on the end of a polyester molecular chain (C), (2) the amorphous resin (B) is a hybrid resin in which a polyester unit (E) and a vinyl polymer unit (F) are chemically bonded, and (3) the SP value of the polyester molecular chain (C) (Sc), the SP value of the crystal nucleating agent segment (D) (Sd), the SP value of the polyester unit (E) (Se) and the SP value of the vinyl polymer unit (F) (Sf) satisfy specific relationships.

Toner

Provided is a toner having excellent long-term storage stability and exhibiting both low-temperature fixability and uniform gloss in high-speed printing. A toner has a toner particle that contains a crystalline polyester resin A, an amorphous polyester resin B and a colorant, wherein the crystalline polyester resin A has a polyester molecular chain having a nucleating agent segment at the terminal end thereof, and an SP value Sa ((cal/cm)) of the crystalline polyester resin A ranges from 9.00 to 11.50, and the amorphous polyester resin B has a specific functional group.

The toner includes toner particles containing a polyester resin A, a polyester resin B and a colorant, the polyester resin A has a polyester portion including a segment capable of forming a crystal structure and a crystal nucleating agent segment, which is bonded to an end of the polyester portion, and the polyester resin B is a resin which is free of any segments capable of forming a crystal structure, the polyester resin B has a weight average molecular weight Mwb by GPC of a THF soluble matter of 3000 or more and 100000 or less, and an SP value Sa ((cal/cm)) of the polyester portion of the polyester resin A and an SP value Sb ((cal/cm)) of the polyester resin B satisfy the following relationships:9.00&#x2266;&#x2266;10.50&#x2212;0.40&#x2266;&#x2266;0.80.

The toner of the present invention includes toner particles containing polyester resins A and B and a colorant, the A has a polyester portion including a portion capable of forming a crystal structure and a crystal nucleating agent portion, which is bonded to an end of the polyester portion, the B is free from any portions capable of forming a crystal structure, in a chart obtained as a result of GPC of a THF-soluble matter of the B, a ratio of a component having a molecular weight of 1500 or less in the B is 5.0 to 15.0% by area, and when an SP value of the polyester portion of the A is represented by Sa ((cal/cm)) and an SP value of the B is represented by Sb ((cal/cm)), the SP values Sa and Sb satisfy the following relationships:9.50&#x2266;Sa&#x2266;11.00&#x2212;0.65&#x2266;&#x2266;0.70.

Provided is a toner exhibiting satisfactory fixability even in high-speed fixing process involving a double-sided printing mechanism, keeping stable toner image even after a conveyance step, and doesn't cause curling to a fixing roller even in thin paper. In a toner including toner particles, each of which contains polyester resins A and B, a coloring agent, and a resin composition C, the resin A includes a crystal nucleating agent bonded to a polyester molecular chain including a moiety capable of forming a crystalline structure. The resin B doesn't include a moiety capable of forming a crystalline structure. The composition C is obtained by copolymerizing a vinyl-based resin component with a polyolefin resin component. SP values the resin A, the resin B, the agent, the polyolefin component, and the vinyl-based component satisfy the particular relationships.

Provided is the following magnetic carrier. The magnetic carrier maintains high developing performance even when the number of sheets to be output is large. Its charge-providing performance hardly reduces even when toner or an external additive is spent on the magnetic carrier. In addition, the magnetic carrier is strong in resistance against standing. The magnetic carrier includes a magnetic carrier core and a resinous coating layer formed on a surface of the magnetic carrier core, in which the resinous coating layer contains a resin composition and silica-alumina composite particles.

Magnetic carrier

Provided is a toner satisfying low-temperature fixing performance and long-term storage stability of fixed images. Further, provided is a toner capable of obtaining toner images excellent in long-term storage stability irrespective of use environments even in the case where images are formed by a high-speed fixing system having low internal pressure of a fixing nip of a fixing device and a high printing speed. The toner includes toner particles containing a binder resin having a resin A and B, and a coloring agent, in which the resin A includes a resin including a moiety capable of forming a crystalline structure; the resin B includes a resin free of a moiety capable of forming a crystalline structure; and &#x394;Hand &#x394;Hsatisfy the expressions:2&#x2266;&#x394;H&#x2266;453[%]&#x2266;{(&#x394;)/&#x394;}&#xd7;100&#x2266;70[%]where &#x394;Hand &#x394;Hrepresent a heat of melting derived from the binder resin measured at a temperature increase speed of 100&#xb0; C./min and 10&#xb0; C./min, respectively.

A two-component developer containing a yellow toner and a magnetic carrier, wherein the yellow toner has the characteristics: (i) when the concentration of the yellow toner in a solution of the yellow toner in chloroform is represented by Cy (mg/ml) and the absorbance of the solution at a wavelength of 422 nm is represented by A422, a relationship between Cy and A422 satisfies the relationship of 6.00&#x3c;A422/Cy&#x3c;14.40; (ii) the lightness L* and chroma C* of the yellow toner determined in a powder state satisfy the relationships of 85.0&#x2266;L*&#x2266;95.0 and 100.0&#x2266;C*&#x2266;115.0; and (iii) the absolute value for the triboelectric charge quantity of the yellow toner measured by a two-component method using the yellow toner and the magnetic carrier is 50 mC/kg or more and 120 mC/kg or less.

