BR102013016913A2 - ELETROFOTOGRAPHIC PHOTOSENSITIVE COMPONENT, PROCESS CARTRIDGE, AND ELECTROPHOTOGRAPHIC MECHANISM - Google Patents

Abstract

Electrophotographic photosensitive component, process cartridge, and electrophotographic mechanism An electrophotographic photosensitive component includes a base layer having a structure represented by formula (1).

Description

"ELECTRO-PHOTO SENSITIVE COMPONENT, PROCESS CARTRIDGE, AND ELECTRO-PHOTO MECHANISM" BACKGROUND OF THE INVENTION

Field of the Invention The present invention relates to an electrophotographic photosensitive component, a process cartridge including an electrophotographic photosensitive component, and an electrophotographic mechanism.

Description of the Related Art Currently the fashionable electrophotographic photosensitive components used in process cartridges and electrophotographic mechanisms are those containing organic photoconductive substances. An electrophotographic photosensitive component typically includes a support and a photosensitive layer formed on the support.

A base layer is often interposed between the support and the photosensitive layer to suppress the charge injection from the support side toward the side of the photosensitive layer and to suppress the occurrence of image defects such as dark spots.

In recent years, electrophotographic photosensitive components have contained charge-generating substances having high sensitivity. However, when the sensitivity of charge generation substances increases, the amount of charges generated is increased and the charges tend to remain in the photosensitive layers, resulting in a problem called dual imaging. In particular, a phenomenon called positive double imaging where only the density of the light-irradiated portion during the previous rotation is increased in an output image is likely to occur.

Such a phenomenon of dual imaging has been suppressed, for example, by the addition of an electron transport substance to the base layer. From the point of view of the flexibility of the photosensitive layer material model over the base layer, a base layer containing an electron transport substance desirably utilizes a curable material that is sparingly soluble in the solvents contained in the coating solutions. for the formation of photosensitive layers. PCT Japanese Translation Patent Publication No. 2009-505156 discloses a base layer containing a polymer obtained from a cross-linking agent and a condensing polymer (electron transporting substance) having a tetracarbonylbisimide backbone and a moiety. of crosslinking. Japanese Open Patent No. 2006-178504 discloses a base layer containing a polymer of an electron transporting substance that has a non-hydrolyzable condensable polymerizable functional group.

In recent years, the quality requirements for electrophotographic images have become more and more stringent and the allowable range for positive double imaging has also been narrowed.

The inventors of the present invention have conducted extensive studies and have observed that the techniques disclosed in PCT Japanese Translation Patent Publication No. 2009-505156 and Japanese Open Patent Publication No. 2006-178504 have room for improvement such as suppression of image formation. Positive double. In addition, when charges tend to remain at the base layer and at the interface between the base layer and the photosensitive layer, the potential easily fluctuates after repeated use. Thus, the potential fluctuation needs to be reduced.

SUMMARY OF THE INVENTION The present invention provides an electrophotographic photosensitive component that suppresses positive double image formation and potential fluctuation despite long term repeated use. A process cartridge and an electrophotographic mechanism including the electrophotographic photosensitive component are also provided.

One aspect of the present invention provides an electrophotographic photosensitive component comprising a support, a base layer formed on the support, and a photosensitive layer formed on the base layer. The base layer comprises a structure represented by the formula (1) below: wherein, in formula (1), R 1 and R 3 each independently represent a substituted or unsubstituted alkylene group having from 1 to 10 main chain atoms or a group. substituted or unsubstituted phenylene; R2 represents a single bond, a substituted or unsubstituted alkylene group having from 1 to 10 main chain atoms, or a substituted or unsubstituted phenylene group; a substituted alkylene group substituent is an alkyl group, an aryl group, a hydroxy group, or a halogen atom; a substituted phenylene group substituent is a halogen atom, a nitro group, a cyano group, a hydroxy group, an alkyl group, or a halogenated alkyl group; R 9 represents a hydrogen atom or an alkyl group; A1 represents a group represented by any of the formulas (A-1) to (A-6) below; B1 represents a group represented by any of formulas (B-1) to (B-3) below; D1 represents a group having from 5 to 15 main chain atoms and being represented by formula (D) below; and E1 represents a divalent group represented by any of the formulas (E-1) to (E-8) below: (A-5) (A-6) where, in formula (A-5), R10 represents an atom hydrogen or an alkyl group; wherein, in the formulas of (B-1) to (B-3), R2 represents a single bond, a substituted or unsubstituted alkylene group having from 1 to 10 main chain atoms or a substituted or unsubstituted phenylene group; R® and R7 each independently represent an alkylene group having from 1 to 5 backbone atoms, an alkylene group having from 1 to 5 backbone atoms and being substituted with an alkyl group having from 1 to 5 backbone atoms. carbon, an alkylene group having from 1 to 5 main chain atoms and being substituted with a benzyl group, an alkylene group having from 1 to 5 main chain atoms and being substituted with an alkoxycarbonyl group, or a group of alkylene having from 1 to 5 main chain atoms and being substituted with a phenyl group; one of the carbon atoms in the main chain of the alkylene group may be substituted with O, S, NH or NR15, R15 representing an alkyl group; Ar 2 represents a substituted or unsubstituted phenylene group; a substituted phenylene group substituent is a halogen atom, a nitro group, a hydroxy group, a cyano group, an alkyl group, or a halogenated alkyl group; R12 represents a hydrogen atom or an alkyl group; A1 and A2 each represent a group represented by any of formulas (A-1) to (A-6) above; o, p and q each independently represents 0 or 1 and the sum of o, p and q is from 1 to 3, and * represents a side where R 3 of formula (1) is attached; (D) wherein in formula (D) R 4, R 6, R 6 and R 7 each independently represent an alkylene group having from 1 to 5 main chain atoms, an alkylene group having from 1 to 5 main chain atoms and being substituted with an alkyl group having from 1 to 5 carbon atoms, an alkylene group having from 1 to 5 main chain atoms and being substituted with a benzyl group, an alkylene group having from 1 to 5 chain atoms and being substituted with an alkoxycarbonyl group, or an alkylene group having from 1 to 5 main chain atoms and being substituted with a phenyl group; one of the carbon atoms in the main chain of the alkylene group may be substituted with O, S, NH or NR15, R15 representing an alkyl group; Ar1 and Ar2 each independently represent a substituted or unsubstituted phenylene group, a substituted phenylene group substituent is a halogen atom, a nitro group, a hydroxy group, a cyano group, an alkyl group, or a halogenated alkyl group; A2 represents a group represented by any of the formulas (A-1) to (A-6) above; and I, m, o and p each independently represent 0 or 1 and the sum of I, m and m is from 1 to 3, and the sum of o, p and q is from 1 to 3, and where, in the formulas of (E- 1) to (E-8), two selected from X11 to X16, two selected from X21 to X29, two selected from X31 to X36, two selected from X41 to X48, two selected from X51 to X58, two selected from X61 to X66 , two selected from X71 to X78, and two selected from X81 to X88, each represents a single bond, the remainder from X11 to X16, from X21 to X29, from X31 to X36, from X41 to X48, from X51 to X58, from X61 to X66, from X71 to X78, from X81 to X88 each independently represents a hydrogen atom, a halogen atom, an alkoxycarbonyl group, a carboxyl group, a cyano group, a dialkylamino group, a group hydroxy, a heterocyclic group, a nitro group, a substituted or unsubstituted alkoxy group, or a substituted or unsubstituted alkyl group, and Z51, Z52, Z62, Z62 and Z81 each independently. is preferably an oxygen atom, a group of C (CN) 2, or N-R 11, with R 11 representing a substituted or unsubstituted aryl group or a substituted or unsubstituted alkyl group.

Another aspect of the present invention provides a detachable process cartridge attached to a main body of an electrophotographic mechanism. The process cartridge integrally supports the photosensitive electrophotographic component described above and at least one device selected from the group consisting of a charging device, a developing device, a transfer device, and a cleaning device.

Yet another aspect of the present invention provides an electrophotographic mechanism comprising the electrophotographic photosensitive component described above, a charging device, an exposure device, a developing device and a transfer device.

Other aspects of the present invention will become apparent from the following description of exemplary embodiments with reference to the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic diagram of an electrophotographic mechanism including a process cartridge which includes an electrophotographic photosensitive component. Fig. 2 is a diagram illustrating a printing pattern used for dual image evaluation. Fig. 3 is a diagram illustrating a standard chessboard image.

Figs. 4A and 4B illustrate the layer configuration examples of an electrophotographic photosensitive component.

DESCRIPTION OF EMBODIMENTS

An electrophotographic photosensitive component according to an embodiment of the present invention includes a support, a base layer on the support, and a photosensitive layer on the base layer. The photosensitive layer may be a layered photosensitive layer (separate function) consisting of a charge generation layer containing a charge generation substance and a charge transport layer containing a charge transport substance. From the point of view of electrophotographic properties, the layered photosensitive layer can be a normal order layered photosensitive layer that includes a charge generation layer and a charge transport layer stacked in this order from the support side.

