Konica Corporation

Konica Minolta, Inc.

Michiaki Ishikawa

Meizo Shirose

Hiroyuki Takagiwa

Keiko Ogawa

Yoshiki Nishimori

Ryuji Kitani

Hiroya Masaki

Hiroshi Yamazaki

Tatsuya Nagase

Koji Shibata

Masafumi Uchida

Akitoshi Matsubara

Hiroyuki Kozuru

Shigenori Kouno

Takao Yamanouchi

Tsuyoshi Uchida

Yasuko Yamauchi

Mikio Kohyama

Keiko Ujihara

An image forming method uses a photoreceptor including at least an aluminum substrate, a toner for developing an electrostatic image including toner particles containing at least a binding resin, and a developer bearing member including a member that generates a magnetic flux inside, wherein the aluminum substrate contains silicon, a silicon content of the aluminum substrate is more than 0.6% by mass, and a glass transition point (Tg) of the toner for developing an electrostatic image is in a range of 0 to 45° C.

Image forming method and image forming system

A white toner for electrostatic charge image development contains a toner particle that includes a toner base particle containing a binder resin, a white colorant, and a releasing agent, and an external additive, wherein the toner particle contains, as the external additive, a fatty acid metal salt particle having a volume-based median diameter in a range of 0.5 to 1.5 &#x3bc;m, and an average circularity of the toner particles is in a range of 0.870 to 0.950.

White toner for electrostatic charge image development and image forming method

An electrostatic photographic image forming toner is disclosed. The toner comprises a toner particle containing a binder resin and a colorant in which the binder resin has a specific softening point of from 105 to 132&#xb0; C. and the toner particle has a hardness of from 6.0 to 24.0 mN and a circularity of from 0.92 to 0.99.

Toner particle having a hardnes of 6.0 to 24.0 mN and a circularity of 0.92 to 0.99

Disclosed is a toner for developing an electrostatic latent image, comprising colored particles containing a colorant and a binder resin, and hydrophobic particles, wherein said colored particles have a BET specific surface area of not less than 5 m.sup.2 /g and said hydrophobic particles satisfy the following relation:

Toner for developing electrostatic latent image developer and method for

A toner for forming an electrophotographic image is disclosed. The toner comprises (1) colored particles comprising a resin and a colorant, (2) fine resin particles comprising a polymer formed by condensation of melamine and formaldehyde, and have a volume average diameter of 0.01 .mu.m to 1.0 .mu.m, and (3) fine particles of an inorganic material (I) having a volume average diameter of 0.01 .mu.m to 0.20 .mu.m and a standard deviation of distribution of the volume average diameter G satisfying the condition of 10.ltoreq..sigma..ltoreq.30. It is particularly preferred that the toner is used as a tow componet developer together with a negatively chargeable carrier which comprises (1) magnetic core particles each coated with a coating layer comprising a mixture of homopolymer of an alicyclic methacrylate monomer and a homopolymer of an acyclic methacrylate monomer, or a copolymer of an alicyclic methacrylate monomer and an acyclic methacrylate monomer, and (2) a fine particles of an inorganic material (II).

Toner for forming electrophotographic image and developers using the same

Disclosed is a two component type developer for negatively chargeable developer use, comprising a carrier and a colored toner particle comprising a binder resin and a colorant, wherein said carrier comprises a magnetic particle having thereon a resin coated layer containing a resin and a magnesium compound.

Two-component type developer and image forming process

Disclosed is a carrier for a negatively chargeable developer comprising magnetic particles and provided thereon, having a layer comprising a hydrophilic silica having a degree of degree of hydrophobicity of less than 20 and resin particles.

Carrier for negatively chargeable developer

Disclosed is a developer comprises a toner containing colorant particles and organic fine particles, wherein said organic fine-particles are a fluoro-containing acrylate homopolymer or the copolymers thereof, each having a cross-linking structure.

Developer for developing electrostatic image comprising a toner

A negative charge developer for electrophotography comprises a toner and a carrier having a core coated with a resin which contains at least one magnesium compound of a magnesium oxide, a magnesium hydroxide or a magnesium carbonate, wherein the magnesium compound has a single crystal structure.

Negatively chargeable developer with carrier containing magnesium oxide

A resin coated carrier for developing an electrostatic image is disclosed. The carrier coating layer comprises a resin copolymerized of at least three fluorinated vinyl monomers. The carrier is useful for developing a negative charged electrostatic image formed on an organic photoreceptor.

Electrostatic image developing resin-coated carrier and method for

A developer for electrophotography is disclosed. The developer comprises a carrier comprising magnetic particles being coated with a fluororesin in which an alkali salt of a fatty acid is contained in an amount of from 0.05 to 0.5% by weight of said carrier, and a toner comprising a colored particle comprising a colorant and a reaction product of a styrene-acryl copolymer having carboxyl groups with a multivalent metal compound, and an inorganic particle containing an ammonium salt-modified polysiloxane. The developer is excellent in the reproducibility of fine line, the density uniformity of solid image and the fine line-reproducibility in copies formed by successive generations and the durability.

Developer for electrophotography

An electrostatic latent image developer that is composed of at least three components, toner resin particles containing at least a colorant, carrier particles and fine inorganic particles is disclosed. The improved feature of the developer is that said toner resin particles contain a resin crosslinked with a divalent metal or metals of higher valency and that said fine inorganic particles are surface-treated with an ionic silicone compound.

Electrostatic latent image developer

A method for forming an electrophotographic image, comprising forming an electrostatic latent image on a latent image carrier, developing said latent image with a developer to form a toner image, transferring said toner image on a recording material, and fixing the toner image with a heat roller, is disclosed. The method is characterized by:

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Hachioji, Japan

Michiaki Ishikawa