Mitsubishi Chemical Corporation

Mitsuo Wada

Kazutaka Ida

Tadashi Mizushima

Teruyuki Mitsumori

Hiroaki Takamura

Hiroe Fuchigami

Atsushi Yoshizawa

Akiteru Fujii

Wataru Miyashita

Mamoru Nozomi

Akira Ando

Yuka Nagao

Takahiro Choda

Takayuki Shouda

An object of the present invention is to provide an electrophotographic photoreceptor which can prevent an increase in potential even using a fluorine resin in a charge transport layer, and can achieve both electrical properties and abrasion resistance, and present invention relates to a lamination type electrophotographic photoreceptor, in which a charge transport layer of the lamination type electrophotographic photoreceptor contains a compound having an E_homo of &#x2212;4.550 eV or more based on structure optimization calculation by density functional calculation B3LYP/6-31G (d, p) and fluorine resin particles, and a content of the fluorine resin particles is 3% by weight to 20% by weight based on a total mass of the charge transport layer.

Electrophotographic photoreceptor, electrophotographic photoreceptor cartridge and image forming apparatus

The present invention relates to an electrophotographic photoreceptor comprising: a conductive support; and a photosensitive layer disposed on the conductive support, wherein the photosensitive layer includes a polyester resin containing a dihydric phenol residue and a dicarboxylic acid residue, and the dihydric phenol residue includes at least one dihydric phenol residue selected from the group of the specific dihydric phenol residues, and the other specific dihydric phenol residue.

Electrophotographic photoreceptor and image forming apparatus

The present invention relates to an electrophotographic photoreceptor which is a positive charging type electrophotographic photoreceptor comprising a conductive support and a photosensitive layer on the conductive support, wherein the photosensitive layer contains at least a charge generating material, a hole transport material, an electron transport material, and a binder resin in the same layer, and a residual potential VLat a point at which an exposure amount for forming a latent image is 0.3 &#x3bc;J/cmis equal to or lower than 130 V when an initial surface potential V0 is set to +700 V, exposure with monochromatic light of 780 nm is performed and measurement is performed by a dynamic method.

Electrophotographic photoreceptor, image forming apparatus, and coating liquid for forming photosensitive layer

The present invention relates to an electrophotographic photoreceptor comprising: a conductive support; and a photosensitive layer on the conductive support, wherein the photosensitive layer contains a charge transport substance, a binder resin, and a compound which has a molecular weight of equal to or less than 350, and is represented by General Formula (1).

Electrophotographic photoreceptor, electrophotographic photoreceptor cartridge, and image forming apparatus

The present invention is to provide a charge transport substance having high resistance to stress within electrophotographic processes, an electrophotographic photoreceptor which has excellent high-speed responsiveness, shows a sufficient residual potential, and has high resistance to stress within electrophotographic processes, an electrophotographic cartridge, and an image-forming apparatus. The invention provides a charge transport substance having a specific structure. The invention further provides an electrophotographic photoreceptor including a photosensitive layer which contains the charge transport substance having a specific structure, an electrophotographic cartridge, and an image-forming apparatus, equipped with this electrophotographic photoreceptor.

Charge transport substance, electrophotographic photoreceptor, electrophotographic photoreceptor cartridge, and image-forming apparatus

Provided is an excellent phthalocyanine crystal having high sensitivity and little fluctuation in sensitivity for a humidity change in a use environment and applicable to the martial for solar battery, electronic paper, electrophotographic photoreceptor, etc. Namely, phthalocyanine crystal obtained by bringing a phthalocyanine crystal precursor into contact with an aromatic aldehyde compound to convert the crystal form. Also, provided is an electrophotographic photoreceptor that not only exhibits high sensitivity but also has little fluctuation in sensitivity for a humidity change in a use environment. Further, provided is an electrophotographic photoreceptor cartridge and an image-forming device, both of which can produce a stable quality images for a humidity change in a use environment by using the electrophotographic photoreceptor.

Phthalocyanine crystal, and electrophotographic photoreceptor, electrophotographic photoreceptor cartridge and image-forming device using the same

The present invention relates to an electrophotographic photoreceptor comprising a conductive support and a photosensitive layer disposed thereover, wherein the photosensitive layer comprises a compound represented by general formula (1) and palladium, the photosensitive layer having a palladium content of 0.01-50 ppm. 

Electrophotographic photoreceptor, electrophotographic cartridge, image forming apparatus, and charge transport substance

The present invention relates to an electrophotographic photoreceptor comprising an electroconductive support and at least a photosensitive layer formed on the support, wherein the photosensitive layer contains a specific charge transport substance.

Electrophotographic photoreceptor, electrophotographic photoreceptor cartridge, image-forming apparatus, and triarylamine compound

A phthalocyanine composite with high sensitivity and low environmental dependence is provided. It comprises both at least one phthalocyanine compound expressed by general formula (1) and at least one phthalocyanine compound expressed by general formula (2):  where, in the general formulae (1) and (2), Mrepresents at least one arbitrary atom or atomic group that is capable of binding to a phthalocyanine, Mrepresents an atom, or an atomic group containing an atom, selected from the second and subsequent periods of the periodic table and capable of binding to a phthalocyanine, Mand Mbeing different in kind from each other, X-Xrepresent, independently of each other, a halogen atom, and a, b, c, and d represent, independently of each other, an integer between 0 and 4 and satisfy a+b+c+d&#x2267;1.

Phthalocyanine composition and photoconductive material, electrophotographic photoreceptor cartridge, and image-forming apparatus each employing the composition

The present invention provides an electrophotographic photoreceptor which has high light resistance, has high durability in exposure to oxidizing gases such as ozone and NO, is excellent in mechanical properties such as printing durability, wearing resistance, marring resistance, and slip properties in repetitions of use, and further has excellent electrical properties. Specifically, the present invention provides an electrophotographic photoreceptor having an electroconductive substrate and provided thereon at least a photosensitive layer having a charge generation material, a charge transport material, and a binder resin.

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Kanagawa, Japan

Mitsuo Wada