Konica Minolta, Inc.

Konica Minolta Business Technologies, Inc.

Futoshi Kadonome

Satoshi Uchino

Shinya Obara

Ikuko Sakurada

Takuya Takahashi

Koji Shibata

Kosuke Nakamura

Noriyuki Kimpara

Keiji Arai

Junichi Furukawa

Yukio Hosoya

Hiroyuki Kozuru

Yoshiyasu Matsumoto

Yasuko Uchino

Saburou Hiraoka

Takanari Kayamori

Kazue Nakamura

Provided is an electrostatic charge image developer containing toner particles and carrier particles, wherein the toner particles contain at least silica particles or alumina particles as an external additive; the carrier particles contain core material particles and a coating resin layer covering a surface of the core particles; the coating resin layer contains metal oxide particles; an element measured by XPS (photoelectron spectroscopy) of the carrier particle is at least Si or Al; and a content of Si or Al in the carrier particle is in the range of 1 to 6 at % with respect to the total elements constituting the carrier particles.

Electrostatic image developer

Provided is an electrostatic latent image developing toner including toner mother particles having an external additive on a surface of the toner mother particles, wherein the external additive contains inorganic particles and aliphatic acid metal salt particles; the inorganic particles have a number average particle diameter in the range of 10 to 50 nm, and have a Mohs hardness of 8 or more; and the aliphatic acid metal salt particles have a number average particle diameter in the range of 0.4 to 2.0 &#x3bc;m.

Electrostatic latent image developing toner and image forming method

Provided is a two-component developer for developing an electrostatic latent image containing: toner particles having toner mother particles and an external additive on a surface of the toner mother particles; and carrier particles, wherein the external additive contains alumina particles; the alumina particles are subjected to a surface modification with a hydrophobilizing agent; among the hydrophobilizing agent existing on the surface of the alumina particles after the surface modification, a ratio of the hydrophobilizing agent in a state of being liberated from the surface is 20% or less when extraction treatment is performed under a predetermined condition; the alumina particles have a number average primary particle diameter in the range of 5 to 60 nm; and the carrier particles have a resin covering layer, and the resin covering layer is formed with an alicyclic (meth)acrylate monomer.

Two-component developer for developing electrostatic latent image

The present invention provides a two-component developer for developing an electrostatic charge image, which includes a toner and a carrier, wherein the toner contains an amorphous resin and a crystalline resin as binder resins and an inorganic particle as external additive particle, and the carrier has a surface to which silica particles having a number average particle diameter of 10 to 30 nm are attached in an amount in the range of the following Equation (1): 5 at %&#x2264;S1&#x2264;10 at %, wherein S1 represents a concentration of Si element as measured by XPS and indicates an amount of silica on the surface of the carrier.

Two-component developer and image forming method using the same

A toner for developing electrostatic images, including toner particles containing an external additive on surfaces of toner matrix particles. The external additive contains at least a lanthanum-containing titanate compound.

Toner for developing electrostatic images

Provided is a carrier for electrostatic charge image development which provides a two-component developer having a high electric charge amount, a suppressed variation in an electric charge amount caused by an environmental change, and excellent durability, even if a low temperature fixable toner is used. A carrier for electrostatic charge image development of the present invention includes: carrier particles in which a core particle surface is coated with a coating material containing a resin, wherein the coating material contains phosphorus element, and the resin contains structural units derived from an alicyclic (meth)acrylic acid ester compound.

Carrier for electrostatic charge image development and two-component developer for electrostatic charge image development

A toner for developing an electrostatic latent image includes: toner base particles containing a hybrid crystalline polyester resin having a crystalline polyester polymerized segment and an amorphous polymerized segment chemically bonded to each other and an amorphous resin; and an external additive including fatty acid metal salt particles, wherein a volume median diameter of the fatty acid metal salt particles is from 3.0 to 5.0 &#x3bc;m.