Two-component developer, replenishing developer, and image-forming method

A two-component developer containing a cyan toner and a magnetic carrier, wherein the cyan toner has the characteristics: (i) when the concentration of the cyan toner in a solution of the cyan toner in chloroform is represented by Cc (mg/ml) and the absorbance of the solution at a wavelength of 712 nm is represented by A712, a relationship between Cc and A712 satisfies the relationship of 2.00&#x3c;A712/Cc&#x3c;8.15; (ii) the lightness L* and chroma C* of the cyan toner determined in a powder state satisfy the relationships of 25.0&#x2266;L*&#x2266;40.0 and 50.0&#x2266;C*&#x2266;60.0; and (iii) the absolute value for the triboelectric charge quantity of the cyan toner measured by a two-component method using the cyan toner and the magnetic carrier is 50 mC/kg or more and 120 mC/kg or less.

A two-component developer containing a magenta toner and a magnetic carrier, wherein the magenta toner has the characteristics: (i) when the concentration of the magenta toner in a solution of the magenta toner in chloroform is represented by Cm (mg/ml) and the absorbance of the solution at a wavelength of 538 nm is represented by A538, a relationship between Cm and A538 satisfies the relationship of 2.00&#x3c;A538/Cm&#x3c;6.55; (ii) the lightness L* and chroma C* of the magenta toner determined in a powder state satisfy the relationships of 35&#x2266;L*&#x2266;45 and 60&#x2266;C*&#x2266;72; and (iii) the absolute value for the triboelectric charge quantity of the magenta toner measured by a two-component method using the magenta toner and the magnetic carrier is 50 mC/kg or more and 120 mC/kg or less.

An object of the present invention is to provide a toner which: is excellent in fixing ability such as low-temperature fixability, hot offset property, and separability even in a fixing system excellent in quick start property and energy saving property; has high gloss; and is excellent in development stability and transferability irrespective of environments. The toner of the present invention includes toner particles each containing at least a binder resin and a colorant, in which, in a case where a tetrahydrofuran (THF) insoluble matter of the binder resin in the toner when the toner is subjected to Soxhlet extraction with THF for 2 hours is represented by A (mass %), a THF insoluble matter of the binder resin in the toner when the toner is subjected to Soxhlet extraction with THF for 4 hours is represented by B (mass %), a THF insoluble matter of the binder resin in the toner when the toner is subjected to Soxhlet extraction with THF for 8 hours is represented by C (mass %), and a THF insoluble matter of the binder resin in the toner when the toner is subjected to Soxhlet extraction with THF for 16 hours is represented by D (mass %), A, B, C, and D satisfy the following expression: (A&#x2212;B)/2&#x3e;(B&#x2212;C)/4&#x3e;(C&#x2212;D)/8 where 40&#x3c;A&#x2266;75 (mass %) and 1.0&#x3c;D&#x3c;40 (mass %).

Provided a toner including at least: toner particles each containing at least a binder resin, a release agent, and a colorant; and an inorganic fine powder, in which: a degree of aggregation Yat a time of compression (200 kpa) of the toner satisfies a relationship of 15&#x2266;Y&#x2266;35, and a degree of aggregation Yat a time of non-compression of the toner satisfies a relationship of 7&#x2266;Y&#x2266;15; and a highest endothermic peak of the toner is present in a temperature range of 30 to 200&#xb0; C. in an endothermic curve measured with a differential scanning calorimeter (DSC), and a peak temperature Tsc (&#xb0; C.) of the highest endothermic peak satisfies a relationship of 60&#x2266;Tsc&#x2266;130.

Toner and image forming method

The present invention provides a yellow toner which is excellent in transparency of an image formed on an OHP sheet, excellent in color reproducibility even when a light-pressure fixing unit is employed, excellent in coloring power and charge property, and is reduced in occurrence of filming. The present invention also provides a yellow toner having excellent durability and capable of contributing to the simplification or miniaturization of the constitution of an image forming apparatus. The yellow toner of the invention comprises a binder resin and a colorant, the binder resin contains at least a polyester unit, and the toner in the powder state has a lightness L* satisfying the relationship of L*&#x3e;87 and has a chromaticity b* satisfying the relationship of 106&#x3c;b*&#x3c;120.

Yellow toner, image forming apparatus and a method for producing a toner

In a carrier comprising carrier particles; each carrier particle comprising a carrier core and a coat layer for coating the carrier core, the carrier core has a ferrite component containing i) a metal oxide having at least one of metallic elements Mg, Li and Ca, the total-sum content of which is 10 to 40 mole % based on the whole ferrite component, and ii) a metal oxide having at least one of metallic elements Mn, Cu, Cr and Zn, the total-sum content of which is 50 to 4,000 ppm based on the whole ferrite component. The carrier has a volume distribution based 50% particle diameter (D50) of from 15.0 to 55.0 &#x3bc;m and a degree of surface unevenness of from 1.05 to 1.30, and the coat layer contains particles; the particles having a number-average primary particle diameter of from 10 to 500 nm.

Growing community of inventors

Mishima, Japan

Tetsuya Ida