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Coating liquid for electrophotographic photosensitive body, electrophotographic photosensitive body, and electrophotographic photosensitive body cartridge

An electrophotography and photoreceptor technology, applied in optics, electrography, instruments, etc., can solve the problems of high crystallinity, poor solution stability, insufficient solution stability, etc., and achieve excellent liquid stability and excellent mechanical durability. Effect

Inactive Publication Date: 2009-12-16
MITSUBISHI CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Polycarbonate resins have a repeating structure derived from aromatic polyols in their repeating structure, and among them, copolycarbonates having a repeating structure derived from 2,2-bis(4-hydroxyphenyl)propane are often used resin, but it has the following problems: due to the high crystallinity of this structure, the solution stability is poor, when it is used as a solution dissolved in a solvent, although a uniform solution can be obtained in the initial stage of just dissolving, but with the crystallization Gradually, the gel component is easy to increase
[0007] When using a halogen-based solvent containing a halogen atom in the molecule, the problem of crystallization can sometimes be solved. Although the crystals are dissolved in several kinds of halogen-based solvents, this method is not preferred from the viewpoint of environmental protection in recent years.
In addition, there is an example of dissolving a copolymer in tetrahydrofuran as in Japanese Patent Publication No. 7-27223, but the solution stability is still insufficient.

Method used

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  • Coating liquid for electrophotographic photosensitive body, electrophotographic photosensitive body, and electrophotographic photosensitive body cartridge
  • Coating liquid for electrophotographic photosensitive body, electrophotographic photosensitive body, and electrophotographic photosensitive body cartridge
  • Coating liquid for electrophotographic photosensitive body, electrophotographic photosensitive body, and electrophotographic photosensitive body cartridge

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0075] As the preparation method of polycarbonate resin, the method of (3) is often used. First, an oligomer of 1 monomer to dozens of monomers (weight body) is formed by polymerizing bisphenol monomers, and then the low polymer is further polymerized polymers to prepare desired polycarbonate resins. When synthesizing a copolymer, it can be performed by polymerizing two types of oligomers. When this production method is employed, a unit sequence (block) formed of the same bisphenol unit is formed at the time of oligomer synthesis. This copolymer is called a block copolymer.

[0076] Since the copolymerized polycarbonate resin of the present invention has the repeating structure shown in the formula (1) of the present invention, it has the characteristics of easy crystallization, and the repeating structure shown in the formula (1) of the present invention repeats as a block structure When , crystallization is more likely to occur, so it is preferable to have less block struc...

Embodiment

[0189] Hereinafter, the present invention will be described more specifically based on examples. The following examples are merely examples for explaining the present invention in detail, and the present invention is not limited to the following examples within the scope not exceeding the gist thereof. In addition, description of "parts" in the following Examples, Comparative Examples, and Reference Examples means "parts by weight" unless otherwise specified.

[0190]

[0191] First, the measurement of the viscosity average molecular weight will be described.

[0192] The polycarbonate resin was dissolved in dichloromethane to prepare a solution having a concentration C of 6.00 g / L. Flow time t using solvent (dichloromethane) 0 The flow-down time t of the sample solution was measured in a constant temperature water bath set at 20.0° C. with an Ubbelode capillary viscometer of 136.16 seconds. The viscosity average molecular weight Mv was calculated from the following formu...

manufacture example

[0199] 100 parts (0.438mol) of 2,2-bis(4-hydroxyphenyl)propane (called bisphenol A), 45.6 parts (1.14mol) of sodium hydroxide, 848 parts of water, 0.336 parts of sodium bisulfite, two A mixture of 432 parts (325 mL) of methyl chloride was placed in a reaction tank equipped with a stirrer and stirred. The temperature of the reaction tank was maintained between 0°C and 10°C, and 110 parts (1.11 mol) of carbonyl chloride was blown thereinto for about 6 hours to perform a reaction. After the reaction, only the dichloromethane solution containing polycarbonate oligomers was collected. The analysis results of the dichloromethane solution of the obtained oligomer are as follows.

[0200] Oligomer concentration (Note 1): 21.9% by weight

[0201] Terminal chloroformate group concentration (Note 2): 0.420 equivalent

[0202] Terminal phenolic hydroxyl concentration (Note 3): 0.026 equivalent

[0203] (Note 1): The solution was evaporated to dryness for measurement.

[0204] (Note 2...

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Abstract

Disclosed is a coating liquid for producing an electrophotographic photosensitive body, which is excellent in electrical characteristics and mechanical durability, while being excellent in coatability and liquid stability. Also disclosed are an electrophotographic photosensitive body produced by using such a coating liquid, an image-forming device comprising such an electrophotographic photosensitive body, and an electrophotographic photosensitive body cartridge. Specifically disclosed is a coating liquid for producing an electrophotographic photosensitive body, which is characterized by containing a copolymerized polycarbonate resin and asolvent A having a boiling point of not less than 80 DEG C but not more than 150 DEG C. The copolymerized polycarbonate resin has a repeating unit represented by the formula (1) below, while containing not more than 10% by weight of a repeating unit having a biphenyl structure. The average of repetitions of the unit represented by the formula (1) is not more than 10.

Description

technical field [0001] The present invention relates to an electrophotographic photoreceptor used in copiers, printers, and the like, and a coating liquid for manufacturing the electrophotographic photoreceptor. Background technique [0002] Electrophotographic technology is widely used in copiers, various printers, and the like because real-time, high-quality images and the like can be obtained. [0003] In addition, as a photoreceptor which becomes the core of electrophotography technology, a photoreceptor having an organic photoconductive material having advantages such as non-pollution, easy film formation, and easy manufacture is used. [0004] As photoreceptors using organic photoconductive materials, so-called dispersion photoreceptors in which photoconductive fine powder is dispersed in a binder resin, and laminated photoreceptors in which a charge generating layer and a charge transporting layer are laminated are known. . The multilayer photoreceptor has become th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03G5/05
CPCG03G5/14756G03G5/0564G03G5/05
Inventor 水岛直高村宽昭齐田敦朗
Owner MITSUBISHI CHEM CORP
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