Toner for developing electrostatic latent image

The toner of the present invention contains: a toner base particle, and a silica particle and a fatty acid metal salt particle adhering to a surface of the toner base particle. The toner base particle contains a crystalline polyester resin and an amorphous polyester resin. The toner particle has an average circularity of 0.945 to 0.965. The silica particle has a volume average particle size of 70 to 300 nm, and has an average circularity of 0.5 to 0.9. The fatty acid metal salt particle has a median diameter based on a volume of 0.50 to 2.00 &#x3bc;m.

Toner

An electrostatic latent image developing toner of the present invention includes toner base particles and particles containing a fatty acid metal salt. The toner base particles contain a crystalline resin containing a segment of a first resin and a segment of a second resin chemically bonded to each other and an amorphous resin containing at least the second resin. The crystalline resin is a hybrid crystalline polyester resin. The first resin is a crystalline polyester resin. The second resin is an amorphous resin. The volume-based median diameter (Da) of the toner base particles and the volume-based median diameter (Db) of the particles containing the fatty acid metal salt satisfy the relations represented by Expressions (1) and (2) below:0.5 &#x3bc;m&#x2266;&#x2266;2.0 &#x3bc;m&#x2003;&#x2003;Expression (1)0.1&#x2266;0.5.&#x2003;&#x2003;Expression (2)

Electrostatic latent image developing toner

Provided is an electrostatic image developing toner including a toner mother particle containing a colorant and a binder resin comprising a crystalline resin and an amorphous resin; and an external additive. The external additive includes an inorganic fine particle having a number average major axis in a range of 50 to 100 nm, an average aspect ratio in a range of 3 to 10, and a volume resistivity in a range of 1&#xd7;10to 1&#xd7;10&#x3a9;&#xb7;cm in primary particles.

Electrostatic image developing toner and two-component electrostatic image developer

A process of forming an image includes the steps of: developing an electrostatic latent image with a toner, the latent image being formed through charge of the surface of an electrostatic latent image carrier and exposure of the surface to light; and applying a lubricant onto the surface of the electrostatic latent image carrier. The toner includes a toner matrix particle and an external additive nanoparticle. The external additive nanoparticle comprises a silica-polymer composite nanoparticle. A percentage of atomic silicon present on the surface of the silica-polymer composite nanoparticle satisfies Condition A expressed by Expression: 15.0 atm %&#x2266;percentage of atomic silicon ({Si/(C+O+Si)}&#xd7;100)&#x2266;30.0 atm %. The percentage of atomic silicon is determined from total amounts of atomic carbon, oxygen, and silicon present on the topmost surface of the silica-polymer composite nanoparticle and within 3 nm inwards from the topmost surface.

Image forming process

A toner for electrostatic latent image development of the present invention includes toner particles containing toner mother particles and an external additive. The external additive contains fatty acid metal salt particles, and a volume based particle diameter (size) distribution of the fatty acid metal salt particles has two peaks on a side of smaller size and a side of larger size, respectively. A volume based mean particle diameter of the fatty acid metal salt particles having the peak on the side of smaller size is 3.0 &#x3bc;m or smaller and a volume based mean particle diameter of the fatty acid metal salt particles having the peak on the side of larger size is larger than a volume based mean particle diameter of the toner mother particles.

Electrostatic latent image developing toner, production method of the toner for electrostatic latent image development and electrophotographic image formation method

Disclosed is toner in which is used in an image formation process comprising the steps of transferring an image of toner formed on a photoreceptor onto a recording sheet, and removing any residual toner remaining on any of the photoreceptor, an intermediate transfer member and a secondary transfer member with a cleaning blade, the toner containing at least toner particles (A) and small particles (B), wherein the toner particles (A) have an average circularity of from 0.93 to 0.99 and a number-based median diameter (D) of from 3.0 to 8.0 &#x3bc;m, the small particles (B) have an average circularity of from 0.70 to 0.92 and a number-based median diameter (D) of from 0.15 to 0.60 times that of the toner particles (A), and the surface energy of the toner particles (A) is different from that of the small particles (B).

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Sagamihara, Japan

Futoshi Kadonome