Canon Kabushiki Kaisha

Masayoshi Kato

Hitoshi Kanda

Takayuki Toyoda

Hiroshi Yusa

Satoshi Mitsumura

Takeshi Miyazaki

Atsushi Nakamoto

Koichi Tomiyama

Makoto Fukatsu

Takeshi Yamamoto

Yasuaki Murai

Tsutomu Kukimoto

Takahiro Kawamoto

Kiyoko Tsuchiya

Yusuke Yamada

Manabu Ohno

Kazuhisa Kemmochi

Akihiko Nakazawa

Takaho Shibata

Shunji Suzuki

Yasuhide Goseki

Manami Haraguchi

Nobuyuki Okubo

Yuya Chimoto

Hiroyuki Suematsu

Tatsuya Nakamura

Yasunori Chigono

Ryuji Higashi

Kazuyuki Sato

Yoshinori Tsuji

Norikazu Fujimoto

Ryo Natori

Yoko Goka

Masao Suzuki

Hayato Ida

Masashi Hirose

Takakuni Kobori

Masatake Tanaka

Kazunari Hagiwara

Kei Inoue

Takashi Hirasa

Shuichi Aita

Toshiaki Sasaki

Shuhei Tokiwa

Maki Okajima

Koji Inaba

Kengo Hayase

Yuki Nishio

Shohei Fukuya

Kohichi Tomiyama

A toner comprising a toner particle that contains a binder resin, wherein the surface of the toner particle is covered with a resin A; the modulus of elasticity Ea of the resin A and the modulus of elasticity Eb of the binder resin satisfy the following formula:0.5&#x2264;()&#xd7;100&#x2264;50.0; andthe adhesion force Aof the toner particle is at least 500 nN when a probe having spherical SiOattached at the tip of a cantilever is pressed into the toner particle at 3 &#x3bc;N.

Toner

A toner according to the present disclosure maintains high transfer efficiency for the long term and obtains images which are not affected by toner base particles easily, which exhibit excellent charge stability, and which exhibit less fogging, wherein the toner is obtained by making inorganic fine particles and charge control particles, which satisfy specific conditions, present on the surfaces of toner base particles so as to satisfy a specific coverage relationship.

There is provided a toner including toner base particles and an external additive in which the external additive is prevented from being buried in the base particles. The toner can maintain a high transfer efficiency over an extended period of use. The toner includes: (1) toner base particles containing a cycloolefin copolymer and a polyethylene; or (2) toner base particles whose surfaces contain a resin having an elastic deformation rate of 70% or more and a melting temperature of 125.0&#xb0; C. or less.

A developing device includes: a developing container for accommodating developer, a developer carrying member, and a plate-like elastic member. In a state in which the elastic member contacts the developer carrying member without being deformed, an angle formed between a flat reference surface passing through a surface of the elastic member which is continuous to a contact portion of the elastic member with the developer carrying member and which is downstream of the contact portion with respect to the movement direction and a tangent plane of the developer carrying member and a contact position between the elastic member and the developer carrying member is 10&#xb0; or more and 45&#xb0; or less, and the elastic member includes a first region including the contact portion and a second region which is provided continuously from the first region toward the supporting portion and which is lower in rigidity than the first region.

Developing device, process cartridge and image forming apparatus

The method for manufacturing core-shell structure fine particles, includes adding metal salt into an aqueous medium containing shell particles A and core particles B to thereby attach the shell particles A to the surface of each of the core particles B and the toner contains the core-shell structure fine particles.

Method for manufacturing core-shell structure fine particles and toner

A process for producing a core-shell toner is provided in which the toner has core particles containing at least a binder resin (), a colorant and a release agent and shell layers which contain at least a resin () and with which the core particles are covered; and the process including the steps of (A) mixing a binder resin-() dispersion, a colorant dispersion and a release agent dispersion, (B) adding to a mixed dispersion thus obtained an agglomerating agent to effect agglomeration, (C) adding to core agglomerated particles thus formed a mixture prepared by mixing the resin-() dispersion and a metal salt to make the resin () adhere to the surfaces of the core agglomerated particles, and (D) heating core-shell agglomerated particles thus formed to a temperature not lower than the glass transition temperatures of the binder resin () and resin () to effect fusion thereof.

