Hodogaya Chemical Co., Ltd.

Ricoh Company, Ltd.

Denso Corporation

Richoh Company, Ltd.

Mitsutoshi Anzai

Masaomi Sasaki

Tomoyuki Shimada

Atsushi Takesue

Akihiro Imai

Kazukiyo Nagai

Chiaki Tanaka

Nozomu Tamoto

Chihaya Adachi

Akira Katayama

Masafumi Ohta

Katsuhiro Morooka

Tamotsu Aruga

Takanobu Watanabe

Kayoko Watanabe

Chieko Inayoshi

Hiroshi Tamura

Tetsuro Suzuki

Osamu Mukudai

Yuji Matsuura

Yasuo Murakami

Shigeru Kusano

Makoto Koike

Katsumi Abe

Noboru Akuzawa

Kouji Kishida

Masahiko Yamaguchi

Michihiro Gonda

Mikiko Kanasugi

Shinya Nagai

Yuuji Matsuura

Miki Kanno

Susumu Suzuka

Hideyuki Otsuka

Toshiyuki Abe

Hiroyoshi Yamaga

Masaki Okubo

Kazuyuki Wakasugi

Tetsuya Kato

Isao Niimura

Katsumasa Kikkawa

Kazushige Kojima

Toshio Obara

Shinji Otani

Genpei Sugiyama

Noriyuki Suzuki

Masafumi Ota

Masaki Ohkubo

The present invention provides a method for producing a tetramine compound represented by formula (1): wherein R1, R2 and R3, which may be the same or different, each represents a hydrogen atom, a tertiary alkyl group having 4 to 8 carbon atoms, an unsubstituted aryl group or an aryl group substituted with a tertiary alkyl group having 4 to 8 carbon atoms, and n represents 3 or 4.

Tetramine compound and organic EL device

The present invention provides a tetramine compound represented by the following general formula (1): wherein R1, R2 and R3, which may be the same or different, each represents a hydrogen atom, a tertiary alkyl group having 4 to 8 carbon atoms, an unsubstituted aryl group or an aryl group substituted with a tertiary alkyl group having 4 to 8 carbon atoms, and n represents 3 or 4.

The present invention provides a tetramine compound represented by the following general formula (1): wherein R1, R2 and R3, which may be the same or different, each represents a hydrogen atom, a tertiary alkyl group having 4 to 8 carbon atoms, an unsubstituted aryl group or an aryl group substituted with a tertiary alkyl group having 4 to 8 carbon atoms, and n represents 3 or 4. According to the invention, there can be provided a material suitable as a material for an organic EL element requiring luminous stability at the time of high temperature driving which has been the largest problem of the conventional organic EL element. Further, an organic EL element containing the above-mentioned tetramine compound and a method for producing the above-mentioned tetramine compound are also disclosed.

The present invention provides p-terphenyl compounds represented by the following general formula (1) and (2): and an electrophotographic photoconductor containing the compound. According to the invention, a charge transporting agent having improved solubility in an organic solvent and an electrophotographic photoconductor excellent in drift mobility and having high sensitivity and high durability are provided.

P-terphenyl compound and photosensitive body for electrophotography using such compound

An organic electroluminescent device comprising a light-emitting layer between a pair of electrodes, the light-emitting layer comprising a mixture of a hole-transporting material consisting of a tertiary amine compound, an electron-transporting material and a light-emitting additive material, in which the tertiary amine compound has two or more oxidation potentials determined by a cyclic voltammetry wherein a potential difference between the first oxidation potential and the second oxidation potential in the oxidation potentials is 0.22V or more, and a glass transition temperature of at least 100&#xb0; C., and the electron-transporting material has a glass transition temperature of at least 100&#xb0; C.

Organic EL devices and production process thereof

A method for producing a charge controlling agent comprisinig a reaction product of an aromatic hydroxycarboxylic acid and a calcium compound bonded by at least one bondinig system selected from the group consisting of coordinate bonding, covalent bonding and ionic bonding, characterized in that the aromatic hydroxycarboxylic acid and the calcium compound are reacted by dropwise adding a solution of the aromatic hydroxycarboxylic acid to a solution of the calcium compound as a metal-imparting agent, a charge controlling agent produced by said method, which has a shape coefficient (SF-1) average value of at most 250 and a shape coefficient (SF-2) average value of at most 200, and an electrostatic image developing toner containing said charge controlling agent having a presence ratio on a toner surface of at least 2.0 mg/1 g of toner.

Charge controlling agent, method for producing the same and toner for developing electrostatic image

Electrophotographic photoreceptor

An electrophotographic photoconductor includes an electroconductive support, and a photoconductive layer formed thereon containing as an effective component an aromatic polycarbonate resin having a structural unit of formula (I), two structural units of formulae (I) and (II), or a repeat unit of formula (III):

Electrophotographic photoconductor and aromatic polycarbonate resin for use therein

An electrophotographic photoconductor includes an electroconductive support, and a photoconductive layer formed thereon containing as an effective component an aromatic polycarbonate resin having a repeat unit of formula (I), or two repeat units of formulae (II) and (III):

An electrophotographic photoconductor includes an electroconductive support, and a photoconductive layer formed thereon containing as an effective component an aromatic polycarbonate resin having a repeat unit of formula (I), or two repeat units of formulae (II) and (III): ##STR1## wherein Ar.sup.1 to Ar.sup.6, X, n, k and j are as specified in the specification.

Electrophotographic photoconductor and aromatic polycarbonate resin for

An electrophotographic photoconductor includes an electroconductive support, and a photoconductive layer formed thereon containing as an effective component an aromatic polycarbonate resin having a structural unit of formula (I), two structural units of formulae (I) and (II), or a repeat unit of formula (III): ##STR1## wherein Ar.sup.1 to Ar.sup.7, Y, X, and n are as specified in the specification.

An aromatic polycarbonate containing a structural unit of the formula: ##STR1## wherein R.sup.1 is a hydrogen atom, a substituted or unsubstituted alkyl group or a substituted or unsubstituted aryl group, Ar.sup.1 is a substituted or unsubstituted aryl group and Ar.sup.2 and Ar.sup.3 are independently a substituted or unsubstituted arylene group. The aromatic polycarbonate is capable of transferring charges and is used for forming a photosensitive layer of an electrophotographic photosensitive medium.

Aromatic polycarbonate and electrophotographic photosensitive medium

An electrophotographic photoconductor includes an electroconductive support, and a photoconductive layer formed thereon containing as an effective component an aromatic polycarbonate resin having a repeat unit of formula (I), or two repeat units of formulae (II) and (III): wherein Ar.sup.1 to Ar.sup.5, X, n, k and j are as specified in the specification.

Growing community of inventors

Kawasaki, Japan

Mitsutoshi Anzai