Ricoh Company, Ltd.

Norio Nagayama

Yuuji Tanaka

Hiromi Tada

Kazukiyo Nagai

Tatsuya Niimi

Masafumi Ohta

Naohiro Toda

Yoshiki Yanagawa

Takafumi Iwamoto

Yoshinori Inaba

To provide an electrophotographic photoconductor, which contains a layer containing a cured product obtained by crosslinking (i) a compound containing a charge-transporting group and three or more methylol groups, and (ii) a compound containing a charge-transporting group, which is other than the compound containing a charge-transporting group and three or more methylol groups.

Electrophotographic photoconductor, image forming method, image forming apparatus, and process cartridge

An electrophotographic photoreceptor, including a charge generation layer and a charge transport layer on an electroconductive substrate, wherein the charge generation layer includes titanylphthalocyanine and a binder resin which is a crosslinked material of a resin comprising a polyvinylbutyrat site having the following formula (1) and an isocyanate compound having the following formula (2): wherein R1 and R2 independently represent an alkyl group having 1 to 3 carbon atoms; k, l, m and n represent composition ratios and k+1 is from 0.60 to 0.80, wherein k or 1 may be 0, m is from 0.02 to 0.03, and n is from 0.20 to 0.40; wherein A represents a substituted or unsubstituted organic group having 2 to 4 valences; and O represents an integer of from 2 to 4.

Electrophotographic photoreceptor, and image forming apparatus and process cartridge therefor using the photoreceptor

An electrophotographic photoreceptor, including an electroconductive substrate; and a photosensitive layer overlying the substrate, wherein the photosensitive layer comprises a complex azo pigment comprising an azo compound having the following formula (a):A(H)&#x2003;&#x2003;(a)wherein A represents a residue of an azo compound, bonded with n pieces of hydrogen atom through one or more heteroatom being N or O and forming a part of the residue A; H represents a hydrogen atom; and n represents an integer of from 1 to 9,and a pigment.

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Shizuoka, Japan

Norio Nagayama