Toner production process and toner

A coloring compound is provided which is excellent in coloring ability and transparency, has high solubility in organic solvents, and is superior in light resistance. A toner, a sheet for heat-sensitive transfer recording and an ink that use the coloring compound are also provided. The coloring compound is represented by the following general formula: 

Coloring compound, yellow toner, sheet for heat-sensitive transfer recording, and ink

The present invention provides an aqueous dispersion of nonspherical fine resin particles having excellent storage stability and processability such as aggregation and adherence to other substances, a method for producing the aqueous dispersion of fine resin particles, and a method for producing toner particles using the aqueous dispersion of fine resin particles. The present invention relates to an aqueous dispersion of fine resin particles characterized in that the fine resin particles are nonspherical particles with an average minor axis being 0.02 &#x3bc;m or more and 1.00 &#x3bc;m or less and an average ratio of a major axis to a minor axis being 2.0 or more and 5.0 or less, a method for producing the aqueous dispersion of fine resin particles, and a method for producing toner particles using the aqueous dispersion of fine resin particles.

Aqueous dispersion of fine resin particles, method for producing aqueous dispersion of fine resin particles, and method for producing toner particles

Provided are a coloring compound for color toner which satisfies all of solubility in an organic solvent, a color tone, and lightfastness, and does not inhibit the polymerization of a polymerizable monomer when used in a polymerized toner, and a yellow toner using the coloring compound and achieving compatibility between a good color tone and excellent lightfastness, in which, the coloring compound has a structure represented by the following formula (1). 

Coloring compound and yellow toner containing the coloring compound

A cyan toner is provided which is brighter and more greenish in hue than conventional cyan toners and highly translucency. A cyan toner characterized by comprising toner particles at least having a coloring compound represented by the Formula (1): 

Cyan toner and method of producing cyan toner

A process for producing a toner has the steps of, polymerizing a polymerizable monomer composition containing at least a polymerizable monomer and a colorant, in an aqueous dispersion medium to form colored polymer particles, and thereafter washing the colored polymer particles, followed by dewatering to prepare wet colored polymer particles, subjecting the resultant wet colored polymer particles to substantial removal of the water held by the wet colored polymer particles, by means of a dryer making use of hot air to obtain toner particles, and drying the toner particles under reduced pressure by means of a vacuum dryer so that polymerizable monomers remaining in the toner particles come to be in a residue of 200 ppm or less.

Process for producing toner

A gas current classifier has a material feed nozzle, a Coanda block, a classifying wedge and a classifying wedge block having the classifying wedge. The Coanda block and the classifying wedge define a classification zone, and the classifying wedge block is set up in the manner that its location is changeable so that the form of the classification zone can be changed.

Gas current classifier and process for producing toner

The present invention relates a toner for developing electrostatic images, comprising: a resin composition, which contains a binder resin and low molecular weight wax, and a coloring agent, wherein the binder resin does not substantially contain insoluble tetrahydrofuran (THF) component, its chromatograph measured with soluble tetrahydrofuran (THF) component has a main peak in a region of a molecular weight of 2,000 to 30,000 and a subpeak or a shoulder in a high molecular weight region of a molecular weight of 100,000 or more, a ratio of weight average molecular weight (Mw)/number average molecular weight (Mn) thereof is 30 or more, the high molecular weight region has a crosslinking monomer unit as a component monomer unit and the binder resin contains high molecular weight polymer having a Mw of 1,200,000 or more polymerized by using both polyfunctional initiator and a mono-functional initiator. Moreover, the present invention relates to a method of manufacturing a resin composition for producing a toner.

Toner for developing electrostatic image and method of manufacturing

Growing community of inventors

Iruma, Japan

Masayoshi Kato