Mitsubishi Chemical Corporation

Yuka Nagao

Teruyuki Mitsumori

Akiteru Fujii

Masayuki Hiroi

Tadashi Mizushima

Rui Zhao

Atsushi Yoshizawa

Hitoshi Ono

Mitsuo Wada

Hiroaki Takamura

Yuuta Kumano

Wataru Miyashita

Tomoko Nakagawa

Ichiro Yokotake

Takayuki Shoda

Toyoshi Ohashi

Masami Tsurumori

Shunichiro Kurihara

Yasuko Osano

Yuko Kojima

Masatomi Ozawa

Shunichirou Kurihara

Tooru Uenaka

The object of the present invention is to provide a positive charging electrophotographic photoreceptor having high sensitivity, low residual potential, and excellent chargeability, and relates to a positive charging electrophotographic photoreceptor including a conductive support, a photosensitive layer, and a protective layer in this order, the photosensitive layer containing a charge generation substance, a positive hole transport substance, and an electron transport substance in the same layer, in which the positive hole transport substance includes at least one of the compounds represented by any one of the following formulas (1) to (5), and a binder resin of the protective layer is an alcohol-soluble thermoplastic resin, providing that the symbols in the formula are defined in the specification. 

Positive charging electrophotographic photoreceptor, electrophotographic cartridge and image forming apparatus

An electrophotographic photoreceptor that includes a conductive support; and at least a charge generation layer and a charge transport layer on the conductive support, where the charge transport layer includes at least two layers of a first charge transport layer which is an outermost layer and a second charge transport layer which is in contact with the first charge transport layer, such that the elastic deformation ratio of a binder resin A contained in the first charge transport layer is T1(%) and the elastic deformation ratio of a binder resin B contained in the second charge transport layer is T2(%) such that T1 and T2 satisfy a relationship of {0&#x2264;(T1&#x2212;T2)&#x2264;4}, the first charge transport layer contains a charge transport material &#x3b1; having a molecular weight of 600 or more, and the binder resin A and the binder resin B have different monomer units from each other.

Electrophotographic photoreceptor, electrophotographic photoreceptor cartridge and image forming apparatus

An electrophotographic photoreceptor comprises a conductive support and, at least a photosensitive layer on the conductive support, wherein the photosensitive layer includes a polyarylate resin and the polyarylate resin has a repeating structure represented by formula (1), and the amount of bisphenol residues represented by formula (3) after the polyarylate resin is hydrolyzed, is 0.2% to 1%, in terms of intensity ratio, based on the total amount of bisphenol residues represented by formula (2) and formula (3) after the polyarylate resin is hydrolyzed, the bisphenol residues being detected with a gas chromatograph employing a hydrogen flame ionization detector (FID).

Electrophotographic photoreceptor, electrophotographic photoreceptor cartridge, image forming apparatus, and polyarylate resin

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 a conductive support and at least a photosensitive layer provided thereon, wherein the electrophotographic photoreceptor comprises an outermost layer which contains a specific charge transport substance and a specific compound.

Electrophotographic photoreceptor, electrophotographic photoreceptor cartridge, and image forming apparatus

To provide an electrophotographic photoreceptor having a high sensitivity, a good balance of various electric properties such as chargeability and residual potential, a good stability of the coating solution, and an excellent light resistance. An electrophotographic photoreceptor comprising an electroconductive support having thereon a photosensitive layer, wherein the photosensitive layer contains a compound represented by the following formula (1): (wherein Rrepresents a group having a chiral center, Rrepresents a hydrogen atom, an alkyl group which may have a substituent, or an aryl group which may have a substituent, Rand Reach independently represents an alkylene group which may have a substituent, or an arylene group which may have a substituent, and R, R, Rand Reach independently represents an alkyl group which may have a substituent, or an aryl group which may have a substituent, and at least one member of Rto Ris an aryl group having a substituent).

Electrophotographic photoreceptor and image-forming apparatus

An electrophotographic photoreceptor is provided which comprises a conductive substrate and a photosensitive layer formed thereover, wherein the photosensitive layer contains at least a polyarylate resin having a repeating structure represented by the following formula [1] and a compound represented by the following formula [6]. This photoreceptor has excellent abrasion resistance under practical load, has high mechanical strength, and further has highly excellent electrical properties. 

Electrophotographic photoreceptors, electrophotographic photoreceptor cartridge, and image-forming apparatus

To realize an electrophotographic photoreceptor excellent in abrasion resistance, the photosensitive layer of the photoreceptor comprises a polyester resin containing a repeating structural unit represented by the formula (1) and a hydrazone compound. (In the formula (1), Arto Areach represents, independently of each other, an arylene group which may have a substituent. Xrepresents a bivalent group (including a single bond) and Xrepresents a bivalent group (including a single bond) with 3 or less atoms.)

Electrophotographic photoreceptor, and image forming device and electrophotographic photoreceptor cartridge using the same member cartridge

An electrophotographic photoreceptor which is excellent in sensitivity, durability and environmental capability comprises a photosensitive layer containing dihydroxysilicon phthalocyanine which is monoclinic and has lattice constants a=12.8.+-.1.ANG., b=14.5.+-.1.ANG., c=6.8.+-.1.ANG. and .beta.=94.4.+-.1.degree.. ##STR1##

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Kanagawa, Japan

Yuka Nagao