Figs. 4A and 4B are diagrams showing examples of the electrophotographic photosensitive component layer configuration. An electrophotographic photosensitive component in Fig. 4A includes a support 101, a base layer 102, and a photosensitive layer 103. An electrophotographic photosensitive component shown in Fig. 4B includes a support 101, a base layer 102, a photoelectric generation layer. 104, and a cargo transport layer 105. The base layer (cured layer) is a layer having a structure represented by formula (1) below. In other words, the base layer comprises a cured product (polymer) having a structure represented by formula (1) below. The base layer may consist of one or more layers. When the base layer is comprised of two or more layers, at least one of the layers has the structure represented by the formula (1) below: where R1 and R3 each independently represent a substituted or unsubstituted alkylene group having from 1 to 10. carbon atoms or a substituted or unsubstituted phenylene group; R 2 represents a single bond, a substituted or unsubstituted alkylene group having from 1 to 10 carbon atoms, or a substituted or unsubstituted phenylene group; R 9 represents a hydrogen atom or an alkyl group; A1 represents a group represented by one of the formulas (A-1) to (A-6) below; B1 represents a group represented by one of the formulas (B-1) to (B-3) below; D1 represents a group having from 5 to 15 backbone atoms and being represented by formula (D); and E1 represents a divalent group represented by one of the formulas (E-1) to (E-8) below. The substituent of the substituted alkylene group is an alkyl group, an aryl group, a hydroxy group, or a halogen atom. Examples of the substituted phenylene group substituent include a halogen atom, a nitro group, a cyano group, a hydroxy group, an alkyl group, and a halogen substituted alkyl group.

In formula (A-5), R 10 represents a hydrogen atom or an alkyl group.

In the formulas (B-1) to (B-3), R 2 represents a single bond, a substituted or unsubstituted alkylene group having from 1 to 10 backbone atoms or a substituted or unsubstituted phenylene group. R 6 and R 7 each independently represent an alkylene group having from 1 to 5 main chain atoms, an alkylene group having from 1 to 5 main chain atoms and being substituted with an alkyl group having from 1 to 5 carbon atoms , an alkylene group having from 1 to 5 main chain atoms and being substituted with a benzyl group, an alkylene group having from 1 to 5 main chain atoms and being substituted with an alkoxycarbonyl group, or an alkylene group having from 1 to 5 main chain atoms and being substituted with a phenyl group. One of the carbon atoms in the main chain of the alkylene group may be substituted with O, S, NH or NR15, where R15 represents an alkyl group. Ar 2 represents a substituted or unsubstituted phenylene group. R12 represents a hydrogen atom or an alkyl group. A1 and A1 each represent a group represented by any of formulas (A-1) to (A-6). In the formulas (B-1) to (B-3), o, p and q each independently represent an integer of 0 or 1 and their sum is 1 or more and 3 or less. The substituent of the substituted alkyl group is an alkyl group, an aryl group, or a halogen atom. The substituted phenylene group substituent is a halogen atom, a nitro group, a cinno group, a hydroxy group, an alkyl group, a halogenated alkyl group, or the like. The asterisk indicates the side that binds to R3 in formula (1). (D) In formula (D), R 4, R 5, R 6 and R 7 each independently represent an alkylene group having from 1 to 5 main chain atoms, an alkylene group having from 1 to 5 main chain atoms and being substituted with an alkyl group having from 1 to 5 carbon atoms, an alkylene group having from 1 to 5 main chain atoms and being substituted with a benzyl group, an alkylene group having from 1 to 5 main chain atoms and being substituted with an alkoxycarbonyl group, or an alkylene group having from 1 to 5 main chain atoms and being substituted with a phenyl group. One of the carbon atoms in the main chain of the alkylene group may be substituted with O, S, NH or NR15, where R15 represents an alkyl group. Ar1 and Ar2 each represent a substituted or unsubstituted phenylene group. Examples of the substituted phenylene group substituent include an alkyl group, an aryl group, and a halogen atom. Examples of the substituted phenylene group substituent include a halogen atom, a nitro group, a hydroxy group, a cyano group, an alkyl group, and a halogenated group. A2 represents a group represented by one of formulas (A-1) to (A-6); I, m and n, o, p and q each independently represent 0 or 1 and the sum of I, m and n and the sum of o, p and q are each 1 or more and 3 or less. R 4, R 5, R 6 and R 7 each independently represent an alkylene group having from 1 to 5 atoms in the main chain and being substituted with a methyl group or an ethyl group, or an alkylene group having from 1 to 5 atoms in the chain. main chain. More preferably, Ar1 and Ar2 each represent a phenylene group. From the standpoint of suppressing positive double imaging, D1 is more preferably a group having from 10 to 15 main chain atoms represented by formula (D).

In formulas (E-1) to (E-8), two selected from X11 to X1®, two selected from X21 to X29, two selected from X31 to X36, two selected from X41 to X48, two selected from X51 to X58 , two selected from X61 to X66, two selected from X71 to X78, and two selected from X81 to X88 are each a simple link. The remainder of X11 to X16, X21 to X29, X31 to X36, X41 to X48, X51 to X58, X®1 to X66, X71 to X78, X81 to X88 each independently represent a carbon atom. hydrogen, a halogen atom, an alkoxycarbonyl group, a carboxyl group, a cyano group, a dialkylamino group, a hydroxy group, a heterocyclic group, a nitro group, a substituted or unsubstituted alkoxy group, or a substituted or unsubstituted alkyl group. The substituted alkoxy group substituent is a carboxyl group, a cyano group, a dialkylamino group, a hydroxy group, an alkyl group, an alkoxy substituted alkyl group, a halogenated alkyl group, a halogenated alkyl group alkoxy, an alkoxy substituted alkoxy group, a halogen substituted alkoxy group, a nitro group, or a halogen atom. The substituent of the substituted alkyl group is a carboxyl group, a cyano group, a dialkylamino group, a hydroxy group, an alkyl group, an alkoxy substituted alkyl group, a halongenated alkyl group, a alkoxy, an alkoxy substituted alkoxy group, a halogen substituted alkoxy group, a nitro group, or a halogen atom. Z51 to Z52, Z61 to Z62 and Z81 each independently represent an oxygen atom, a group of C (CN) 2, or N-R11, with R11 representing a substituted or unsubstituted aryl group or a substituted or alkyl group. not replaced. The substituted aryl group substituent is a carboxyl group, a cyano group, a dialkylamino group, a hydroxy group, an alkyl group, an alkoxy substituted alkyl group, a halogenated alkyl group, a alkoxy, an alkoxy substituted alkoxy group, a halogen substituted alkoxy group, a nitro group, or a halogen atom. The substituent of the substituted alkyl group is a carboxyl group, a cyano group, a dialkylamino group, a hydroxy group, an alkyl group, an alkoxy substituted alkyl group, a halongenated alkyl group, a alkoxy, an alkoxy substituted alkoxy group, a halogen substituted alkoxy group, a nitro group, or a halogen atom.

In the structure represented by formula (1), R2 binds to a structure X marked by a dashed line in formula (1-A) below. This structure X is presumably the part corresponding to a resin chain.

In D1, the number of atoms in the main chain means the number of atoms that are present in the shortest segment between the right-to-end and left-to-end bonds in formula (D) above. For example, a p-phenylene group has 4 main chain atoms. An m-phenylene group has 3 main chain atoms. A p-phenylene group has 2 atoms of the main chain.

The inventors consider the following to be the reason why a base layer having a structure represented by formula (1) has a positive double imaging effect despite long term repeated use. The polymer disclosed in Japanese PCT Patent Publication No. 2009-505156 has a large distance (intramolecular distance) between an electron transport compound and a crosslinking agent and thus tends to form an electron collector. When an electron collector is formed in the base layer, the electron transport property tends to be degraded and residual charges easily occur. As a result, residual loads easily accumulate through long term repeated use, thus causing positive double imaging.

The inventors believe that long-term positive double imaging is suppressed because the electron transport structure (E1) is linked to the isocyanurate structure (the part surrounded by a dotted line in formula (1-A) through a group having from 5 to 15 atoms in the main chain. The electron transport structure (E1) and the isocyanurate structure both have an electron transport property and when these two structures bond together, a conduction level, which It is considered to be the cause of electron transport property, it is formed.

Moreover, since a group having from 5 to 15 main chain atoms represented by formula (D) is present between the electron transport structure and isocyanurate structure, a more uniform conduction level is formed. As a result, loads are rarely captured and residual charge generation is suppressed at the base layer. In addition, positive double image formation motivated by long-term repeated use is suppressed. If the number of atoms of the main chain at D1 is less than 5 or more than 15, residual charges easily accumulate in the base layer by long term repeated use and positive double imaging occurs easily.

If the number of atoms in the main chain at D1 is less than 5, the isocyanurate structure or electron transport structure directly binds to the urethane (-NHCO-) bonding moiety. In such a case, the urethane bonding part becomes susceptible to hydrolysis and the urethane bond splitting easily occurs. Since the conduction level in the base layer changes locally, charge collectors are generated and residual loads easily accumulate in the base layer during long term repeated use. If the number of atoms in the main chain at D1 is greater than 15, the interaction between the electron transport structure and the isocyanurate structure is inhibited, the electron transport structures tend to be localized, and the isocyanurate structures tend to be localized. to be located. Thus, conduction levels are formed between the electron transport structures and between the isocyanurate structures, thus taking the conduction level in the uneven base layer. Since the conduction level is uneven, charge collectors are generated and residual loads easily accumulate in the base layer during long term repeated use.

