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Electrophotographic photosensitive member, manufacturing method of electrophotographic photosensitive member, process cartridge and electrophotographic apparatus, and phthalocyanine crystal and manufacturing method of phthalocyanine crystal

a manufacturing method and photosensitive technology, applied in the field of electrophotographic photosensitive members, can solve the problems of potential variation and difficulty in conversion to a desired crystalline form in some cases, and achieve the effect of reducing image defects

Inactive Publication Date: 2015-12-03
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patent is about improving the quality of images produced by an electrophotographic photosensitive member. The invention reduces image defects caused by ghosting, even in extreme conditions of low temperature and low humidity. The invention also provides a method for manufacturing the electrophotographic photosensitive member and a process cartridge and electrophotographic apparatus that use the improved photosensitive member. Additionally, the patent describes a new type of crystal that works well as a charge generating substance in the photosensitive member. Overall, this patent aims to improve the reliability and quality of images produced by electrophotographic devices.

Problems solved by technology

Although an electrophotographic photosensitive member using a phthalocyanine pigment has excellent sensitivity properties, a problem is that the generated photo carriers tend to remain in a photosensitive layer so as to act as a memory, easily causing potential variation such as ghosting.
This method has, however, problems that an additive (organic electron acceptor) may be subject to a chemical change and that the conversion to a desired crystalline form may be difficult in some cases.

Method used

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  • Electrophotographic photosensitive member, manufacturing method of electrophotographic photosensitive member, process cartridge and electrophotographic apparatus, and phthalocyanine crystal and manufacturing method of phthalocyanine crystal
  • Electrophotographic photosensitive member, manufacturing method of electrophotographic photosensitive member, process cartridge and electrophotographic apparatus, and phthalocyanine crystal and manufacturing method of phthalocyanine crystal
  • Electrophotographic photosensitive member, manufacturing method of electrophotographic photosensitive member, process cartridge and electrophotographic apparatus, and phthalocyanine crystal and manufacturing method of phthalocyanine crystal

Examples

Experimental program
Comparison scheme
Effect test

example 1-1

[0076]As described below, hydroxygallium phthalocyanine was produced by the same as in Synthesis Example 1 and Example 1-1 described in Japanese Patent Application Laid-Open No. 2011-94101. Under nitrogen flow atmosphere, 5.46 parts of phthalonitrile and 45 parts of α-chloronaphthalene were fed into a reaction tank, then heated up to a temperature of 30° C., and maintained at the temperature. Subsequently, 3.75 parts of gallium trichloride was fed thereto at the temperature (30° C.). At the feeding time, the mixture liquid had a water content of 150 ppm. The temperature was then increased to 200° C. Under the nitrogen flow atmosphere, a reaction was caused at a temperature of 200° C. for 4.5 hours, which was then cooled to a temperature of 150° C. for filtering a product. The produced residue was dispersed and cleaned with N,N-dimethylformamide at a temperature of 140° C. for 2 hours, and then filtrated. The produced residue was cleaned with methanol and dried to produce 4.65 parts ...

example 1-2

[0079]A hydroxygallium phthalocyanine crystal in an amount of 0.42 parts was obtained by the same treatment as in Example 1-1, except that the milling treatment time was changed from 1000 hours to 2000 hours in Example 1-1. The powder X-ray diffraction pattern of the produced crystal was the same as in Example 1-1. The angle and the intensity of the peak emerging at Bragg angle 2θ of 9.9°±0.2°, the intensity on a side 2.8° wider from the peak angle, and the ratio of the intensity are described in Table 1.

[0080]It was confirmed that 0.80% by mass N,N-dimethylformamide is contained relative to phthalocyanine in the phthalocyanine crystal by the NMR measurement.

example 1-3

[0081]A hydroxygallium phthalocyanine crystal in an amount of 0.44 parts was obtained by the same treatment as in Example 1-1, except that the milling treatment time was changed from 1000 hours to 500 hours in Example 1-1. The powder X-ray diffraction pattern of the produced crystal was the same as in Example 1-1. The angle and the intensity of the peak emerging at Bragg angle 2θ of 9.9°±0.2°, the intensity on a side 2.8° wider from the peak angle, and the ratio of the intensity are described in Table 1.

[0082]It was confirmed that 1.23% by mass N,N-dimethylformamide is contained relative to phthalocyanine in the phthalocyanine crystal by the NMR measurement.

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Abstract

The present invention provides: an electrophotographic photosensitive member which reduces image defects due to ghosting not only under a normal temperature and normal humidity environment but also even under a low temperature and low humidity environment; and a novel phthalocyanine crystal. The electrophotographic photosensitive member of the present invention comprises a photosensitive layer which comprises a phthalocyanine crystal in which a N,N-dimethylformamide is contained. The content of the N,N-dimethylformamide is 0.1% by mass or more and 1.5% by mass or less based on the phthalocyanine crystal.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to an electrophotographic photosensitive member, a manufacturing method of an electrophotographic photosensitive member, a process cartridge and an electrophotographic apparatus, and a phthalocyanine crystal and a manufacturing method of a phthalocyanine crystal.[0003]2. Description of the Related Art[0004]Since the oscillation wavelength of a semiconductor laser commonly used as an image exposing unit in the field of electrophotography is in the long wavelength range of 650 to 820 nm, electrophotographic photosensitive members having high sensitivity to the light in the long wavelength range are currently under development.[0005]Phthalocyanine pigments are effective as charge generating substances having high sensitivity to the light ranging to such a long wavelength region. Oxytitanium phthalocyanine and gallium phthalocyanine in particular have excellent sensitivity properties, and vario...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): G03G5/06C09B47/04
CPCC09B47/045G03G5/0696C09B67/0019C09B67/0026C30B1/12C30B7/14C30B29/54
Inventor KAWAHARA, MASATAKATANAKA, MASATOKUNO, JUMPEINISHIDA, TSUTOMUWATARIGUCHI, KANAME
Owner CANON KK
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