Canon Kabushiki Kaisha

Takeshi Kaburagi

Keiji Komoto

Kenichi Nakayama

Yasushi Katsuta

Michihisa Magome

Yushi Mikuriya

Tatsuhiko Chiba

Shinya Yachi

Emi Tosaka

Eriko Yanase

Akira Hashimoto

Kazumi Yoshizaki

Yuji Moriki

Tsuyoshi Takiguchi

Hideki Kaneko

Shiro Kuroki

Shohei Shibahara

Tatsuya Nakamura

Yoshihiro Nakagawa

Masatake Tanaka

Tsutomu Shimano

Kenta Kamikura

Naoya Isono

Yu Yoshida

Yasuhiro Hashimoto

Noriyoshi Umeda

Naotaka Ikeda

Kaori Hiratsuka

Shintaro Noji

Shota Amano

Hirofumi Kyuushima

Shintaro Kawaguchi

Nobuhisa Abe

Yoshiaki Wada

A toner comprising: a toner particle that includes a binder resin, and an external additive, wherein the toner particle includes a polyester resin on the surface; the toner particle includes a polyvalent metal element; where an electrical resistivity of the polyvalent metal element at 20&#xb0; C. is denoted by A &#x3a9;&#xb7;m, and an amount of the polyvalent metal element in the toner particle is denoted by B &#x3bc;mol/g, a following relationship is satisfied:0.025&#xd7;10&#x2264;(1/)&#xd7;&#x2264;4.500&#xd7;10;

Toner and method for producing toner

Provided is a toner for which the heat-resistant storability and the low-temperature fixability are able to co-exist at higher levels and for which the temporal stability of the low-temperature fixability is also excellent. The toner has a toner particle that contains a binder resin and a pigment, and this binder resin contains a polyester resin that has a specific structure and specific properties.

Toner

The toner has a toner particle that contains a binder resin and a wax, wherein the wax is present in domain form in the interior of the toner particle; the proportion of toner particles for which the position of the wax domains are controlled, is in a prescribed range; using d for a major axis length of the domain having the largest major axis length and using D for a number-average particle diameter of the toner, the d and D satisfy a prescribed relationship; and the ratio between the major axis length and the minor axis length of the domain having the largest major axis length is in a prescribed range.

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.

The present invention provides a toner showing an excellent fixing property even in high-speed image formation and inhibiting contamination of the inside of an apparatus and thereby being capable of stably forming high-quality images not having unevenness of gloss over a long period of time. In the toner including toner particles containing a binder resin, an ester wax, and a coloring agent, the ester wax is prescribed by, in GC/MS analysis of components volatilized by heating the wax at 200&#xb0; C. for 10 minutes, a relationship in the components having carbon atoms in specific ranges.

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

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

The present invention provides a magnetic toner which is hardly influenced by an environment, and with which an image with high quality and excellent resolution can be stably even under low humidity. In the magnetic toner of present invention:

Magnetic toner and method of manufacturing magnetic 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

A toner includes toner particles and an inorganic fine powder mixed with the toner particles. The toner particles contain a binder resin, a coloring agent, a releasing agent, and a sulfur-containing resin. The toner particles contain at least one element selected from the group consisting of magnesium, calcium, barium, zinc, aluminum, and phosphorus and satisfy the relationship:4&#x2266;&#x2266;30wherein T represents the total content of the element in ppm, and S represents the content of sulfur in ppm. The weight-average particle diameter (D) of the toner is in the range of 3 to 10 &#x3bc;m. The average circularity of the toner is within the range of 0.950 to 0.995.

In a process for producing toner particles by dispersing in an aqueous medium a polymerizable monomer composition containing at least a polymerizable monomer and a colorant and carrying out polymerization by the use of a polymerization initiator, the concentration of alcohol having 4 to 6 carbon atoms in the aqueous medium is so adjusted as to be from 500 ppm to 2,000 ppm when the polymerization conversion of the polymerizable monomer composition is 30%, and to be from 2,300 ppm to 10,000 ppm when the polymerization conversion of the polymerizable monomer composition is 97%.

Process for producing toner particles, and toner

In a non-magnetic toner having non-magnetic toner particles containing at least a binder resin and a colorant, and an inorganic fine powder, the non-magnetic toner particles contain at least one ether compound having a specific structure, and the ether compound is in a content of from 5 ppm to 1,000 ppm.

Growing community of inventors

Suntou-gun, Japan

Takeshi Kaburagi