As described above, it is believed that positive double imaging resulting from long term repeated use can be suppressed when the electron transport structure is linked to the isocyanurate structure through a group having from 5 to 15 backbone atoms. represented by formula (D). The base layer may contain 30 mass% or more and 70 mass% or less of the structure represented by (1) relative to the total mass of the base layer. The content of the structure represented by formula (1) in the base layer can be analyzed by a common analytical technique. An example of the analytical technique is as follows. The structure content represented by the base layer formula (1) is determined by a KBr tablet method using a Fourier Transformed Infrared (FT-IR) spectroscope. Samples containing various amounts of tris (2-hydroxyethyl) cyanurate relative to KBr powder are used to form the calibration lines based on the absorptions attributable to the isocyanurate structure and then the content of the structure represented by formula (1). at the base layer can be calculated based on the calibration lines. The structure represented by formula (1) can be confirmed by conducting the measurement on the base layer. Examples of the measurement method include solid state 13 C-NMR spectroscopy, mass spectrometry, gas pyrolysis chromatography (GS) mass spectrometry (MS), and infrared absorption spectrometry. For example, solid state 13C-NMR spectroscopy can be conducted using CMX-300 Infinity produced by Chemagnetics under the following conditions: observed nucleus: 13C, reference substance: polydimethylsiloxane, transient number: 8192, pulse sequence : cross bias (CP) / uncoupled dipole (MAS) and uncoupled dipolar (DD) / MAS, pulse width: 2.1 psec (DD / MAS) and 4.2 psec (CP / MAS), contact: 2.0 msec, sample rotation rate: 10 kHz. Mass spectrometry can be conducted by using a mass spectrometer (MALDI-TOF MS, ultraflex produced by Bruker Daltonics) at an accelerating voltage of 20 kV in a reflective mode using C6o fullerene as the molecular weight standard. To determine molecular weight, Molecular weight was confirmed based on the main observed maximum values. The base layer may contain, in addition to the structure represented by the above formula (1), various resins, a crosslinking agent, a leveling agent, metal oxide particles, etc. to improve film-forming property and electrophotographic properties. However, the contents of such additives are preferably less than 50 mass% and more preferably less than 20 mass% relative to the total mass of the base layer. The thickness of the base layer may be 0.1 pm or more and 5.0 pm or less.

Specific examples of the structure represented by formula (1) are provided below. These examples do not limit the scope of the present invention. The right side of E1 in formula (1) represents a hydrogen atom, a substituted or unsubstituted aryl group, an alkyl group, or a linking moiety. One of the carbon atoms in the backbone of the substituted or unsubstituted alkyl group may be substituted with O, S, NH or NR15 with R15 representing an alkyl group. Examples of the substituted aryl group substituent include an alkyl group, a halogen atom, a nitro group, and a cyano group. Examples of the substituted alkyl group substituent include an alkyl group, an aryl group, a halogen atom, a nitro group, and a cyano group. In the case of the linking moiety, the moiety is attached to D1 of the structure represented by formula (1), but excluding E1 via a substituted or unsubstituted arylene group or an alkylene group. Examples of the substituted arylene group substituent include an alkyl group, a halogen atom, and a nitro group. Moreover, I, m, n, o, p and q are each 0 or 1.

In tablets, B1 represents a group represented by any of the formulas (B-1) to (B-3) below: - (B-2) The right side of E1 in formula (B-2) represents a hydrogen atom a substituted or unsubstituted aryl group, an alkyl group, a heterocyclic group, or a linking moiety. Examples of the substituted aryl group substituent include an alkyl group, a halogen atom, and a nitro group. In the case of the bonding moiety, the moiety is attached to D1 of the structure represented by formula (1) above, but excluding E1 via a substituted or unsubstituted arylene group or an alkylene group. In formula (B-3), the lower side of R2 indicates that it is attached to a side chain of a resin in the base layer.

In Tables 1 through 14 below, a connecting part is indicated by a dotted line. When a single link is represented, “Sng” is indicated in the table cell. The left-right arrangement of formula (1) is the same as that of the structures shown in Tables 1 through 14. In the Example Compounds described in Tables 1 through 14, R 9 in formula (1) is a hydrogen atom at all. the cases.

Table 1 Example Structure Table 2 *: Example Structure Tab *: Example Structure Table 4 * i Example Structure Table 5 *: Example Structure Table 6 *: Example Structure Table 7 _______ *: Example Structure Table 8 * : Structure of the Example Table 9 Table 10 Table 11 Table 12 Table 13 Table 14 In order to form a base layer having the structure represented by formula (1), a coating solution for a base layer is prepared by dissolving in a solvent, of an isocyanate compound (crosslinking agent), a resin having a polymerizable functional group reactive with the isocyanate group in the isocyanate compound, and an electron transport substance having a polymerizable functional group reactive to the isocyanate group in the compound isocyanate, and is applied to form a film, and the film is thermally cured. Thermal cure can be conducted during film drying as homogeneous reaction can be achieved. The isocyanate compound has an isocyanurate structure. The isocyanate group of the isocyanate compound may be blocked with a blocking agent such as an oxime (blocked isocyanate compound). A blocked isocyanate compound begins the addition reaction when heated together with the resin and electron transport substance and the blocking agent separates to promote crosslinking reactions. As a result, a base layer composed of a cured product having a structure represented by formula (1) is obtained.

Examples of the blocking agent include active methylene based compounds such as ethyl acetate and acetylacetone, mercaptan based compounds such as butyl mercaptan and dodecyl mercaptan, acid amide based compounds such as acetanilide and acetamide, lactam-based compounds such as ε-caprolactam, δ-valerolactam, and γ-butyrolactam, acid imide-based compounds such as succinimide and maleimide, imidazole-based compounds such as imidazole and 2-methylimidazole, urea-based compound such as ethylene urea, thiourea and urea, oxime-based compounds such as formamide oxime, acetaldoxime, acetone oxime, methyl ethyl ketoxime, methyl isobutyl ketoxime, and cyclohexanone oxime, and amine-based compounds such as diphenylaniline, aniline, carbazole, ethylene imine, and polyethylene imine. These blocking agents may be used alone or in combination.

Among these blocking agents, oxime-based compounds such as methyl ethyl ketoxime, lactam-based compounds such as ε-caprolactam, and imidazole-based compounds such as 2-methylimidazole are preferred from the points of view. wide applicability, ease of production, utility and temperature of thermal cure.

Examples of the isocyanate compound are as follows: The number of isocyanate groups in the isocyanate compound may be such that the ratio (1 / H) of the number (moles = I) of the isocyanate groups to the sum (number of moles = H) of the numbers of the polymerizable functional groups in the resin and the polymerizable functional groups in the electron transport substance is 0.5 or more and 2.5 or less. When the molar ratio l / H is 0.5 or more and 2.5 or less, the reaction efficiency of isocyanate groups and polymerizable functional groups is high and the crosslinking density is increased.

The polymerizable functional groups of the resin are preferably any or combination of a hydroxy group, a carboxyl group, an amide group, and a thiol group. More preferably, the polymerizable groups are hydroxy groups or amide groups that efficiently react with isocyanate groups. In other words, the resin may be a polyol, polyvinyl phenol or polyamide resin having two or more hydroxy groups or amide groups. The weighted average molecular weight (Mw) of the resin used in an embodiment of the present invention may be in the range of 5,000 to 1,500,000. The cured product having a structure represented by formula (1) above may further include a structure represented by formula (2) below. In other words, the resin preferably has a structure represented by formula (2) below. When a structure represented by formula (2) is included, the adhesion between the base layer and an upper or adjacent lower layer is improved and the thickness of the base layer becomes more uniform. Thus, positive double imaging and potential fluctuation are suppressed despite repeated long-term use. In formula (2), R 8 represents a substituted or unsubstituted alkyl group having from 1 to 5 carbon atoms. The substituted alkyl substituent is an alkyl group, an aryl group, or an atom. of halogen.

In the polymer having a structure represented by formula (1), R4, R5, R6 and R7 in D1 may each independently represent an alkylene group having from 1 to 5 backbone atoms and being substituted with a methyl group or a group. of ethyl or an alkylene group having from 1 to 5 main chain atoms from the point of view of reducing the initial positive double imaging.

In the polymer having a structure represented by formula (1), Ar1 and Ar2 in D1 may each independently represent an unsubstituted phenylene group from the point of view of suppressing the initial positive double imaging.

Examples of the electron transport substance having the polymerizable functional groups are as follows: I (Ε-19-7) Among these electron transport substances, Example Compounds from (E-1-1) to (E- 1-34) are particularly preferable. An electron transport substance having two or more polymerizable functional groups is particularly preferable as it helps to increase polymerization density (crosslinking).

A derivative having structure (E-1) (electron carrier substance derivatives) may be synthesized by known synthetic methods such as those disclosed in United States Patent Nos. 4,442,193, 4,992,349 and 5,468,583 and Chemistry of Materials, Vol. 19, No.11, 2703-2705 (2007), for example. Synthesis may also be conducted by reacting a tetracarboxylic naphthalene dianhydride and a commercially available monoamine derivative from Tokyo Chemical Industry Co., Ltd., Sigma-Aldrich Japan K.K., and Johnson Matthey Japan Incorporated.

