Electrophotographic photoreceptor, process for producing same, and electrophotographic device

Abstract

Provided are an electrophotographic photoreceptor which even in long-term use, gives images having no defects and has excellent wear performance, a process for producing the photoreceptor, and an electrophotographic device. The electrophotographic photoreceptor includes a photosensitive layer formed over an electroconductive base. When the average film density of the outermost surface layer is plotted as ordinate and the boiling point of a solvent used for forming the outermost surface layer is plotted as abscissa, a straight line is obtained, the straight line having a slope k of 1.50E-4 (g / cm3 DEG C) or greater. The difference between the film density of the portion of the outermost surface layer which is located on the surface side and the film density of the portion thereof located onthe side near to the electroconductive base is 0.030 g / cm3 or less.

Description

technical field [0001] The present invention relates to electrophotographic photoreceptors (hereinafter also simply referred to as "photoreceptors") used in electrophotographic printers, copiers, facsimiles, etc. An electrophotographic photoreceptor having excellent stain resistance, electrical characteristic stability, and abrasion resistance, a manufacturing method thereof, and an electrophotographic device. Background technique [0002] A photoreceptor for electrophotography adopts a basic structure in which a photosensitive layer having a photoconductive function is provided on a conductive substrate. In recent years, research and development on photoreceptors for organic electrophotography using organic compounds as functional components responsible for generation and transport of electric charges has been actively carried out due to the advantages of diversity of materials, high productivity, safety, etc., and in copiers And applications in printers, etc. are also in ...

AI Technical Summary

Problems solved by technology

Under such circumstances, the demand for photoreceptors with small fluctuations in image characteristics and electrical characteristics due to repeated use and fluctuations in the use environment (room temperature and environment) has become significantly higher. According to the existing technology, it is impossible to fully satisfy these requirements at the same time. Require

[0007] In addition, in the photoreceptor, in addition to ozone and nitrogen oxides generated during charging, the surface of the photoreceptor is sometimes contaminated by contact members such as paper and rollers.

In this case, in addition to the image flow (Japanese: 图图流れ) caused by the pollutant itself, there are also the following problems: the attached substance reduces the lubricity of the surface of the photoreceptor; it is easy to adhere to paper powder or toner; it is easy to cause scraping Chirping or turning over, surface abrasions, etc.

For example, in Patent Documents 2 and 3, a polycarbonate resin containing a specific structure is proposed, but studies on compatibility with various charge transport agents or additive materials and solubility of the resin are insufficient.

In addition, in Patent Document 4, a polycarbonate resin containing a specific structure is proposed, but in a resin having a bulky structure, the space between polymers is large, and discharge substances, contact members, foreign objects, etc. during charging are easy to Penetrates the photosensitive layer, so it is difficult to obtain sufficient durability

In addition, in order to improve the printing resistance and coating property, a polycarbonate with a special structure is proposed in Patent Document 5, but there are insufficient descriptions related to the combined charge transport material and additives, and there are difficulties in long-term use. Technical Issues in Maintaining Stable Electrical Characteristics

[0010] In addition, in Patent Documents 7 and 8, proposals related to the improvement of the abrasion resistance of the photosensitive layer are also proposed, but the effect has not been sufficiently examined regarding image defects of the photosensitive layer.

In addition, Patent Document 9 discloses a technique related to the surface layer of the photosensitive layer, and Patent Document 10 discloses that the charge generation layer is discontinuous at least at one end, and the charge generation layer is completely covered with the charge transport layer. technology, but there is no discussion on issues related to image defects

In addition, Patent Document 11 discloses a technique in which a photosensitive layer contains a copolymer of a predetermined triarylaminoacrylate monomer and a predetermined divinyl compound, but does not discuss the film density and image defects of the photosensitive layer.

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