Konica Corporation

Konishiroku Photo Industry Co., Ltd.

Hiroya Masaki

Hiroyuki Takagiwa

Jiro Takahashi

Meizo Shirose

Michiaki Ishikawa

Hiroyuki Yamada

Kunio Shigeta

Akitoshi Matsubara

Masafumi Uchida

Satoru Ikeuchi

Takahira Kasuya

Kenzi Tsuzita

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:

Method for forming electrophotographic images

A developer for developing an electrostatic latent image containing (i) toner particles, (ii) inorganic fine particles of which surfaces are treated by a polysiloxane having an ammonium salt as a functional group, and a developer containing (i), (ii) above and (iii) carrier particles of which surfaces are coated by a resin, and a method of developing an electrostatic latent image by the use of the above developer are disclosed.

Electrostatic latent image developer with toner particles surface

A toner for developing an electrostatic latent image containing a polyester resin binder obtained by condensation polymerization of a diol component and a mixture of acid components. The acid components are an aliphatic unsaturated dicarboxylic acid or an acid anhydride thereof and a polybasic carboxylic acid having not less than three carboxylic acid groups or an acid anhydride thereof. A ratio of the polybasic carboxylic acid having not less than three carboxylic acid groups or the acid anhydride thereof to the total acid components is in the range of from 5 mol % to less than 30 mol %.

Developer composition for developing electrostatic image and toner image

A method of developing an electrostatic latent image wherein an electrostatic latent image with a negative polarity is formed on an organic photoreceptor and developed with a toner bearing a positive electric charge. The toner used to develop the latent image includes a binder resin, a coloring agent, silica, zinc stearate, and at least one oxide selected from hydrophobic aluminum oxide and hydrophobic titanium oxide. This method of developing the electrostatic latent image produces an image having a higher maximum image density.

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Hachioji, Japan

Hiroya Masaki