Functional groups (a hydroxyl group, a thiol group, an amino group, and a carboxyl group), polymerizable with a crosslinking agent, may be introduced by a method for directly introducing the polymerizable functional groups into a derivative having a structure (E-1) or by a method of introducing structures having the polymerizable functional groups or functional groups which may serve as precursors of polymerizable functional groups. Examples of the latter method include a method for introducing a functional group-containing aryl group by conducting a cross-coupling reaction on a halide of a naphthylimide derivative and a base in the presence of a palladium catalyst, a method for introduction of a functional group-containing alkyl group by conducting a cross-coupling reaction on the halide and a base in the presence of a FeCl3 catalyst, and a method for introducing a hydroxyalkyl group or a carboxyl group by allowing an epoxy or CO2 compound acting on a lithium halide. There is also a method wherein a tetracarboxylic naphthalene dianhydride derivative or a monoamine derivative having the polymerizable functional groups or functional groups that can serve as precursors of the polymerizable functional groups is used as a raw material for the synthesis of a naphthylimide.

Derivatives having a structure (E-2) or (E-8) are commercially available from Tokyo Chemical Industry Co., Ltd., Sigma-Aldrich Japan K.K., and Johnson Matthey Japan Incorated, for example. They may also be synthesized by a synthetic method disclosed in United States Patent No. 4,561,332 using a fluorenone and malononitrile derivative. They may also be synthesized by a synthetic method disclosed in Japanese Open Patents Nos. 5-279582 and 7-70038 by use of a fluorenone derivative and an aniline derivative.

Functional groups (a hydroxyl group, a thiol group, an amino group, and a carboxyl group) polymerizable with the cross-linking agent may be introduced by a method for directly incorporating the polymerizable functional groups into a derivative having a structure. (E-2) or (E-8) or by a method for introducing structures having polymerizable functional groups or functional groups which may serve as precursors of polymerizable functional groups. Examples of the latter method include a method for introducing a functional group-containing aryl group by conducting a cross-coupling reaction on a halide of a fluorenone derivative and a base in the presence of a palladium catalyst, a method for introducing of a functional group-containing alkyl group by conducting a cross-coupling reaction on the halide and a base in the presence of a FeCl3 catalyst, and a method for introducing a hydroxyalkyl group or a carboxyl group by allowing a epoxy or CO2 compound act on a lithium halide.

There is also a method in which a tetracarboxylic naphthalene dianhydride derivative or a monoamine derivative having the polymerizable functional groups or functional groups that can serve as precursors of the polymerizable functional groups is used as a raw material for the synthesis of a naphthylimide.

Derivatives having a structure (E-3) may be synthesized by synthetic methods described in Chemistry Letters, 37 (3), 360-361 (2008) and Japanese Open Patent No. 9-151157, for example. Derivatives are also commercially available from Tokyo Chemical Industry Co., Ltd., Sigma-Aldrich Japan K.K. and Johnson Matthey Japan Incorporated.

Functional groups (a hydroxyl group, a thiol group, an amino group, and a carboxyl group) polymerizable with the cross-linking agent may be introduced by a method of introducing structures having the polymerizable functional groups or functional groups which may serve as precursors of the polymerizable functional groups for a naphthoquinone derivative. Examples of this method include a method for introducing a functional group-containing aryl group by conducting a cross-coupling reaction of a naphthoquinone halide and a base in the presence of a palladium catalyst, a method for introducing a group. of a functional group-containing alkyl by conducting a halide cross-coupling reaction and a base in the presence of a FeCl3 catalyst, and a method for introducing a hydroxyalkyl group or a carboxyl group by allowing an epoxy compound or CO2 acts on a lithium halide.

Derivatives having a structure (E-4) can be synthesized by synthetic methods disclosed in Japanese Open Patent No. 1-206349 and PPCI / Japan Hard Copy ‘98 proceedings, p. 207 (1998), for example. Derivatives may also be synthesized by using, as raw materials, commercially available phenol derivatives from Tokyo Chemical Industry Co., Ltd., and Sigma-Aldrich Japan K.K., for example.

Functional groups (a hydroxyl group, a thiol group, an amino group, and a carboxyl group) polymerizable with the crosslinking agent may be introduced by a method of introducing structures having the polymerizable functional groups or functional groups. which may serve as precursors of the polymerizable functional groups. Examples of this method include a method for introducing a functional group-containing aryl group by conducting a cross-coupling reaction of a diphenquinone halide and a base in the presence of a palladium catalyst, a method for introducing a group. of alkyl containing functional group by conducting a halide cross coupling reaction and a | It is based on the presence of a FeCl3 catalyst and a method for introducing a hydroxyalkyl group or a carboxyl group by allowing an epoxy or CO2 compound to act in a lithium halide.

Derivatives having a structure (E-5) are commercially available from Tokyo Chemical Industry Co., Ltd., Sigma-Aldrich Japan K.K. and Johnson Matthey Japan Incorporated, for example. They may also be synthesized from phenanthrene derivatives or phenanthroline derivatives by the synthetic methods disclosed in Chem. Educator No. 6, 227-234 (2001), Journal of Synthetic Organic Chemistry, Japan, Vol. 15, 29-32 (1957) and Journal of Synthetic Organic Chemistry, Japan, vol. 15, 32-34 (1957). A dicyclomethylene group may be introduced by a reaction with malononitrile.

Functional groups (a hydroxyl group, a thiol group, an amino group, and a carboxyl group) polymerizable with the cross-linking agent may be introduced by a method of directly introducing the polymerizable functional groups to a derivative having a structure. (E-5) prepared in advance or by a method of introducing structures having the polymerizable functional groups or functional groups which may serve as precursors of the polymerizable functional groups. Examples of the latter method include a method for introducing a functional group-containing aryl group by conducting a cross-coupling reaction of a phenanthrenquinone halide and a base in the presence of a palladium catalyst, a method for introducing a alkyl group containing functional group by conducting a halide cross-coupling reaction and a base in the presence of a FeCl3 catalyst, and a method for introducing a hydroxyalkyl group or a carboxyl group by allowing an epoxy compound or CO2 acting on a lithium halide.

Derivatives having a structure (E-6) are commercially available from Tokyo Chemical Industry Co., Ltd., Sigma-Aldrich Japan K.K. and Johnson Matthey Japan Incorporated, for example. They may also be synthesized from phenanthrene derivatives or phenanthroline derivatives by a synthetic method disclosed in Bull. Chem. Soc. Jpn., Vo. 65, 1006-1011 (1992). A dicyclomethylene group may also be introduced by a reaction with malononitrile.

Functional groups (a hydroxyl group, a thiol group, an amino group, and a carboxyl group) polymerizable with the cross-linking agent may be introduced by a method of directly introducing the polymerizable functional groups to a derivative having a structure. (E-6) prepared in advance or by a method of introducing structures having the polymerizable functional groups or functional groups which may serve as precursors of the polymerizable functional groups. Examples of the latter method include a method for introducing a functional group-containing aryl group by conducting a phenanthroline quinone halide cross-coupling reaction and a base in the presence of a palladium catalyst, a method for introducing a functional group-containing alkyl group by conducting a halide cross-coupling reaction and a base in the presence of a FeCl3 catalyst, and a method for introducing a hydroxyalkyl group or a carboxyl group by allowing a compound of epoxy or CO2 act on a lithium halide.

Derivatives having a structure (E-7) are commercially available from Tokyo Chemical Industry Co., Ltd., Sigma-Aldrich Japan K.K. and Johnson Matthey Japan Incorporated, for example.

Polymerizable groups (a hydroxyl group, a thiol group, an amino group, and a carboxyl group), polymerizable with a crosslinking agent, may be introduced by a method of introducing structures having the polymerizable functional groups or functional groups which may serve as precursors of polymerizable functional groups to a commercially available anthraquinone derivative. Examples of this method include a method for introducing a functional group-containing aryl group by conducting an anthraquinone halide cross-coupling reaction and a base in the presence of a palladium catalyst, a method for introducing a group of a functional group-containing alkyl by conducting a halide cross-coupling reaction and a base in the presence of a FeCl3 catalyst, and a method for introducing a hydroxyalkyl group or a carboxyl group by allowing an epoxy compound or CO2 acts on a lithium halide.

Examples of the solvent used in the base layer coating solution include alcohol based solvents, aromatic hydrocarbon based solvents, halogenated hydrocarbon based solvents, ketone based solvents, ketone alcohol based solvents, solvent based solvents ether and ester based solvents. Specific examples of these are methanol, ethanol, n-propanol, isopropanol, n-butanol, benzyl alcohol, methyl cellosolve, ethyl cellosolve, acetone, methyl ethyl ketone, cyclohexanone, methyl acetate, n-butyl acetate, dioxane tetrahydrofuran, methylene chloride, chloroform, chlorobenzene, and toluene. These solvents may be used alone or in combination. Any mixture of two or more solvents may be used as long as the mixture can dissolve the isocyanate compound, resin and electron transport substance. The electrophotographic photosensitive component according to one embodiment of the present invention may be a cylindrical electrophotographic photosensitive component including a cylindrical support and a photosensitive layer (charge generation layer and charge transport layer) on the support. Alternatively, the electrophotographic photosensitive component may have a belt shape, a blade shape, or the like. The bracket may have electrical conductivity (conductive bracket). For example, the support may be composed of a metal such as aluminum, nickel, copper, gold or iron, or an alloy. Alternatively, a support formed by forming a thin film of aluminum metal, silver, gold or the like on an insulation support such as a polyester resin support compound, a polycarbonate resin, a polyimide resin, A glass, or support in which a thin film of a conductive material such as indium oxide or tin oxide is formed may also be used as the support. The support surface may be subjected to an electrochemical treatment such as anodic oxidation, a wet grinding treatment, an explosion treatment, or a cutting treatment to improve electrical properties and suppress interference margins.

