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Electrophotographic photosensitive member, process cartridge and electrophotographic apparatus, and phthalocyanine crystal

A technology of electrophotography and photosensitive components, which is applied in the fields of optics, electrical recording, instruments, etc., and can solve the problems of increasing the possibility of ghosting phenomenon, etc.

Inactive Publication Date: 2016-04-20
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the method disclosed in PTL 3, the addition of a urea-based compound that improves photosensitivity also increases the number of photocarriers remaining in the charge generation layer, thereby increasing the possibility of the ghost phenomenon

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-1

[0168] Hydroxygallium phthalocyanine was prepared in the same manner as (Synthesis Example 1) and (Example 1-1) described in Japanese Patent Laid-Open No. 2011-94101. 0.5 parts of hydroxygallium phthalocyanine, 0.5 parts of exemplary compound (1) (product model: D0712, manufactured by Tokyo Chemical Industry Co., Ltd.) and 9.5 parts of N,N-dimethylformamide were mixed at room temperature (23° C.) 15 parts of glass beads with a diameter of 0.8 mm were ground in a ball mill for 52 hours. Hydroxygallium phthalocyanine crystals were extracted from the dispersion using N,N-dimethylformamide and filtered off. The filter was thoroughly washed with N,N-dimethylformamide and then tetrahydrofuran. The filtered residue was dried under vacuum to obtain 0.43 parts of hydroxygallium phthalocyanine crystals. figure 2 An X-ray powder diffraction pattern of a hydroxygallium phthalocyanine crystal is shown.

[0169] Based on the proton ratio measured by NMR, Exemplary Compound (1) constitut...

Embodiment 1-2

[0171] 0.46 parts of hydroxygallium phthalocyanine crystals were prepared in the same manner as in Example 1-1 except that the amount of the exemplary compound (1) was changed from 0.5 parts to 1.0 parts. X-ray powder diffraction patterns of hydroxygallium phthalocyanine crystals and figure 2 same as shown in .

[0172] NMR measurement showed that Exemplary Compound (1) constituted 0.18% by mass of the crystals and N,N-dimethylformamide constituted 1.97% by mass of the crystals.

Embodiment 1-3

[0174] 0.48 parts of hydroxygallium phthalocyanine were prepared in the same manner as in Example 1-1, except that 0.5 parts of the exemplary compound (1) was replaced by 0.2 parts of the exemplary compound (7) prepared in Production Example 2 crystals. X-ray powder diffraction patterns of hydroxygallium phthalocyanine crystals and figure 2 same as shown in .

[0175] Based on the proton ratio measured by NMR, Exemplary Compound (19) constituted 0.20% by mass of the phthalocyanine crystal and N,N-dimethylformamide constituted 2.08% by mass of the phthalocyanine crystal. Since Exemplary Compound (7) is solid and hardly soluble in N,N-dimethylformamide, Exemplary Compound (7) was subjected to TG measurement. The TG measurement showed that the weight loss increased at a temperature of 450° C. or higher than the evaporation temperature (200° C. to 340° C.) of Exemplary Compound (7) alone. This means that the exemplary compound (7) is contained in the phthalocyanine crystal.

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Abstract

A photosensitive layer comprises: a phthalocyanine crystal in which a urea compound is contained. The urea compound has one or more urea moieties comprising: a carbonyl group, or a thiocarbonyl group, and two nitrogen atoms. Each of the two nitrogen atoms connects to a hydrogen atom, an alkyl group, an unsubstituted or substituted aryl group, or an unsubstituted or substituted arylene group. At least one of the nitrogen atoms connects to an unsubstituted or substituted aryl group.

Description

technical field [0001] The present invention relates to an electrophotographic photosensitive member, a process cartridge and an electrophotographic apparatus each including the electrophotographic photosensitive member, and a phthalocyanine crystal. Background technique [0002] The long lasing wavelength of semiconductor lasers widely used as image exposure means in the field of electrophotography is in the range of 650 to 820 nm. Therefore, electrophotographic photosensitive members having sensitivity to such long-wavelength light have been developed. [0003] Phthalocyanine pigments are effective charge-generating substances having high sensitivity to light in such a long-wavelength region. In particular, oxytitanium phthalocyanine and gallium phthalocyanine have excellent sensitivity characteristics, and various crystal forms of oxytitanium phthalocyanine and gallium phthalocyanine have been reported. [0004] Although an electrophotographic photosensitive member incl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03G5/06G03G5/05C07C275/28C07C275/32C07C335/16
CPCC07C275/28C07C275/30C07C275/32C07C275/40C07C335/16G03G5/047G03G5/0542G03G5/0564G03G5/0612G03G5/0696G03G5/06142
Inventor 田中正人
Owner CANON KK