Hitachi Chemical Company, Ltd.

Hitachi, Ltd.

Hitachi Chemical Company, Co.

Takayuki Akimoto

Shigeru Hayashida

Nobuyuki Hayashi

Seiji Tai

Mitsuo Katayose

Hideo Hagiwara

Megumi Matsui

Koichi Kamijima

Mikio Itagaki

Yoshii Morishita

Akio Mukoh

Setsuo Kobayashi

Susumu Era

Hiroko Ishikawa

Akira Kageyama

Yasuo Katsuya

Keiichi Endo

Seiji Miyaoka

Susumu Kaneko

Yasushi Shinbo

Kouji Ohkoshi

Koichi Kamajima

Susumu Sakio

An electrophotographic photoreceptor comprising a conductive support and a photosensitive layer which comprises a charge generation layer containing a charge generation material and a charge transport layer containing a charge transport material, the charge generation material comprising a phthalocyanine composition (A) which comprises a phthalocyanine, and the charge transport material comprising a benzidine derivative (B) represented by the following general formula (I) ##STR1## wherein each R.sup.1 independently is a halogen atom, an alkyl group, an alkoxy group, an aryl group, a fluoroalkyl group or a fluoroalkoxy group, each R.sup.2 independently is hydrogen atom or an alkyl group, m is an integer of 0 to 5, and when m is an integer of 2 to 5, the groups R.sup.1 are identical with or different from each other, and a coating solution for production of charge transport layers which contains the benzidine derivative (B).

Electrophotographic photoreceptor and coating solution for production of

Disclosed is a phthalocyanine composition which comprises having clear diffraction peaks at 17.9.degree., 24.0.degree., 26.2.degree. and 27.2.degree. of Bragg angles (2.theta..+-.0.2.degree.) in an X-ray diffraction spectrum with Cu K.alpha., a process for preparing the same, an electrophotographic photoreceptor using the same and a coating solution for forming a charge generation layer containing the same.

Phthalocyanine composition, process for preparing the same,

Phthalocyanine electrophotographic photoreceptor for charge generation

Disclosed are a phthalocyanine composition having main diffraction peaks at 7.5.degree., 22.5.degree., 24.3.degree., 25.3.degree. and 28.6.degree. of Bragg angles (2.theta..+-.0.2.degree.) in an X-ray powder diffraction spectrum with Cu K.alpha. radiation, a process for preparing the same, an electrophotographic photoreceptor using the same and a coating solution for a charge generation layer containing the same. The composition is made from a mixture of a titanylphthalocyanine and a halogenated group IIIA metal phthalocyanine which has been made amorphous by a strong mineral acid and crystallized from an organic solvent.

Phthalocyanine composition, process for preparing the same and

A charge transport layer formed from a composition comprising a mixed solvent containing alkoxybenzene and a charge transport material, or a photoconductive layer formed from a composition comprising alkoxybenzene and an organic photoconductive material are effective for producing electrophotographic members excellent in image without damaging the circumstances as well as stable in maintaining good charging characteristics and dark decay characteristics after repeated use.

Composition for forming charge transport layer and electrophotographic

Disclosed are a coating solution for forming a charge generation layer, which comprises:

Coating solution for charge generation layer and electrophotographic

Disclosed are a phthalocyanine composition which comprises having main diffraction peaks at 7.5.degree., 22.5.degree., 24.3.degree., 25.3.degree. and 28.6.degree. of Bragg angles (2.theta..+-.0.2.degree.) in an X-ray diffraction spectrum with Cu K.alpha., a process for preparing the same, an electrophotographic photoreceptor using the same and a coating solution for a charge generation layer containing the same.

A naphthalocyanine derivative of the formula: ##STR1## wherein M, Y, R.sup.1, k, l, m, n are as defined in the specification, is an effective substance for forming a recording layer on a substrate of an optical recording medium having high sensitivity with good properties.

Naphthalocyanine derivatives, production thereof, optical recording

Disclosed are a phthalocyanine composition which comprises having main diffraction peaks at 7.5.degree., 24.2.degree. and 27.3.degree. of Bragg angles (2.theta..+-.0.2.degree.) in an X-ray diffraction spectrum with Cu K.alpha., a process for preparing the same, an electrophotographic photoreceptor using the same and a coating solution for forming a charge generation layer containing the same.

Special tetraazaporphins containing Si, Ge or Sn as the central metal are useful for forming a recording layer in an optical recording medium.

Tatraazaporphin, process for producing the same, as well as optical

A naphthalocyanine derivative having at least one substituent of the formula: SO.sub.2 R.sup.1, wherein R.sup.1 is an alkyl group, a substituted alkyl group or an aryl group is excellent in ability to absorb diode laser beams and suitable for use in an optical recording medium.

Naphthalocyanine derivatives, production thereof and optical recording

A novel enamine derivative is effective as a charge transport material and can provide an electrophotographic plate excellent in sensitivity, photoresponse and durability.

Enamine derivatives

Tetraazaporphin, process for producing the same, as well as optical

2,3-dicyanonaphthalene derivatives useful in the synthesis of naphthalocyanine derivatives are disclosed. The 2,3-dicyanonaphthalene derivatives have the formula: ##STR1## wherein each R.sup.1 may be the same or different and represents an alkyl group, substituted alkyl group, or aryl group; and n is an integer from 1 to 4.

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Hitachi, Japan

Takayuki Akimoto