A conductive layer may be incorporated between the support and the base layer. The conductive layer is obtained by forming a coating film on a support by using a coating solution containing a resin and conductive particles dispersed in the resin and drying the coating film. Examples of conductive particles include carbon black, acetylene black, metal powder such as aluminum powder, nickel, iron, nichrome, copper, zinc and silver, and metal oxide powder such as conductive tin oxide and indium oxide. tin (ITO).

Examples of the resin include polyester resins, polycarbonate resins, polyvinyl butyral resins, acrylic resins, silicon resins, epoxy resins, melamine resins, urethane resins, phenolic resins and alkyd resins.

Examples of the solvent used for the preparation of the coating solution for a conductive layer include ether based solvents, alcohol based solvents, ketone based solvents and aromatic hydrocarbon solvents. The thickness of the conductive layer is preferably 0.2 pm or more and 40 pm or less, more preferably 1 pm or more and 35 pm or less, and most preferably 5 pm or more and 30 pm or less. The base layer is interposed between the support and the photosensitive layer or between the conductive layer and the photosensitive layer.

Soon after, the photosensitive layer is formed on the base layer.

Examples of the charge generating substance include azo pigments, perylene pigments, anthraquinone derivatives, anti-armchair derivatives, dibenzopyrenoquinone derivatives, pirantrone derivatives, violantrone derivatives, isoviolantrone derivatives, indigo derivatives, thioindigo derivatives, phthalocyanine pigments such as metal phthalocyanine and metal-free phthalocyanine, and bisbenzimidazole derivatives. Among these, azo pigments and phthalocyanine pigments are preferable. Among the phthalocyanine pigments, oxytitanium phthalocyanine, chlorogal phthalocyanine and hydroxygalium phthalocyanine are preferable. The photosensitive layer may be a layered photosensitive layer. In such a case, examples of the binder resin used in the filler layer include polymers and copolymers of vinyl compounds such as styrene, vinyl acetate, vinyl chloride, acrylates, methacrylates, vinylidene and trifluoroethylene fluoride, alcohol resins. polyvinyl, polyvinyl acetal resins, polycarbonate resins, polyester resins, polysulfone resins, polyphenylene oxide resins, polyurethane resins, cellulosic resins, phenolic resins, melamine resins, silicon resins and epoxy resins. Among these, polyester resins, polycarbonate resins and polyvinyl acetal resins are preferable, and polyvinyl acetal resins are more preferable. The ratio of filler to binder resin in the filler layer (filler / binder) is preferably in the range of 10/1 to 1/10, and more preferably in the range of 5/1 to 1/5 The thickness of the charge generation layer may be 0.05 pm or more and 5 pm or less. Examples of the solvent used for the preparation of the coating solution for a filler layer include alcohol based solvents, sulfoxide based solvents, ketone based solvents, ether based solvents, ester based solvents and solvents. of aromatic hydrocarbon.

Examples of the gap carrier substance include polycyclic aromatic compounds, heterocyclic compounds, hydrazone compounds, styryl compounds, benzidine compounds, triarylamine compounds and triphenylamine compounds; and polymers having a backbone or side chain containing a group derived from any of these compounds.

In cases where the photosensitive layer is a layered photosensitive layer, the binder resin used in the cargo transport layer (gap transport layer) may be a polyester resin, a polycarbonate resin, a polymethacrylate resin, a polyarylate resin. a polysulfone resin or a polystyrene resin, for example. The binder resin is more preferably a polycarbonate resin or a polyarylate resin. The weighted average molecular weight (Mw) of the resin may be in the range of 10,000 to 300,000. The ratio of the gap carrier to the binder resin in the charge carrier layer (gap carrier / binder resin) is preferably in the range of 10/5 to 5/10, and more preferably in the range of 10/8. at 6/10. The gap transport layer thickness may be 5 pm or more and 40 pm or less.

Examples of the solvent used in the coating solution for a gap carrier layer include alcohol based solvents, sulfoxide based solvents, ketone based solvents, ether based solvents, ester based solvents and aromatic hydrocarbon solvents. .

A protective layer (surface protection layer) containing conductive particles or a filler carrier and a binder resin may be provided on the photosensitive layer (charge carrier layer). The protective layer may further contain additives such as a lubricant. Electrical conductivity or a gap-carrying property can be improved with the protective layer binder resin. In such a case, there is no need to add conductive particles or a gap-carrying substance other than resin in the protective layer. The binder resin of the protective layer may be a thermoplastic resin or a curable resin (cured) with heat, light, or radiation (such as an electron beam).

Layers, such as a base layer and a photosensitive layer (a charge generation layer and a charge transport layer), which constitute the electrophotographic photosensitive component may be formed by the dissolution or dispersion of materials constituting the respective layers in the layers. solvents to obtain coating solutions, application of coating solutions, and drying and curing of applied coating solutions. Examples of the method used for applying the coating solutions include a dip coating method, a spray coating method, a curtain coating method and a rotary motion coating method. Of these, a dip coating method is preferable from the standpoint of efficiency and productivity. Fig. 1 is a schematic diagram of an electrophotographic mechanism including a process cartridge including an electrophotographic photosensitive component in accordance with an embodiment of the present invention.

Referring to Fig. 1, an electrophotographic photosensitive component 1 has a cylindrical shape and is rotated about an axis 2 in the direction of the arrow at a particular peripheral velocity. The surface (peripheral surface) of the rotated electrophotographic photosensitive component 1 is uniformly charged at a particular positive or negative potential with a charging device 3 (a primary charging device such as a charging roller). The surface is then exposed to exposure light (image exposure light) 4 from an exposure device (not shown) through, for example, slotted exposure or laser beam scanning exposure. As a result, an electrostatic imaging corresponding to a desired image is formed on the surface of the electrophotographic photosensitive component 1. The electrostatic imaging formed on the surface of the electrophotographic photosensitive component 1 is developed with a toner contained in a developer in a developer 5 to form a toner image. The toner image on the surface of the electrophotographic photosensitive component 1 is transferred to a transfer material (such as paper) P due to a transfer bias of a transfer device (such as the transfer roller) 6. The transfer material P is taken from a transfer material feed unit (not shown in the drawing) and fed into the tightness (contact portion) between the electrophotographic photosensitive component 1 and the transfer device 6 in sync with the rotation of the electrophotographic photosensitive component 1. The transfer material P that has received the image transfer from the toner is separated from the surface of the electrophotographic photosensitive component 1 and directed to a fixture unit 8 where the image is fixed. An image product (an impression or a copy) is the production of the engine. The surface of the electrophotographic photosensitive component 1 after toner image transfer is cleaned with a cleaning device (such as a cleaning blade) 7 to remove the developer (toner) remaining after transfer. Then the charge is extinguished with a pre-exposure light (not shown in the drawing) from a pre-exposure device (not shown in the drawing) so that the electrophotographic photosensitive component 1 can be repeatedly used to form images. When the loading device 3 is of a contact loading type such as a loading roller as shown in FIG. 1, pre-exposure is not always required.

Two or more selected from the electrophotographic photosensitive component 1, the charging device 3, the developing device 5, the transfer device 6, the cleaning device 7, etc. may be housed in a container to form a cartridge of the The process cartridge and the process cartridge may be configured to be removably charged to the main unit of an electrophotographic mechanism such as a copying machine or a laser beam printer. In FIG. 1, the electrophotographic photosensitive component 1, the charging device 3, the developing device 5 and the cleaning device 7 are integrally supported to form a cartridge 9 which is detachable and detachable from the main unit of the electrophotographic mechanism via a guiding unit 10 as a bulkhead of the main body of the electrophotographic mechanism.

EXAMPLES The present invention will now be described in more detail by way of specific examples. Note that in the description of the Examples below, "parts" means "parts by mass". EXAMPLE 1 Two electrophotographic photosensitive components were prepared as below. One was used for structural analysis of the base layer and the other was used to evaluate positive double image formation.

An aluminum cylinder having a length of 260.5 mm and a diameter of 30 mm (JIS-A3003, aluminum alloy) was used as a support (conductive support).

Then 50 parts of titanium oxide particles (dust resistivity: 120 Ω-cm, coverage (mass ratio): 40%) coated with oxygen deficient tin oxide, 40 parts of a phenolic resin (PLYOPHEN J-325 , produced by DIC Corporation, resin solids content: 60%), and 40 parts methoxypropanol were placed in a sand mill containing 1 mm diameter glass globules and dispersed for 3 hours to prepare a coating solution ( dispersion) to a conductive layer. The coating solution for a conductive layer was applied to the support through the dip coating and the obtained coating film was dried and heat cured at 145 ° C for 30 min. As a result, a conductive layer having a thickness of 16 µm was formed. The average particle size of oxygen deficient tin oxide-coated titanium oxide particles in the coating solution for a conductive layer was measured with a particle size analyzer (trade name: CAPA700 produced by Horiba Ltd.) using of tetrahydrofuran as a dispersion medium by a centrifugal sedimentation technique at a rotation speed of 5000 rpm. The average particle size observed was 0.33 pm.

