Konica Corporation

Konishiroku Photo Industry Co., Ltd.

Yuji Marukawa

Kenji Yamane

Tomomi Oshiba

Hiroyuki Nomori

Masafumi Uchida

Hiroyuki Kozuru

Tatsuo Nakanishi

Kishio Tamura

Katsumi Matsuura

Tsuyoshi Uchida

Yoshihiko Etoh

Toshinori Yamazaki

Mayumi Hayashi

Kensuke Endo

Hatsumi Yamada

Shigeki Takenouchi

Disclosed is a developer for developing an electrostatic latent image, comprising:

Two component type developer for electrostatic latent image

A toner for developing an electro static latent image is disclosed. The toner comprises colored particles and fine titanium oxide particles, in which the transmittance of the fine titanium oxide particles in terms of a UV absorptiometry is 30-60% at 300 nm and 70-100% at 600 nm.

Toner and developers for developing static latent image

An electrophotographic toner is disclosed. The toner comprises a binder resin, a colorant and a mold releasing material, and the binder resin contains 8-32% by weight of 20,000-300,000 molecular weight component (MP), 12-28% by weight of high molecular weight component exceeding 300,000 (HP); that said HP content and MP content satisfy the following equation;

Electrophotographic toner with specific high, medium, and low molecullar

A toner used for developing an electrostatic charge image containing a coloring agent, a quaternary ammonium salt compound and polyolefin is disclosed. The quaternary ammonium salt compound is represented by formula (A) and have solubility to water of not more than 2.0%, and number-averaged dispersed diameter of polyolefin is 0.1 .mu.m-1.0 .mu.m. The toner satisfies formula (1);

Toner used for developing an electrostatic charge image

Disclosed is a developer for electrophotography, comprising a carrier and toner particles, wherein said carrier comprises a magnetic particle having thereon a resin coated layer, said magnetic particle including Fe.sub.2 O.sub.3 and an oxide compound of at least one kind of a light metal selected from the group consisting of lithium, beryllium, sodium, magnesium, potassium, calcium and rubidium, and wherein said toner particles have a compound represented by Formula (1), wherein an amount (g) of the compound on the surface (m.sup.2) of said toner particles, is 3.0.times.10.sup.-3 to 1.2.times.10.sup.-2 g/m.sup.2. : ##STR1## wherein, R.sup.1 through R.sup.4 independently represents an alkyl group having a carbon atom number of 1 to 18 or a benzyl group, A.sup.- represents an anion, provided that at least one of R.sup.1 through R.sup.4 represents an alkyl group having a carbon atom number of 8 to 18.

Developer for electrophotography

An electrophotographic image-forming method is disclosed. The image forming method comprises the steps of (1) forming an electrostatic latent image on a rotating electrophotographic photoreceptor having an organic photoconductive layer, (2) developing the electrostatic latent image with a toner comprising toner particles which contain a releasing agent existing in the toner particle in a form of insular domain having a number average diameter of 0.1 .mu.m to 1.1 .mu.m to form a toner image, (3) transferring the toner image to an image receiving member, and (4) cleaning the surface of the photoreceptor after the transferring step by a cleaning member having a rubber elastic cleaning blade having an impact resilience of 35 to 75% which is contacted to the surface of the photoreceptor in the direction counter to the rotating direction of the photoreceptor with a pressure of 5 to 40 g/cm, and the coefficient of static friction between the cleaning blade and the surface of the photoreceptor is not more than 1.0.

Electrophotographic image-forming method

A photoreceptor comprising a support bearing thereon a charge transport layer comprising one selected from the group consisting of a--SiC:H, a--SiC:F and a--SiC:H:F, a charge generating layer comprising one selected from the group consisting of a--SiH, a--SiF and a SiH:F, an a--Si type surface modifying layer containing one selected from the group consisting of N, O and C, and an a--Si type interlayer containing at least one selected from the group consisting of N, O and C, the content of said at least one of N, O and C in said interlayer being less than in said surface modifying layer, said interlayer being interposed between said charge generating layer and said surface modifying layer.

Growing community of inventors

Hachioji, Japan

Yuji Marukawa