Ricoh Company, Ltd.

Minolta Company, Ltd.

Meiji Seika Kaisha, Ltd.

Mitsuyo Matsumoto

Tsuyoshi Nozaki

Atsushi Yamamoto

Chiyoshi Nozaki

Katsunori Kurose

Takuya Kadota

Yoshimichi Ishikawa

Hiroyuki Murakami

Hideaki Ueda

Masahide Inoue

Yoshitaka Sekiguchi

Akihito Hisamitsu

Natsuki Koike

Minoru Nakamura

Mitsutoshi Nakamura

Masakazu Okada

Yasushi Akiba

Nobuyuki Kobayashi

Masako Iwamatsu

Takeshi Kitahora

Kenji Nishiguchi

Fumie Motoori

Masayuki Takagi

Takao Shimizu

Tomoko Shomura

Shino Hirao

Katsuhito Uomoto

Susumu Kiriya

A resin composition is provided that comprises a resin and a phosphorus-based flame retardant. The resin includes a β-1,3-glucan derivative resin having a main chain having a structure represented by the following structural formula (1): where each of Rs is independently a hydrogen atom or an alkylcarbonyl group, at least one of Rs is an alkylcarbonyl group, and n is a natural number. The phosphorus-based flame retardant has an average particle diameter of 5 μm or less in the resin.

Resin composition, molded article, electronic component, and electronic device

A resin composition is provided. The resin composition comprises an acrylonitrile butadiene styrene resin, a polystyrene resin, a polycarbonate resin, and a phosphorus compound. The amount of the polystyrene resin is equal to or greater than the amount of the acrylonitrile butadiene styrene resin. The amount of the polycarbonate resin is from 70 to 90 parts by mass with respect to 100 parts by mass of all the resins. The phosphorus compound contains a phosphazene compound, and the amount of the phosphazene compound is from 0.1 to 4.0 parts by mass with respect to 100 parts by mass of all the resins.

Resin composition, molded body, electronic part, and electronic device

Disclosed is a non-magnetic toner for use in developing electrostatic toner image, wherein the toner is produced by a toner production method that includes: dispersing in an aqueous medium an organic dispersion liquid that comprises in an organic solvent a pigment, a binder resin and/or a binder resin precursor, and a releasing agent; removing the organic solvent to prepare a dispersion slurry in which toner particles are dispersed in the aqueous medium; heating the dispersion slurry to a temperature equal to or higher than the melting point of the releasing agent; and washing the toner particles.

Toner and method for producing the same, toner container, developer, image forming apparatus and process cartridge

A toner for developing a latent electrostatic image produced by suspension polymerizing a polymerizable monomer composition in an aqueous dispersion medium, wherein the polymerizable monomer composition contains a polymerizable monomer, a colorant, and a layered inorganic mineral in which at least a part of an interlayer ion is replaced with an organic ion, and a process cartridge and an image forming method using the toner.

Toner for developing latent electrostatic image, process cartridge and image forming method

A toner including toner particles comprising a binder resin, a coloring agent and a wax. The toner particles are prepared by agglomerating and/or fusing at least two kinds of resin particulates and particles of the coloring agent dispersed in an aqueous medium. A first resin particulate among the at least two kinds of resin particulates contains a resin having a polyester skeleton and the wax. At least 50% by weight of the binder resin is polyester resins.

Toner and method of manufacturing the same

A toner manufactured by a method including the steps of dissolving or dispersing toner components comprising a binder resin, a colorant, and an encapsulated plasticizer to prepare an oily toner components liquid, and emulsifying or dispersing the oily toner components liquid in an aqueous medium to prepare the toner.

Toner, developer, toner container, process cartridge, image forming apparatus, and image forming method

An image forming apparatus, wherein a surface resistivity Rse[&#x3a9;] of a charger and a volume resistivity Rsw [&#x3a9;&#xb7;cm] of the composition having a low softening point satisfy the following relationship:0.8&#xd7;101.5&#xd7;10is provided. The image forming apparatus contains a photoreceptor; a charger configured to charge the photoreceptor with a charger contacting thereto; an irradiator configured to irradiate the photoreceptor to form an electrostatic latent image thereon; an image developer configured to develop the electrostatic latent image with a toner to form a toner image on the photoreceptor; a transferer configured to transfer the toner image onto a recording material directly or through an intermediate transferer; and a fixer configured to fix the toner image on the recording material, wherein the toner comprises: a binder resin; a colorant; a composition having a low softening point; and an external additive.