In a mixed solution containing 50 parts of methyl ethyl ketone and 50 parts of dimethylacetammide, 3.6 parts of Example Compound (E-1-1) which serves as an electron carrier, 6.2 parts of Example Compound (I-8) which serves as an isocyanate compound, and 1.29 part of a butyral resin (trade name: BM-1, produced by Sekisui Chemical Co., Ltd.) which serves as a resin, have been dissolved. To the resulting solution, 0.31 part dioctyltin dilaurate was added as a catalyst to prepare a coating solution for a base layer. The coating solution for a base layer was applied to the conductive layer by dipping and the resulting coating film was polymerized (cured) by heating at 160 ° C for 30 minutes. As a result, a base layer having a thickness of 0.5 µm was obtained.

In a sandmill containing 1 mm diameter glass globules 260 parts cyclohexanone, 5 parts of a butyral resin (trade name: BX-1 produced by Skisui Chemical Co., Ltd.), and 10 parts of crystals of hydroxyalkyl phthalocyanine (charge-generating substance) which had intense peaks at Bragg angles (2Θ ± 2 °) of 7.5 °, 9.9 °, 12.5 °, 16.3 °, 18.6 °, 25.1 °, and 28.30 in CuKa radiation X-ray diffraction were placed and a dispersion treatment was performed for 1.5 hours. To the resulting mixture, 240 parts of ethyl acetate were added to prepare a coating solution for a charge generation layer. The coating solution for the charge generation layer was applied to the base layer by dip coating and the resulting coating film was dried at 95 ° C for 10 minutes to form a charge generation layer having a thickness of 0 ° C. , 18 pm.

In a mixed solvent 30 parts of dimethoxymethane and 70 parts of chlorobenzene, 7 parts of an amine compound (gap carrier) represented by the formula (15) below and 10 parts of a polyarylate resin consisting of a structural unit of repetition represented by formula (16-1) below and a structural repeat unit represented by formula (16-2) below at a ratio of 5/5 and having a weighted average molecular weight (Mw) of 100,000 were dissolved to prepare a solution. coating for a cargo transport layer. The coating solution for the charge transport layer was applied to the charge generation layer by dip coating and the resulting coating film was dried at 120 ° C for 40 minutes. As a result, a cargo transport layer having a thickness of 18 pm was obtained.

As a result, an electrophotographic photosensitive component that included a conductive layer, a base layer, a charge generation layer, and a charge transport layer that were stacked in this order on a support was obtained. The structure of the base layer was analyzed by the following process. The electrophotographic photosensitive component for the base layer structural analysis was immersed in a mixed solvent containing 40 parts dimethoxymethane and 60 parts chlorobenzene for 5 minutes and ultrasonic waves were applied to the electrophotographic photosensitive component to separate the gap transport layer. . The charge generation layer was polished with a wrapping tape (C2000 produced by Fujifilm Holdings Corporation) and then dried at 100 ° C for 10 minutes to prepare an electrophotographic photosensitive component for the analysis of the base layer structure. A Fourier transformed infrared attenuated total reflectance (ATR) spectrometry (FTIR) was conducted to confirm the absence of the charge transport layer and charge generation layer components on the base layer surface. The photosensitive limb was allowed to stand in a 25 ° C / 50% RH environment for 24 hours and a 1 cm square piece was cut from the central part (position 130 mm from the end) of the electrophotographic photosensitive component to prepare a sample for analysis. of the base layer structure. The structure represented by formula (1) and the number of atoms of the B-chain backbone were confirmed by solid state 13C-NMR spectroscopy, mass spectrometry, gas pyrolysis chromatography mass spectrometry, and infrared absorption. The structure represented by formula (1) and the number of atoms of the main chain in structure D1 are shown in Tables 15 to 17. The other electrophotographic photosensitive component was used to conduct the following assessment. The electrophotographic photosensitive component obtained was loaded onto a modified laser beam printer (trade name: LBP-2510 produced by Canon Kabushíki Kaisha) in an environment of 23 ° C 50% RH. Surface potential was measured, the fluctuation (potential fluctuation) of the light potential observed during repeated use of the production of 5000 printed copies was evaluated, and the double image formation observed during repeated use of the production of 5000 printed copies was evaluated. . Details are described below. The electrophotographic photosensitive component obtained was installed in a cyan process cartridge of a laser beam printer modified so as not to lead to pre-exposure. The process cartridge was loaded into a printer cyan process cartridge station and images were produced. First, one sheet with a solid white image, five sheets with images for dual imaging, one sheet with solid black, and five sheets with dual imaging were continuously produced in this image. order. Then a test chart (characters with a 5% print ratio) was produced on 5000 sheets of A4 sized regular paper and then one sheet with a solid white image, five sheets with images for the evaluation of double image formation, a sheet with a solid black image, and five image sheets for the dual imaging evaluation were continuously produced in this order. Fig. 2 shows the image for the evaluation of dual imaging. As shown in Fig. 2, the hard copy includes a white image part at a top where square solid images were printed and a Keima pattern part at a bottom where a halftone image of a Keima pattern as shown in Fig. 3 was printed. In Fig. 2, the parts where double imaging derived from solid images may occur are marked as "double imaging". Evaluation of positive double imaging was performed by measuring the difference (Macbeth density difference) between the image density of the spaced chessboard pattern and the image density in the dual imaging parts. Density difference was measured at ten points on an image sheet for dual imaging evaluation using a spectrum densitometer (trade name: X-Rite 504/508, produced by X-Rite Inc.). This operation was conducted on all ten sheets of the images for dual imaging evaluation and the results of this 100-point total were split proportionally to evaluate the Macbeth density difference at the early stage and after repeated use of 5000 copy production. printed. An image in which the density of the dual imaging portion was higher was considered to be a positive dual imaging image. The smaller the difference in density, the more suppressed positive double imaging. The smaller the difference in Macbeth density between the early stage and after production of 5000 sheets, the greater the effect of suppressing the fluctuation of positive double imaging. The results are shown in Table 15 to 17. Potential fluctuation (light potential fluctuation) was evaluated by the following process. The exposure dose (image exposure dose) of a 780 nm laser beam source from an evaluation device was determined so that the amount of light on the surface of the electrophotographic photosensitive component was 0.3 μϋ / cm2. The surface potential (dark potential and light potential) on the surface of the electrophotographic photosensitive component was measured by replacing an evaluation device developing unit with a template having a potential measuring probe fixed to be positioned at a position of 130 °. mm from one end of the electrophotographic photosensitive component, and conduct the measurement through the probe at the position where the developer unit was placed. The applied bias was fixed so that the dark potential of the unexposed portion of the electrophotographic photosensitive component was -450 V, and the laser beam was applied to measure the light potential resulting from the light decay of the dark potential. Images were continuously produced on 5000 sheets of A4 sized regular paper and the light potential thereafter (the light potential after repeated use) was measured. The difference between early-stage light potential and light potential after repeated use (fluctuation of light potential) was then calculated. The test chart used had an impression ratio of 5%. Results are shown in the potential fluctuation columns in Tables 15-17. EXAMPLES 2-10 Electrophotographic photosensitive components were prepared as in Example 1 except that the electron transport substance, the isocyanate compound (crosslinking agent), and the resin used in Exemplol were altered as shown in Table 15. Evaluation was conducted as in Example 1. Results are shown in Table 15. EXAMPLE 11 An electrophotographic photosensitive component was prepared as in Example 1 except that the carrier substance was electrons and the isocyanate compound (crosslinking agent) were changed as shown in Table 15, and the resin was changed to 1.29 part of a butyral resin (trade name: BX-1 produced by Sekisui Chemical Co., Ltd. ). The evaluation was conducted as in Example 1. Results are shown in Table 15. EXAMPLE 12 An electrophotographic photosensitive component was prepared as in Example 1 except that the electron transport substance and isocyanate compound were altered as shown in Table 15, and the resin was changed to 1.29 part of a polyvinyl alcohol resin (trade name: PVA117 produced by Kuraray Co., Ltd.). Evaluation was conducted as in Example 1. Results are shown in Table 15. EXAMPLE 13 An electrophotographic photosensitive component was prepared as in Example 1 except that the electron transport substance and isocyanate compound were altered as shown in Table 15, and the resin was changed to 1.29 part of a partially hydrolyzed vinyl chloride / vinyl acetate resin (trade name: VAGH produced by Dow Chemical Company). Evaluation was conducted as in Example 1. Results are shown in Table 15. EXAMPLE 14 An electrophotographic photosensitive component was prepared as in Example 1 except that the electron transport substance and isocyanate compound were altered as shown in Table 15 and 1.29 part of a poly (p-hydroxystyrene) (trade name: MARUKA LYNCUR produced by Maruzen Petrochemical Co., Ltd.) was used as the resin. The evaluation was conducted as in Example 1. Results are shown in Table 15. EXAMPLES 15-90 Electrophotographic photosensitive components were prepared as in Example 1 except that the electron transport substance, isocyanate compound, and resin were prepared. Table 15 to 17. Evaluation was conducted as in Example 1. Results are shown in Tables 15 to 17. EXAMPLE 91 A photosensitive electrophotographic component was prepared as in Example 1 except that the coating solution for a conductive layer, the coating solution to a base layer, and coating solution to a cargo transport layer were changed as follows. The evaluation of positive double image formation was conducted as in Example 1. The results are shown in Table 17. Preparation of the coating solution for a conductive layer was changed as follows. In a sand mill containing 450 parts of 0.8 mm diameter glass globules, 214 parts of oxygen-deficient titanium oxide (Ti02) coated particles that serve as metal oxide particles , 132 parts of a phenolic resin (trade name: PLYOPHEN J-325 produced by DIC Corporation, resin solids content: 60%) serving as a solvent were placed and a dispersion treatment was conducted at a rotation rate of 2000. rpm, a dispersion treatment time of 4.5 hours, and a fixed cooling water temperature of 18 ° C to obtain a dispersion. Glass globules were removed from the dispersion using a mesh (aperture: 150 pm).

