Electrophotographic photoconductor, image forming apparatus, and process cartridge

Abstract

An electrophotographic photoconductor contains a photosensitive layer and a conductive substrate, wherein the photosensitive layer is disposed on the conductive substrate, and the photosensitive layer is a single layer containing a charge generating material, an electron transporting material expressed by the General Formula (1) and a hole transporting material expressed by the General Formula (2): wherein R1 and R2 independently represent any one of a hydrogen atom, substituted or unsubstituted alkyl group, substituted or unsubstituted cycloalkyl group and substituted or unsubstituted aralkyl group, and R3, R4, R5, R6, R7, R8, R9 and R10 independently represent any one of a hydrogen atom, halogen atom, cyano group, nitro group, amino group, hydroxyl group, substituted or unsubstituted alkyl group, substituted or unsubstituted cycloalkyl group and substituted or unsubstituted aralkyl group; and wherein R11, R12, R13, R14, R17, R18, R19 and R20 each represents a hydrogen atom, halogen atom, alkoxy group, alkyl group which may be substituted or aryl group which may be substituted, R15 and R16 each represents a hydrogen atom, halogen atom, alkyl group, and alkoxy group.

Description

technical field [0001] The present invention relates to a single-layer electrophotographic photoreceptor containing at least a specific electron transport material and a hole transport material in a photosensitive layer. [0002] In addition, the present invention relates to a positively charging type electrophotographic photoreceptor containing a specific charge transport in a single photosensitive layer, a positively charging type image forming apparatus using the photoreceptor, and a process cartridge. The combination of materials and organic sulfur-based antioxidants does not produce abnormal images such as afterimages even after repeated use. Background technique [0003] In recent years, the development of information processing systems using electrophotography has been remarkable. In particular, optical printers that convert information into digital signals and then record information with light have significantly improved their printing quality and reliability. Thi...

AI Technical Summary

Problems solved by technology

In the case of a single-layer photoreceptor, since it contains an electron transport material and a hole transport material, it has sensitivity to both positive and negative polarities. Therefore, even if the charge is opposite to the polarity, it can be eliminated to some extent by photoelimination. However, it cannot be completely eliminated, and the potential difference will remain anyway

If the charging ability of the photoreceptor is sufficient, the potential difference can be eliminated in the next charging step, so that uniform charging can be achieved, but when the charging ability is low, the potential difference cannot be eliminated in the next charging, and the front surface remains in the image below. traces of the image

Single-layer photoreceptors are prone to residual images due to repeated use due to low charging stability

[0019] When the electron transport material represented by the general formula (1) is used, although the sensitivity characteristics of the single-layer photoreceptor are greatly improved, as with the conventional single-layer photoreceptor, there is a problem in chargeability, and it is easy to be damaged due to repeated use. And produce residual image etc., therefore, the status quo is not able to obtain satisfactory results

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