# US 5,344,736 A · Disazo electrophotographic photoreceptor

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- Number: US 5,344,736 A
- Document ID: US5344736A
- Status: Granted
- Kind: A
- Application number: 08/025,170
- Filed: 1993-03-02
- Granted: 1994-09-06
- Earliest claimed: 1993-03-02
- Assignees: Dainichiseika Color & Chemicals Mfg. Co., Ltd.
- Inventors: Nakaji Komiyama; Hisao Kouno; Kazuhiro Higashide; Osamu Suda; Masaru Hasegawa
- Web page: https://patentgrep.com/patent/US5344736A

## CPC

- G03G 5/0683: {containing polymethine or anthraquinone groups}
- C09B 35/033: in which the coupling component is an arylamide of an o-hydroxy-carboxylic acid or of a beta-keto-carboxylic acid
- G03G: ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- C09B: ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES {, e.g. PIGMENTS}; MORDANTS; LAKES (fermentation or enzyme using processes to synthesise a desired chemical compound C12P)

## Abstract

An electrophotographic photoreceptor is provided with a photosensitive layer, which contains an azo compound represented by the following g general formula (1): ##STR1## wherein A means a coupler residuum having phenolic OH radicals, R.sub.1 and R.sub.2 designate, respectively, a radical of an integer of, both, m=0.about.4, n =0.about.4, selected from the group consisting of hydrogen, halogen atoms, alkyl group, alkoxy group, and di-substituted amino group. The electrophotographic photoreceptor of this invention has excellent electrification characteristics, sensitivity characteristics and image-forming property as well as good sensitivity. In addition, its sensitivity and electrification characteristics undergo less variations even when employed repeatedly. It also undergoes little light-induced fatigue. It has high weatherability.

## Claims

### Claim 1

In an electrophotographic photoreceptor having a photosensitive layer on a conductive substrate, said photosensitive layer comprising a carrier producing substance and a carrier transporting substance, the improvement wherein said carrier producing substance is composed of an azo compound represented by the following general formula (1): ##STR68## wherein A means a coupler residuum having phenolic OH radicals, R.sub.1 and R.sub.2 designate, respectively, a radical of an integer of, both, m=0.about.4, n=0.about.4, selected from the group consisting of hydrogen, halogen atoms, alkyl group, alkoxy group, and di-substituted amino group.

### Claim 2 (depends on 1)

The photoreceptor as claimed in claim 1, wherein the carrier producing substance is composed of an azo compound represented by the following basical structure, ##STR69## wherein A means a coupler residuum having phenolic OH radicals.

### Claim 3 (depends on 1)

The photoreceptor as claimed in claim 1, wherein the carrier producing substance is composed of an azo compound represented by the following basical structure, ##STR70## wherein A means a coupler residuum having phenolic OH radicals.

### Claim 4 (depends on 1)

The photoreceptor as claimed in claim 1, wherein the carrier producing substance is composed of an azo compound represented by the following basical structure, ##STR71## wherein A means a coupler residuum having phenolic OH radicals.

### Claim 5 (depends on 1)

The photoreceptor as claimed in claim 1, wherein the carrier producing substance is composed of an azo compound represented by the following basical structure, ##STR72## wherein A means a coupler residuum having phenolic OH radicals.

### Claim 6 (depends on 1)

The photoreceptor as claimed in claim 1, wherein the carrier producing substance is composed of an azo compound represented by the following basical structure, ##STR73## wherein A means a coupler residuum having phenolic OH radicals.

### Claim 7 (depends on 1)

The photoreceptor as claimed in claim 1, wherein the carrier producing substance is composed of an azo compound represented by the following basical structure, ##STR74## wherein A means a coupler residuum having phenolic OH radicals.

### Claim 8 (depends on 1)

The photoreceptor as claimed in claim 1, wherein the carrier producing substance is composed of an azo compound represented by the following basical structure, ##STR75## wherein A means a coupler residuum having phenolic OH radicals.