Silicon resin particles (trade name: Tospearl 120 produced by Momentive Performance Materials Inc., mean particle diameter: 2 pm) serving as a surface roughness supplier were added to the dispersion after removal of the glass globules so that the The amount of silicon resin particles was 10% by weight relative to the total mass of the binder resin and the metal oxide particles in the dispersion. A silicon oil (trade name: SH28PA produced by Dow Corning Toray Co., Ltd.) which serves as a leveling agent was added to the dispersion so that the amount of silicon oil was 0.01 wt. the total mass of the metal oxide particles and the binder resin in the dispersion. The resulting mixture was stirred to prepare a coating solution for a conductive layer. The coating solution for a conductive layer was applied to a support through the dip coating and the resulting coating film was dried and thermally cured at 150 ° C for 30 minutes. As a result, a conductive layer having a thickness of 30 µm was obtained.

Then a coating solution for a base layer was prepared as in Example 1 except that the electron transport substance and isocyanate compound were changed as shown in Table 17, an acetal resin (trade name: KS-5 produced by Sekisui Chemical Co., Ltd.) was added as the resin, and 0.31 part zinc (II) octylate was added as a catalyst. The coating solution for a base layer was applied to the conductive layer to form a coating film, and the coating film was polymerized (cured) by heating at 160 ° C for 30 minutes. As a result, a base layer having a thickness of 0.5 µm was obtained.

A charge generation layer was prepared as in Example 1. The preparation of a coating solution for a charge transport layer was changed as follows. In a mixed solvent containing 30 parts dimethoxymethane and 50 parts ortho-xylene, 9 parts of a cargo carrier having a structure represented by the above formula (15), 1 part of a cargo carrier having a structure represented by formula (18) below, 3 parts of a polyester resin F (weighted average molecular weight: 90,000) consisting of a repeating structural unit represented by (24) below, a repeating structural unit represented by formula (26) below, and a repeating structural unit represented by formula (25) below, with a ratio of (26) / (25) being 7/3, and 7 parts of a polyester resin H (weighted average molecular weight: 120,000) consisting of a repeating structural unit represented by formula (27) below and a repeating structural unit represented by formula (28) below in a ratio of 5/5 have been dissolved to prepare a solution. coating for a cargo transport layer. In polyester resin F, the content of the repeating structural unit represented by the formula (24) was 10% by weight and the content of the repeating structural units represented by the formulas (25) and (26) below was 90% by weight . The coating solution for a cargo transport layer was applied to the charge generation layer by dip coating and dried at 120 ° C for 1 hour to form a cargo transport layer having a thickness of 16 µm. The obtained cargo transport layer was confirmed to contain a domain structure containing polyester resin F in the matrix containing polyester resin H and the cargo carrier substance. EXAMPLES 92-111 Electrophotographic photosensitive components were prepared as in Example 91 except that the electron transport substance, the isocyanate compound, and the resin were altered as shown in Table 17. The evaluation was conducted as in Example 91. The results are shown in Table 16. EXAMPLE 112 An electrophotographic photosensitive component was prepared as in Example 93 except that the preparation of the coating solution for a charge transport layer was changed as follows. Evaluation was conducted as in Example 93. Results are shown in Table 17. Preparation of the coating solution for a cargo transport layer was changed as follows. In a mixed solvent containing 30 parts dimethoxymethane and 50 parts ortho-xylene, 9 parts of a cargo carrier having a structure represented by the above formula (15), 1 part of a cargo carrier having a structure represented by formula (18) above, 10 parts of a polycarbonate resin I (weighted average molecular weight: 70,000) consisting of a repeating structural unit represented by (29) below, and 0.3 part of a polycarbonate resin J (weight 40,000) having a repeating structure represented by formula (29) below and a repeating structure represented by formula (30) below and having a structure represented by formula 31 below at at least one of the terminations were dissolved to prepare a coating solution for a cargo transport layer. The total mass of the structures represented by formulas (30) and (31) in polycarbonate resin J was 30% by weight. The coating solution for a charge transport layer was applied to the charge generation layer by dip coating and dried at 120 ° C for 1 hour to obtain a charge transport layer having a thickness of 16 μιη. EXAMPLE 113 An electrophotographic photosensitive component was prepared as in Example 112 except that in preparing a coating solution for a charge transport layer, 10 parts of a polyester resin H (weighted average molecular weight: \ 120,000) were used in 10 parts of polycarbonate resin I (weighted average molecular weight: 70,000). The evaluation was conducted as in Example 112. The results are shown in Table 17. EXAMPLE 114 An electrophotographic photosensitive component was prepared as in Example 93 except that the preparation of the coating solution for a conductive layer was changed as follows. Evaluation was conducted as in Example 93. Results are shown in Table 17. Preparation of the coating solution for a conductive layer was changed as follows. In a sandmill containing 450 parts of 0.8 mm diameter glass globules, 207 parts of phosphorus-impregnated titanium oxide (Ti) coated particles (P02) (Sn02) which serve as metal oxide, 144 parts of a phenolic resin (trade name: PLYOPHEN J-325) which serves as a binder resin, and 98 parts of 1-methoxy-2-propanol as a solvent were placed and a dispersion treatment was carried out. conducted at a rotation rate of 2000 rpm, a dispersion treatment time of 4.5 hours, and a fixed cooling water temperature of 18 ° C to obtain a dispersion. Glass globules were removed from the dispersion using a mesh (aperture: 150 pm).

Silicon resin particles (trade name: Tospearl 120) serving as a surface roughness supplier were added to the dispersion after removal of the glass globules so that the amount of silicon resin particles was 15% by weight the total mass of the binder resin and the metal oxide particles in the dispersion. A silicon oil (trade name: SH28PA) which serves as a leveling agent was added to the dispersion so that the amount of silicon oil was 0.01% by weight relative to the total mass of the metal oxide particles. of the binder resin in the dispersion. The resulting mixture was stirred to prepare a coating solution for a conductive layer. The coating solution for a conductive layer was applied to a support through the dip coating and the resulting coating film was dried and thermally cured at 150 ° C for 30 minutes. As a result, a conductive layer having a thickness of 30 µm was obtained. EXAMPLE 115 An electrophotographic photosensitive component was prepared as in Example 112 except that the preparation of the coating solution for a conductive layer was changed as follows. Evaluation was conducted as in Example 112. Results are shown in Table 17. Preparation of the coating solution for a conductive layer was changed as follows. In a sandmill containing 450 parts of 0.8 mm diameter glass globules, 207 parts of phosphorus-impregnated titanium oxide (Ti) coated particles (P02) (Sn02) which serve as metal oxide, 144 parts of a phenolic resin (trade name: PLYOPHEN J-325 produced by DIC Corporation, resin solids content: 60%) which serves as the binder resin, and 98 parts of 1-methoxy-2-propanol which served as a solvent were placed and a dispersion treatment was conducted at a rotation rate of 2000 rpm, a dispersion treatment time of 4.5 hours, and a fixed cooling water temperature of 18 ° C to get a scatter.

Glass globules were removed from the dispersion using a mesh (aperture: 150 pm).

Silicon resin particles (trade name: Tospearl 120 produced by Momentive Performance Materials Inc., average particle diameter: 2 pm) that serve as a surface roughness supplier were added to the dispersion after removal of the glass globules so that the The amount of silicon resin particles was 15% by weight relative to the total mass of the binder resin and the metal oxide particles in the dispersion. A silicon oil (trade name: SH28PA produced by Dow Corning Toray Co., Ltd.) which serves as a leveling agent was added to the dispersion so that the amount of silicon oil was 0.01 wt. the total mass of the metal oxide particles and the binder resin in the dispersion. The resulting mixture was stirred to prepare a coating solution for a conductive layer. The coating solution for a conductive layer was applied to a support through the dip coating and the resulting coating film was dried and thermally cured at 150 ° C for 30 minutes. As a result, a conductive layer having a thickness of 30 µm was obtained. EXAMPLE 116 An electrophotographic photosensitive component was prepared as in Example 113 except that the preparation of the coating solution for a conductive layer was changed as follows. Evaluation was conducted as in Example 113. Results are shown in Table 17. Preparation of the coating solution for a conductive layer was changed as follows. In a sandmill containing 450 parts of 0.8 mm diameter glass globules, 207 parts of phosphorus-impregnated titanium oxide (Ti) coated particles (P02) (Sn02) which serve as metal oxide, 144 parts of a phenolic resin (trade name: PLYOPHEN J-325) which serves as a binder resin, and 98 parts of 1-methoxy-2-propanol as a solvent were placed and a dispersion treatment was carried out. conducted at a rotation rate of 2000 rpm, a dispersion treatment time of 4.5 hours, and a fixed cooling water temperature of 18 ° C to obtain a dispersion. Glass globules were removed from the dispersion using a mesh (aperture: 150 pm).