Image forming method and apparatus

To provide a toner that contains at least a binder resin, a colorant, a releasing agent and zeolite, the toner being manufactured through O/W type wet granulation and having an average circularity of 0.970 or greater, and a developer and image forming method using the toner.

Toner, developer, toner container, process cartridge, image forming method, and image forming apparatus

To provide a toner for developing a latent electrostatic image comprising at least a colorant, a wax, and a binder resin, wherein Iwax (s) is a value measured by FTIR-ATR Spectroscopy before heating a mirror-surfaced pellet formed by compressing and molding the toner, and Iwax (t) is a value measured by FTIR-ATR Spectroscopy after heating the pellet at a surface temperature thereof of 130&#xb0; C. for 1 minute satisfy Formulae (1), (2), (3), and (4),wax ()&#x2267;0.2*100/[&#x2003;&#x2003;Formula (1)wax ()&#x2266;0.26&#x2003;&#x2003;Formula (2)wax ()&#x2266;0.50&#x2003;&#x2003;Formula (3)wax ()&#x3e;wax ()&#x2003;&#x2003;Formula (4) wherein both Iwax(s) and Iwax(t) are obtained by a formula: absorbance derived from the wax (2850 cm)/absorbance derived from the binder resin (828 cm).

Toner for developing a latent electrostatic image, method for producing the same, image-forming apparatus and process cartridge using the same

A toner including a binder resin including a polyester resin and a vinyl resin; a wax; and a colorant, wherein the vinyl resin includes a unit obtained from a radically polymerizable monomer having an alkyloxysilyl group. An image forming apparatus including an image bearing member configured to bear an electrostatic image thereon; a developing device configured to develop the electrostatic image with a developer including the toner to form a toner image on the image bearing member; and a transfer device configured to transfer the toner image onto a receiving material. A process cartridge including an image bearing member; and a developing device configured to develop an electrostatic image on the image bearing member with a developer including the toner, wherein the process cartridge is detachably attached to an image forming apparatus as a unit.

Toner for developing electrostatic image, and image forming apparatus and process cartridge using the toner

An image forming apparatus having at least a latent electrostatic image bearing member, and a recharging unit configured to recharge a residual toner remaining on the latent electrostatic image bearing member, wherein after transfer, the residual toner is passed through the recharging unit and is then recovered in a developing device; a charging component of the recharging unit that comes into contact with the latent electrostatic image bearing member is a polymer sheet having a surface roughness (Ra) of 0.12 &#x3bc;m to 0.51 &#x3bc;m; the toner contains at least a pigment, a binder resin, and a releasing agent, and contains inorganic fine particles as an external additive, and the amount of the inorganic fine particles and the amount of the releasing agent satisfy three specific Expressions.

Image forming apparatus

An image forming method, including charging a photoreceptor with a charger contacting thereto; irradiating the photoreceptor to form an electrostatic latent image thereon; developing the electrostatic latent image with a toner to form a toner image on the photoreceptor; transferring the toner image onto a recording material directly or through an intermediate transferer; and fixing the toner image on the recording material, wherein the toner includes a binder resin; a colorant; a composition having a low softening point; and an external additive, and wherein a surface resistivity Rse [&#x3a9;] of the charger and a volume resistivity Rsw [&#x3a9;&#xb7;cm] of the composition having a low softening point satisfy the following relationship:0.8&#xd7;10&#x3c;1.5&#xd7;10

The present invention aims at providing non-magnetic toner which is excellent in fixing property and charge property and capable of inhibiting occurrence of scumming, as well as an image forming apparatus and a process cartridge using the non-magnetic toner. A non-magnetic toner comprising: a toner base particle which comprises a binding resin, and a colorant; and external additives, wherein a surface of the toner base particle contains at least a resin having at least silanol group, and the external additives contain at least particles composed of silicon oxide.

Non-magnetic toner, image forming apparatus and process cartridge

The present invention provides a charge control agent, adapted to control charging ability of resins or compositions containing resins, comprising a copolymer that comprises a polymer block A and a polymer block B, the polymer block A is prepared by copolymerizing a maleimide, which being unsubstituted or substituted for a hydrogen atom of an imide group by an electron-donating group, and styrene or a styrene derivative, and the polymer block B is formed of a polymer of styrene or a styrene derivative.

Charge control agent, toner and toner producing method

The present invention relates to an image-forming method and a image-forming device, wherein a specific photosensitive member, an exposing process and a toner are adopted in combination.

Growing community of inventors

Ibaraki, Japan

Mitsuyo Matsumoto