Canon Kabushiki Kaisha

Shinya Yachi

Yushi Mikuriya

Kazumi Yoshizaki

Katsuyuki Nonaka

Kenichi Nakayama

Takeshi Kaburagi

Emi Tosaka

Tatsuya Nakamura

Koji Abe

Satoshi Handa

Yuji Moriki

Kenji Okado

Shuntaro Watanabe

Ryoichi Fujita

Hiroaki Kawakami

Yasuhiro Hashimoto

Nobuhisa Abe

Michihisa Magome

Kazunori Kato

Yasushi Katsuta

Koji Inaba

Shiro Kuroki

Tatsuhiko Chiba

Masaki Uchiyama

Keiji Komoto

Naotaka Ikeda

Kohji Inaba

Takeshi Yamamoto

Kazuo Yoshinaga

Yoshihiro Nakagawa

Wakashi Iida

Tsuyoshi Takiguchi

Manabu Ohno

Makoto Kanbayashi

Kenta Kamikura

Hitoshi Itabashi

Tetsuya Ida

Masaaki Taya

Satoshi Yasuda

Koichi Tomiyama

Toshiyuki Ugai

Hideki Kaneko

Emi Watanabe

The present invention provides a toner that gives satisfactory fixing image quality in both high-speed fixing process and low-speed fixing process and shows excellent image quality for a long time by inhibiting inside contamination even in repeated use. In a toner including toner particles containing a binder resin, a hydrocarbon wax, and a coloring agent, the hydrocarbon wax is prescribed by a relationship in total amounts of components having carbon atoms in specific ranges in thermal desorption and GC/MS analysis when heated at 200&#xb0; C. for 10 minutes.

Toner

A toner is provided which has toner particles and an inorganic fine powder; the toner particles being obtained by suspension polymerization using a specific polar resin. The toner is a toner in which; where, in displacement levels found in a micro-compression test in which a force is applied to a toner single particle at a loading rate of 9.8&#xd7;10N/sec to measure a displacement level (&#x3bc;m) at a point of time where the force has reached a maximum force of 4.90&#xd7;10N, the displacement level of the toner at a measurement temperature of 25&#xb0; C. is represented by X(25) and the displacement level of the toner at a measurement temperature of 50&#xb0; C. by X(50), and the number average particle diameter of the toner is represented by D (&#x3bc;m), the X(25), X(50) and D satisfies the relations:0.10&#x2266;(25)/&#x2266;0.35&#x2003;&#x2003;(1)30&#x2266;[(50)&#x2212;(25)]/(25)&#xd7;100&#x2266;150&#x2003;&#x2003;(2).

Toner and process for producing toner

To provide a toner having a superior developing performance while preventing any fixing assembly from being contaminated, the toner has toner particles which have toner base particles containing at least a binder resin, a colorant and a wax, and an inorganic fine powder, wherein the wax has a 0.2% by mass heating loss temperature of 200&#xb0; C. or more and a 1.0% by mass heating loss temperature of 250&#xb0; C. or more and has a melt viscosity at 120&#xb0; C. of from 3.0 mPa&#xb7;s to 15.0 mPa&#xb7;s.

A toner includes toner particles each containing a binder resin, a colorant, and a carboxy-containing styrene-based resin, in which the toner particles are produced in an aqueous medium, each of the toner particles has a styrene-acrylic-based resin component content of 50.0% by mass or more, cyclohexane-insoluble matter A obtained by subjecting the toner to Soxhlet extraction with cyclohexane for 4 hours is 70.0% by mass or more, and cyclohexane-insoluble matter B obtained by subjecting the toner to Soxhlet extraction with cyclohexane for 24 hours is 40.0% by mass or less, and wherein when the z-average molecular weight and the weight-average molecular weight of tetrahydrofuran-soluble matter of the carboxy-containing styrene-based resin determined by gel permeation chromatography measurement are represented by Mz and Mw, respectively, Mz and Mw satisfy the following expressions:

A toner includes a toner particle, which contains at least a binding resin, a colorant, and two types of polar resins, i.e., a polar resin H and a polar resin L, and which is obtained with granulation in a water-based medium, wherein solubility parameters, glass transition points, and weight-average molecular weights of the binding resin, the polar resin H, and the polar resin L, as well as amounts of the added resins satisfy respective specific relationships.

Toner and toner particle producing method

A toner including toner particles containing at least a binder resin and a colorant. The binder resin is a vinyl-based resin. The toner contains a THF insoluble matter in a quantity of 0.0 mass % or more to less than 16.0 mass %. The toner has a main peak in a molecular weight domain Drranging from 5,000 to 80,000 in measurement of THF soluble matter of the toner with a gel permeation chromatogram (GPC)-differential refractive index detector (RI), and the toner has a main peak in a molecular weight domain Dmranging from 10,000 to 120,000 and at least one peak in a molecular weight domain Dmranging from 300,000 to 7,000,000 in the GPC-RI measurement in measurement with a GPC-multi-angle laser light scattering detector (MALLS).

