Hodogaya Chemical Co., Ltd.

Ricoh Company, Ltd.

Denso Corporation

Richoh Company, Ltd.

Atsushi Takesue

Mitsutoshi Anzai

Makoto Koike

Katsumi Abe

Takanobu Watanabe

Shinya Nagai

Takehiro Nakajima

Chieko Inayoshi

Shigeru Kusano

Yasuo Murakami

Masaomi Sasaki

Tomoyuki Shimada

Tamotsu Aruga

Masafumi Ohta

Jun Watanabe

Hideyuki Otsuka

Tetsuya Kato

Kazushige Kojima

Yoshihiko Abe

Kanae Hiraishi

Kiyokazu Takaso

Kanae Otsuka

Shunsuke Saitoh

A process for producing a charge control agent comprising an azo-based iron complex salt compound as an effective component, comprises: The ironization reaction of the monoazo compound is carried out while pH is kept at 7.0 to 8.0. Since the above azo-based iron complex salt compound having high purity can be obtained at a high yield, it can be used as a charge control agent directly and a special purification step can be eliminated, thereby making it possible to greatly cut the production cost.

Process for producing a charge control agent

An object of the present invention is to provide an electrophotographic photosensitive body having improved electrophotographic characteristics such as sensitivity and residual potential and also having excellent durability. The present invention provides an electrophotographic photosensitive body having a layer containing at least one specific p-terphenyl compound and at least one polycarbonate resin represented by the general formula (I): in a mass ratio of the p-terphenyl compound to the polycarbonate resin within the range of 2:8 to 7:3.

Electrophotographic photosensitive body

An object of the invention is to provide a method of making a p-terphenyl compound mixture which includes two symmetric p-terphenyl compounds respectively represented by formula (1) and formula (2) and an asymmetric p-terphenyl compound represented by formula (3) 

p-Terphenyl compound mixture and electrophotographic photoreceptors made by using the same

An object of the invention is to provide: a p-terphenyl compound mixture useful as a charge-transporting agent which has improved solubility in organic solvents to thereby diminish a cracking phenomenon, which poses problems concerning photoreceptor characteristics, and can realize an electrophotographic photoreceptor having high sensitivity and high durability; and an electrophotographic photoreceptor employing the compound mixture. The invention relates to: a p-terphenyl compound mixture which includes two symmetric p-terphenyl compounds respectively represented by the following general formula (1) and general formula (2) and an asymmetric p-terphenyl compound represented by the following general formula (3) which has both a group of substituents of the compound represented by general formula (1) and a group of substituents of the compound represented by general formula (2); and an electrophotographic photoreceptor containing the compound mixture. 

P-terphenyl compound mixture and electrophotographic photoreceptors made by using the same

An object of the invention is to provide a photoreceptor for electrophotography which has a low residual potential in an initial stage, is inhibited from increasing in residual potential, is prevented from decreasing in charge potential, and undergoes little fatigue deterioration even upon repeated use. The invention relates to a photoreceptor for electrophotography which has a photosensitive layer containing a cyclic phenol sulfide represented by the following general formula (1): and one or more charge-transporting agents each having an arylamino group in the molecule, and which has excellent durability.

Photoreceptor for electrophotography

An object of the invention is to provide a photoreceptor for electrophotography which has a low residual potential in an initial stage, is inhibited from increasing in residual potential, is prevented from decreasing in charge potential, undergoes little fatigue deterioration even upon repeated use, and is less apt to pose a problem concerning toxicity or environmental pollution. The invention relates to a photoreceptor for electrophotography which has a photosensitive layer containing an aromatic hydroxycarboxylic acid metal complex represented by the following general formula (1): and one or more charge-transporting agents each having an arylaminophenyl group in the molecule.

An object of the present invention is to provide an electrophotographic photoreceptor which is not impaired in electrophotographic properties such as charge potential and residual potential and which is also excellent in repetition stability. The invention relates to an electrophotographic photoreceptor including a conductive support having thereon a photosensitive layer containing a zirconium compound represented by the following general formula (1): and one or more charge transport agents having an arylamino group in its molecule.

An object of the present invention is to provide an electrophotographic photosensitive body which is not impaired in electrophotographic characteristics such as charged potential and residual potential, and which is also excellent in repeating stability. The present invention provides an electrophotographic photosensitive body including a conductive support having thereon a layer containing a specific p-terphenyl compound and at least one additive.

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 process for producing a hydrazone compound represented by the general formula (5): which comprises a step of condensing a hydrazine compound represented by the general formula (3): with a carbonyl compound represented by the general formula (4): without taking the hydrazine compound out of a reactor. According to the invention, the target hydrazone compound can be obtained in high quality and in a high yield without taking the hydrazine compound out of the reactor at all, the hydrazine compound being a reaction intermediate which is structurally unstable and has a fear of influencing safety of workers owing to its toxicity (mutagenicity).

Process for producing hydrazone compound

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.

Growing community of inventors

Fukushima, Japan

Atsushi Takesue