Electrophotographic photoconductor, image forming apparatus, and process cartridge

An electrophotography and photoreceptor technology, which is applied to the electrical recording process using the charge pattern, the equipment and optics of the electrical recording process using the charge pattern, and can solve the problem of low charging stability of the single-layer photoreceptor, residual potential difference, and inability Eliminates problems such as potential differences, suppresses deterioration of photoreceptor characteristics or generation of afterimages, stabilizes characteristics such as chargeability, and has excellent charge transport functions

Inactive Publication Date: 2007-10-24
RICOH KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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 ...

Method used

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  • Electrophotographic photoconductor, image forming apparatus, and process cartridge
  • Electrophotographic photoconductor, image forming apparatus, and process cartridge
  • Electrophotographic photoconductor, image forming apparatus, and process cartridge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0227] Metal-free phthalocyanine was dispersed under the following composition and conditions to prepare a pigment dispersion.

[0228] Metal Free Phthalocyanine Pigments

[0229] (Manufactured by Dainippon Inki Industry Co., Ltd.: Fastogen Blue8120B): 3 servings

[0230] Cyclohexanone 97 parts

[0231] These were put into a glass pot with a diameter of 9 cm, and dispersed with PSZ balls with a diameter of 0.5 mm at a rotation speed of 100 rpm for 5 hours to prepare a pigment dispersion liquid.

[0232] A coating liquid for a photosensitive layer having the composition described below was prepared using the pigment dispersion liquid.

[0233] Pigment dispersion: 60 parts

[0234] The electron transport material of compound 1-1 listed: 25 parts

[0235] The hole-transporting material of the enumerated compound 2-1: 25 parts

[0236] Z-type polycarbonate resin (manufactured by Teijin Chemicals: Panlite TS-2050): 50 parts

[0237] Silicone oil (manufactured by Shin-Etsu Che...

Embodiment 2

[0241] A photoreceptor (as photoreceptor 2 ).

[0242] (Titanyl phthalocyanine used in Example 2)

[0243] A pigment was produced based on JP-A-2001-19871. That is, 29.2 g of 1,3-diiminoisoindoline and 200 ml of sulfolane were mixed, and 20.4 g of tetrabutoxytitanium was added dropwise under a nitrogen stream. After the dropwise addition, the temperature was slowly raised to 180° C., the reaction temperature was kept between 170° C. and 180° C., and the reaction was carried out with stirring for 5 hours. After the reaction, cool naturally, then filter the precipitate, wash with chloroform until the powder turns blue, then wash several times with methanol, then wash several times with hot water at 80°C, and then dry to obtain crude titanyl phthalocyanine. Thick titanyl phthalocyanine is dissolved in the vitriol oil of 20 times of amount, then is added dropwise to the ice water of 100 times of amount while stirring, the crystallization that separates out is filtered, then rep...

Embodiment 3～15

[0255] Photoreceptors (photoreceptors 3 to 15) were produced in the same manner as in Example 2 except that the electron transport material and hole transport material used in Example 2 were changed to those shown in Table 3.

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PUM

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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...

Claims

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Application Information

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IPC IPC(8): G03G5/06G03G5/04G03G21/18G03G15/00
Inventor 下山启介栗本锐司河村慎一
Owner RICOH KK
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