Konica Corporation

Yoshihiko Etoh

Takeo Oshiba

Yoshiaki Takei

Asao Matsushima

Akira Kinoshita

Tomoo Sakimura

Tomoko Suzuki

Kiyoshi Tamaki

Koichi Kudoh

Hiroshi Yamazaki

Akihiko Itami

Hirofumi Hayata

Katsumi Matsuura

Yuji Marukawa

Takeo Ooshiba

Chikusa Fukumoto

Disclosed is an electrophotographic photoreceptor comprising an electrically conductive support and thereon formed a light-sensitive layer containing a carrier generation material, a carrier transport material and a binder resin, wherein said light-sensitive layer comprises a copolymer having a structural unit represented by Formula B.sub.1 and Formula B.sub.2 ; ##STR1## wherein R.sub.1 and R.sub.2 independently represent a hydrogen atom, an alkyl group having 1 to 6 carbon atoms, or an aryl group, R.sub.1 and R.sub.2 may combine together to form a cyclic hydrocarbon residue having 4 to 10 carbon atoms, R.sub.3, R.sub.4, R.sub.5 and R.sub.6 independently represent a hydrogen atom, a halogen atom, an alkyl group having 1 to 6 carbon atoms, a cyclic hydrocarbon residue having 4 to 10 carbon atoms, or an aryl group, l, m, p and q independently represent an integer of 1 to 4. The electrophotographic photoreceptor has high sensitivity and high durability.

Electrophotographic photoreceptor

Disclosed is an electrophotographic photoreceptor comprising a conductive support and provided thereon an intermediate layer, a carrier generation layer and a carrier transport layer, wherein an outermost layer of said electrophotographic photoreceptor contains silica particle each containing an aluminium ingredient of not more than 1000 ppm, a calcium ingredient of not more than 300 ppm and a iron ingredient of not more than 1000 ppm, and said silica particles have a volume average particle size of 0.05 through 5 .mu.m.

Electrophotography photoreceptor

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

An electrostatic image forming method is disclosed. The photoreceptor containing an organic photosensitive material has a layer containing fine particles at the photoreceptor surface; toner has at least binder resin, coloring agent, and releasing agent made of polyolefines in which the ratio, Mz/Mn, is is 3-20, and Mz is 20,000-70,000 wherein Mz is Z-average molecular weight in terms of polypropylene and Mn is the number average molecular weight in terms of polypropylene. No offset phenomenon occurs, and a stable image having no fogging and no black-spots can be formed for a long period of time by the invention.

Image forming method

Disclosed is an image forming method using an electrophotographic photoreceptor comprising the steps of:

Image forming method using an imidazole-perylene electrophotographic

Disclosed is an electrophotographic photoreceptor contains a carrier generation material represented by Formula 1 or 2 having peaks at 2.theta.=6.3.degree., 12.4.degree., 25.3.degree. and 27.1.degree. in the Bragg angle (2.theta..+-.0.2.degree.) as measured by X-ray diffraction under radiation of Cu-K.alpha. rays; said peak of 12.4.degree. has a maximum intensity and has a half width of 0.65.degree. or more; no peak being present at 11.5.degree.; and

The present invention is directed to a photoreceptor having an electroconductive support, a barrier layer, a charge generation layer and a charge transport layer, all formed on the support in this order, wherein the barrier layer consists of an alcohol-soluble copolymerized polyamide resin, the charge generation layer contains a compound represented by formula I or II, and the charge transport layer contains a polycarbonate resin having a molecular weight of not less than 100,000, ##STR1## wherein Z represents a groups of atoms necessary to form a substituted or unsubstituted divalent aromatic ring.

Photorecptor for electrophotography and image forming method

Disclosed is a method for preparing an electrophotographic photoreceptor comprising the steps of:

Growing community of inventors

Hachioji, Japan

Yoshihiko Etoh