A non magnetic toner comprises toner particles each containing at least a binder resin, a colorant and a wax component. The toner further comprises an inorganic fine powder. A storage elastic modulus at 110&#xb0; C. (G') of the non magnetic toner is in a range of 2.00&#xd7;10to 2.00&#xd7;10dN/m. A storage elastic modulus at 150&#xb0; C. (G&#x2032;) of the non magnetic toner is in a range of 3.00&#xd7;10to 2.00&#xd7;10dN/m. The toner particles are obtained by dispersing a polymerizable monomer composition containing polymerizable monomers, the colorant, the wax component and a low-molecular weight polymer into an aqueous medium, granulating the dispersed polymerizable monomer composition, and polymerizing the polymerizable monomers in granulated particles. The low-molecular weight polymer has a weight average molecular weight (Mw) measured by means of gel permeation chromatography (GPC) in a range of 2000 to 5000.

Non-magnetic toner

In a chart of molecular weight distribution measured of a toner, i) the toner has a main peak in the region of molecular weight of 16,000 to 60,000, and ii) where the molecular weight at the main peak is represented by M1, and where the height at the molecular weight M1 is represented by H(M1), the height at a molecular weight of 4,000 by H(4000) and the height at a molecular weight of 15,000 by H(15000), the H(4000), the H(15000) and the H(M1) satisfy a specific proportion. The toner has a weight-average molecular weight (Mw) of 15,000 to 80,000, and, in an endothermic chart, i) the toner has an endothermic main peak in the range of 40 to 130&#xb0; C., and ii) the calorimetric integral value represented by the peak area of the endothermic main peak is 10 to 35 J per 1 g of the toner.

Toner, and toner production process

A toner is provided which has toner particles and a fine silica powder mixed by external addition to the toner particles. The toner has a weight average particle diameter of 4.0 to 9.0 &#x3bc;m. The fine silica powder is subjected to hydrophobic treatment with dimethylsilicone oil, and has, in particle size distribution based on volume, a peak at which cumulative frequency is largest, in the measurement range of 0.02 &#x3bc;m to 1,000.00 &#x3bc;m; the cumulative frequency of 0.10 &#x3bc;m to less than 1.00 &#x3bc;m being 7.0% or less, and, the fine silica powder fulfills the following conditions:

Toner and image forming method

A toner is provided which is excellent in low-temperature fixability and offset resistance, has a wide fixing temperature range, provides fixed images with high gloss, and can form toner images having high quality. The toner is composed of toner particles having toner base particles each containing a binder resin and a colorant. When the viscosities of each of the toner particles measured at 100&#xb0; C. and 110&#xb0; C. by a flow tester heat-up method are represented by &#x3b7;(Pa&#xb7;s) and &#x3b7;(Pa&#xb7;s), respectively, an average variation in viscosity Arepresented by the following equation (1) satisfies the relationship of 0&#x2267;A&#x2267;&#x2212;0.064:=(log(&#x3b7;)&#x2212;log(&#x3b7;)/(110&#x2212;100); and&#x2003;&#x2003;(1)

Toner and method of producing toner

A toner includes toner particles containing at least a binder resin and a colorant, and inorganic fine particles. The shape factor SF-1 of the toner particles is in a specific range. The toner has a storage elastic modulus at 140&#xb0; C., G' (140&#xb0; C.), in a specific range the toner comes to have a viscosity of 1.0&#xd7;10Pa&#xb7;s according to a flow tester heating method at a temperature of from 115&#xb0; C. or more to less than 130&#xb0; C.

Toner, and image forming method

In a toner kit having i) a non-magnetic black toner having at least carbon black and ii) color toners, the black toner has a weight-average particle diameter represented by Dand a one-point method BET specific surface area represented by Sb, and the color toners, other than the-black toner, each have a weight-average particle diameter represented by D4and a one-point method BET specific surface area represented by Sc, where the black toner and color toners satisfy the following relations (1) and (2):0.60&#x2266;4.4&#x2266;0.96,:&#x2003;&#x2003;Relation (1)0.750&#x2266;&#x2266;1.000;:&#x2003;&#x2003;Relation (2)and each have an average circularity of from 0.950 to 1.000 and a circularity standard deviation of less than 0.040 as measured with a flow type particle image analyzer.

Toner kit and color-image-forming method

To provide an method for forming an image capable of effectively suppressing a toner from deteriorating and also capable of keeping the quality of an image for a long period of time, even when the method is applied to an apparatus with as high process speed. The prevent invention provides an method for forming an image, in which a developing unit is used, which includes: a rotatable cylindrical toner bearing member having a diameter represented as Rd (mm); and a rotatable cylindrical toner-supplying member having a diameter Rs (mm), the diameters Rd and Rs satisfying the following relational expression ():1&#x2266;Rs&#x2212;Rd&#x2266;10&#x2003;&#x2003;(1) and in which the nonmagnetic one-component toner having an degree of aggregation of 5 to 30% and an electric resistivity of 1&#xd7;10to 1&#xd7;10&#x3a9;&#xb7;cm at an electric field of 1&#xd7;10V/cm is used.

Method for forming an image

In a toner kit having i) a non-magnetic black toner having at least carbon black and ii) color toners, the black toner has a weight-average particle diameter represented by Dand a one-point method BET specific surface area represented by Sb, and the color toners, other than the black toner, each have a weight-average particle diameter represented by Dand a one-point method BET specific surface area represented by Sc, where the black toner and color toners satisfy the following relations (1) and (2):0.60&#x2266;&#x2266;0.96,&#x2003;&#x2003;Relation (1)0.750&#x2266;&#x2266;1.000;&#x2003;&#x2003;Relation (2)and each have an average circularity of from 0.950 to 1.000 and a circularity standard deviation of less than 0.040 as measured with a flow type particle image analyzer.

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Mishima, Japan

Shinya Yachi