Fuji Xerox Co., Ltd.

Yukihiro Ishii

Koichi Tanaka

Takayoshi Aoki

Shigeru Sadamatsu

Yasuo Matsumura

Ken Hashimoto

Masato Ono

Hideo Maehata

Minoru Rokutan

Taketoshi Hoshizaki

Kazuhiko Yanagida

Masaaki Suwabe

Kazuhiro Koseki

Tsutomu Kubo

Michiaki Yasuno

Hidehiko Soyama

Kozo Oka

Yuzo Ozaki

Masato Takinami

Mitsuo Fukuda

Jun Mihara

Takeo Fusayama

Masayuki Maruta

Makiko Nakano

A method of producing an electrostatic latent image developing toner includes: preparing a resin particle dispersion by polymerizing, in a water-based solvent, a polymerizable monomer that comprises a polymerizable monomer comprising a vinyl-based double bond; extracting a liquid from the resin particle dispersion by heating; mixing the distilled resin particle dispersion with a colorant particle dispersion prepared by dispersing a colorant; and aggregating the resin particles, the pigment particles and a release agent particles to form aggregate particles, and then conducting heating to fuse the aggregate particles.

Method of producing electrostatic latent image developing toner

Semiconductive members such as charging members, copying members, pressure fixation rolls, electricity removing members and the like having a small environmental dependence are provided. The semiconductive member of the present invention contains a semiconductive substrate, a conductive rubber layer, an intermediate layer, a resistance control layer the constituent material of which is a polyurethane ionomer having an ionic segment in the molecule, and a surface layer. The ionic segment is selected from among a sulfonic acid group, a carboxyl group and a tertiary amino radical, or the salts thereof. In addition, the glass transition temperature of this polyurethane ionomer is 30.degree. C. or less, and the volume specific resistance value is in the range of 10.sup.6 to 10.sup.9 W cm.

Semiconductive member and production method thereof

A charge roll for electrophotography wherein surface of the roll is formed from a resin layer containing BaSO.sub.4 particles coated with SnO.sub.2-x (wherein 0.ltoreq.X.ltoreq.1) is disclosed. The charge roll may comprise a roll shaft, an electroconductive elastic layer and the surface resin layer. The charge roll may further comprise an intermediate layer formed between the electroconductive elastic layer and the surface resin layer.

Charge roll for electrophotography

A toner for developing an electrostatic image is disclosed, essentially comprising as a colorless charge electrification controlling agent causing no environmental pollution, a complex compound containing a silicon atom to which at least 2 mols of at least one of a chelating monocyclic or polycyclic aromatic diol, monocyclic or polycyclic aromatic hydroxycarboxylic acid, or monocyclic or polycyclic aromatic dicarboxylic acid is coordinated per mol of the silicon atom. The toner exhibits stable charging properties against environmental changes or on repeated use.

Electrostatic image developing toner comprising complex compounds

A developer for an electrostatic latent image is disclosed, which comprises a carrier powder, a toner powder, and a fine powder that has a particle size smaller than that of the toner powder said fine powder being made of a polymer which is located closer to the carrier side of the triboelectric series than to the toner side. The developer does not cause insufficient cleaning or toner filming on a photoreceptor or electrostatic recording element.

Developer composition for electrophotography comprising fine particles

A developer for an electrostatic latent image is described, which comprises a toner powder and a fine powder having a particle size smaller than that of the toner powder, said fine powder being made of a polymer obtained by soap-free emulsion polymerization.

Developer and toner composition produced by emulsion polymerization

A developer for an electrostatic latent image is disclosed, which comprises a toner powder and a fine powder of an acrylic homopolymer or copolymer having an average particle size smaller than that of the toner powder. The developer can be easily cleaned off without causing damage to a latent image-forming member.

Electrophotographic developer comprising toner particles and acrylic

A method for controlling charging of toner particles and/or charge-imparting materials used in electrophotography is disclosed, which comprises using as a charge-exchange control agent an organic boron compound composed of a boron-containing organic anion component and a cation component. A color developer containing the charge-exchange control agent is also disclosed, which is free from variation of tone and reduction of transparency due to the addition of the charge-exchange control agent.

Charge controlling method and developers containing a charge-exchange

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Kanagawa, Japan

Yukihiro Ishii