Electrophotographic photoreceptor, electrophotographic photoreceptor cartridge, and image-forming apparatus
a photoreceptor and electrophotographic technology, applied in the direction of electrographic process apparatus, instruments, optics, etc., can solve the problems of limited digital image apparatus, gradual deterioration of photosensitive layer, etc., to achieve high sensitivity, stably form high-resolution high-quality images, and high-resolution high-quality images
Active Publication Date: 2013-05-28
MITSUBISHI CHEM CORP
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- Application Information
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Benefits of technology
[0090]The metal oxide particles may have any desired crystal form unless they considerably lessen the effects of the invention. For example, metal oxide particles made of titanium oxide as the metal oxide (i.e., titanium oxide particles) are not limited in crystal form, and any of rutile, anatase, brookite, and amorphous ones can be used. Furthermore, with respect to the crystal form of titanium oxide particles, the particles may include ones having two or more crystal states among those different crystal states.
[0091]Moreover, the surface of the metal oxide particles may be subjected to various surface treatments. For example, a treatment with, e.g., an inorganic substance such as tin oxide, aluminum oxide, antimony oxide, zirconium oxide, or silicon oxide or an organic substance such as stearic acid, a polyol, or an organosilicon compound may be performed.
[0092]Especially when titanium oxide particles are used as the metal oxide particles, it is preferred that the titanium oxide particles have undergone a surface treatment with an organosilicon compound. Examples of the organosilicon compound include silicone oils such as dimethylpolysiloxane and methylhydrogenpolysiloxane; organosilanes such as methyldimethoxysilane and diphenyldimethoxysilane; silazanes such as hexamethyldisilazane; and silane coupling agents such as vinyltrimethoxysilane, γ-mercaptopropyltrimethoxysilane, and γ-aminopropyltriethoxysilane.
[0093]It is especially preferred that metal oxide particles should be treated with a silane treating agent represented by the structure of the following formula (i). This silane treating agent has satisfactory reactivity with metal oxide particles and is a satisfactory treating agent.
[0095]In formula (i), Ru1 and Ru2 each independently represent an alkyl group. The number of carbon atoms in each of Ru1 and Ru2 is not limited. However, the number thereof is generally 1 or larger and is generally 18 or smaller, preferably 10 or smaller, more preferably 6 or smaller, especially preferably 3 or smaller. This brings about an advantage that suitable reactivity with metal oxide particles is obtained. When the number of carbon atoms in Ru1 and Ru2 is too large, there are cases where this treating agent has reduced reactivity with metal oxide particles or the metal oxide particles after treatment therewith have reduced dispersion stability in a coating fluid.
[0096]Example of Ru1 and Ru2 include methyl, ethyl, and propyl. In formula (i), Ru3 represents an alkyl group or an alkoxy group. The number of carbon atoms in Ru3 is not limited. However, the number thereof is generally 1 or larger and is generally 18 or smaller, preferably 10 or smaller, more preferably 6 or smaller, especially 3 or smaller. This brings about an advantage that suitable reactivity with metal oxide particles is obtained. When the number of carbon atoms in Ru3 is too large, there are cases where this treating agent has reduced reactivity with metal oxide particles or the metal oxide particles after treatment therewith have reduced dispersion stability in a coating fluid.
Problems solved by technology
So far, the apparatus which digitally form images have been limited to the laser printers or LED printers as output apparatus for word processors or personal computers and to some kinds of color laser copiers, etc.
Especially in repetitions of use in copiers or printers, there is a problem that the photosensitive layer deteriorates gradually.
Method used
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Experimental program
Comparison scheme
Effect test
production example 1
[0325]Rutile-form titanium oxide having an average primary-particle diameter of 40 nm (“TTO55N” manufactured by Ishihara Sangyo Kaisha, Ltd.) was introduced into a high-speed flow type mixing / kneading machine (“SMG300” manufactured by Kawata MFG. Co., Ltd.) together with 3% by mass methyldimethoxysilane (“TSL8117” manufactured by Toshiba Silicone Co., Ltd.) based on the titanium oxide. The ingredients were mixed together at a high speed of 34.5 m / sec in terms of peripheral rotation speed. The surface-treated titanium oxide obtained was dispersed in a mixed solvent composed of methanol and 1-propanol in a ratio of 7 / 3 by mass with a ball mill to thereby obtain a dispersion slurry of the hydrophobized titanium oxide. This dispersion slurry was mixed with a methanol / 1-propanol / toluene mixed solvent and with pellets of the copolyamide described in an Example of JP-A-4-31870 composed of ε-caprolactam [compound represented by the following formula (A)] / bis(4-amino-3-methylcyclohexyl)metha...
production example 2
[0331]An electrophotographic photoreceptor was produced in the same manner as in Production Example 1, except that the compound represented by Exemplified Compound 1 used in Production Example 1 was used in an amount of 1.0 part by mass in place of 0.1 part by mass. Thus, an electrophotographic photoreceptor E2 was obtained.
production example 3
[0332]An electrophotographic photoreceptor was produced in the same manner as in Production Example 1, except that the following general formula (P-2: viscosity-average molecular weight, about 40,000; x:y:z=45 / 45 / 10) was used. Thus, an electrophotographic photoreceptor E3 was obtained.
[0333]
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The invention provides an electrophotographic photoreceptor for use in an image-forming apparatus comprising a charging unit which charges an electrophotographic photoreceptor, an exposure unit which exposes the charged electrophotographic photoreceptor to light to form an electrostatic latent image on the electrophotographic photoreceptor, and a developing unit which develops the electrostatic latent image, wherein the electrophotographic photoreceptor comprises a conductive substrate and a photosensitive layer and the photosensitive layer contains a compound represented by the following formula (1).
Description
TECHNICAL FIELD[0001]The present invention relates to electrophotographic photoreceptor and an electrophotographic photoreceptor cartridge each for use in copiers, printers, and the like and to image-forming apparatus.BACKGROUND ART[0002]Electrophotography, which was invented by C. F. Carlson, has advantages such as instantaneousness and the ability to give high-quality images having high storability. Because of this, electrophotography is extensively used not only in the field of copiers but in the field of various printers and facsimile. Recently, electrophotography has come to be extensively used also in digital multifunction appliances. Applications thereof are spreading widely. With respect to photoreceptors serving as the core of electrophotography, use is being mainly made of photoreceptors employing an organic photoconductive material which has advantages such as non-polluting properties, ease of film formation, and ease of production. Of these, the so-called multilayer type...
Claims
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IPC IPC(8): G03G5/00
InventorFUJIWARA, KUMIKOMITSUMORI, TERUYUKIFUJIWARA, HIROAKI
OwnerMITSUBISHI CHEM CORP