Silicon resin particles (trade name: Tospearl 120) serving as a surface roughness supplier were added to the dispersion after removal of the glass globules so that the amount of silicon resin particles was 15% by weight the total mass of phenolic resin and metal oxide particles in the dispersion. A silicone oil (trade name: SH28PA) that serves as an agent of! The leveling was added to the dispersion so that the amount of silicon oil was 0.01% by weight relative to the total mass of the metal oxide particles and phenolic resin in the dispersion. The resulting mixture was stirred to prepare a solution. coating for a conductive layer. The coating solution for a conductive layer was applied to a support through the dip coating and the resulting coating film was dried and thermally cured at 150 ° C for 30 minutes.

As a result, a conductive layer having a thickness of 30 µm was obtained. COMPARATIVE EXAMPLE 1 An electrophotographic photosensitive component was prepared as in Example 1 except that a compound represented by the formula (C-1) below was used as the electron transport substance and a compound represented by (1-1) was used as the compound. isocyanate (crosslinking agent). The evaluation was conducted as in Example 1. The results are shown in Table 18. The number of atoms in the backbone of the backbone corresponding to D1 in the backbone represented by formula (1) was 4. (C-1) COMPARATIVE EXAMPLE 2 One The electrophotographic photosensitive component was prepared as in Example 1 except that a compound represented by the formula (C-2) below was used as the electron transport substance and a compound represented by (1-1) was used as the isocyanate compound (agent cross-linking). The evaluation was conducted as in Example 1. The results are shown in Table 18. The number of atoms in the backbone of the backbone corresponding to D1 in the backbone represented by formula (1) was 4. (C-2) COMPARATIVE EXAMPLE 3 One The electrophotographic photosensitive component was prepared as in Example 1 except that a block copolymer having a structure represented by the formula below disclosed in Japanese PCT Patent Publication No. 2009-505156 was used as an electron transport substance to form a base layer: The evaluation was conducted as in Example 1. The results are shown in Table 18. The number of atoms in the backbone of the backbone corresponding to D1 in the backbone represented by formula (1) was 25. COMPARATIVE EXAMPLE 4 One component Electrophotographic photosensitive was prepared as in Example 1 except that hexamethylene diisocyanate and a compound (11) below were used to form a base layer (embodiment of Example 1 disclosed in Japanese Open Patent No. 2007-148293): (11) Evaluation was conducted as in Example 1. Results are shown in Table 18.

Dissolution Test The coating solutions for a base layer prepared in Examples 1 to 116 were each uniformly applied in an amount of 0.5 g to an aluminum foil by a wire rod technique to form a coating film. The coating film was polymerized (cured) by heating at 160 ° C for 30 minutes to prepare a sample. A 100 mm x 50 mm specimen was taken from the central part of the sample and immersed in an anone / ethyl acetate mixture (weight ratio = 1: 1) at a temperature of 20 ° C for 10 minutes. Initial specimen weight before immersion and weight after immersion were measured. A coating film formed on the sample was scraped off and the weight of the aluminum foil was measured. Decrease in weight percentage (dissolved amount,%) after immersion was determined by the following equation: Decrease in weight percentage after immersion (%) = (initial weight - weight after immersion) / initial weight - slide weight. aluminum) x 100 Samples were evaluated as having sparingly dissolvable base layers when the percentage decrease in weight after immersion was 5% or less. As a result, the base layers formed in Examples 1 to 116 all exhibited a weight percent decrease after dipping of 5% or less and were sparingly dissolvable.

Table 15 Table 16 Table 17 In Tables 15, 16, and 17, “Electron Transport Substance Content” means the content of the electron transport substance in the coating solution for a base layer, “Isocyanate Compound Content” means the content of the isocyanate compound in the coating solution for a base layer, and "Resin (parts by mass)" means the content (parts by weight) of the resin in the coating solution for a base layer.

Example 60 and Comparative Examples 1 and 2 show that when the number of atoms of the main chain at D1 in the structure represented by formula (1) is less than 5, the effect of suppressing the fluctuation of positive double imaging cannot be sufficiently obtained. This is evident from the fact that the change in Macbeth density between the early stage and after repeated use of the production of 5000 impressions in the valuation method employed here is greater in the Comparative Examples than in the Example. The reason for this is presumably as follows. When the number of main chain atoms in D1 is less than 5, the bonding distance between the urethane bond and the electron transport structure is small and thus hydrolysis occurs through repeated use and the number of charge collectors. is increased. Example 13 and Comparative Example 3 show that when the number of D1 main chain atoms in the structure represented by formula (1) is less than 15, the effect of suppressing fluctuation of positive double imaging cannot be sufficiently This is evident from the fact that the change in Macbeth density between the early stage and after repeated use of the output of 5000 prints was greater in the Comparative Examples than in the Example. This is presumably due to the following reason. When the number of atoms of the main chain at D1 is greater than 15, the interaction between the isocyanurate structure part and the naphthalene carboxylic anhydride structure that serves as an electron transport structure in Comparative Example 3 does not occur easily and Conduction level becomes inhomogeneous, resulting in deterioration of the electron transport structure and increase in the number of charge collectors.

While the present invention has been described with reference to exemplary embodiments, it should be understood that the invention is not limited to the disclosed exemplary embodiments. The scope of the following claims should be in accordance with the broader interpretation to encompass all such modifications and equivalent structures and functions.

Claims (8)

1. Electrophotographic photosensitive component, characterized in that it comprises: a support; a base layer formed on the support; and a photosensitive layer formed on the base layer; wherein the base layer comprises a structure represented by formula (1) below (1) wherein, in formula (1), R 1 and R 3 each independently represent a substituted or unsubstituted alkylene group having from 1 to 10 chain atoms or a substituted or unsubstituted phenylene group, R2 represents a single bond, a substituted or unsubstituted alkylene group having from 1 to 10 main chain atoms, or a substituted or unsubstituted phenylene group, a substituent of the Substituted alkylene is an alkyl group, an aryl group, a hydroxy group, or a halogen atom, a substituted phenylene group substituent is a halogen atom, a nitro group, a cyano group, a group of hydroxy, an alkyl group, or a halogenated alkyl group, R 9 represents a hydrogen atom or an alkyl group, A1 represents a group represented by any of the formulas from (A-1) to (A-6) below, B1 represents a group represented by any of formulas (B-1) to (B-3) below, D1 represents a group having from 5 to 15 main chain atoms and being represented by formula (D) below, and E1 represents a divalent group represented by any of the formulas (E-1) to (E-8) below: (Α-5) (Α-6) where, in formula (A-5), R10 represents an atom of hydrogen or an alkyl group; where, in the formulas of (B-1) to (B-3), R 2 represents a single bond, a substituted or unsubstituted alkylene group having from 1 to 10 main chain atoms or a substituted or unsubstituted phenylene group, R 6 and R 7 each independently represent an alkylene group having from 1 to 5 atoms in the main chain, an alkylene group having from 1 to 5 atoms in the main chain and being substituted with an alkyl group having from 1 to 5 atoms in the parent chain. carbon, an alkylene group having from 1 to 5 main chain atoms and being substituted with a benzyl group, an alkylene group having from 1 to 5 main chain atoms and being substituted with an alkoxycarbonyl group, or a group of alkylene having from 1 to 5 main chain atoms and being substituted with a phenyl group, one of the carbon atoms in the main chain of the alkylene group may be substituted with O, S, NH or NR15, R15 representing an alkyl group, Ar2 represents a substituted or unsubstituted phenylene group, a substituted phenylene group substituent is a halogen atom, a nitro group, a hydroxy group, a cyano group, an alkyl group, or a halogenated alkyl group, R12 represents a hydrogen atom or an alkyl group, A1 and A2 each represent a group represented by any of the formulas (A-1) to (A-6) above, o, and independently independently represent 0 or 1 and the sum of o, p and q is from 1 to 3, and * represents a side on which R3 of formula (1) is attached; (D) wherein in formula (D) R 4, R 5, R® and R 7 each independently represent an alkylene group having from 1 to 5 main chain atoms, an alkylene group having from 1 to 5 main chain atoms and being substituted with an alkyl group having from 1 to 5 carbon atoms, an alkylene group having from 1 to 5 main chain atoms and being substituted with a benzyl group, an alkylene group having from 1 to 5 carbon atoms main chain and being substituted with an alkoxycarbonyl group, or an alkylene group having from 1 to 5 main chain atoms and being substituted with a phenyl group, one of the carbon atoms in the main chain of the alkylene group may be substituted with O, S, NH or NR15, R15 representing an alkyl group, Ar1 and Ar2 each independently represent a substituted or unsubstituted phenylene group, a substituent of the substituted phenylene group is a halogen atom, a nitro group, a hi group Doxy, a cyano group, an alkyl group, or a halogenated alkyl group, A2 represents a group represented by any of the formulas (A-1) to (A-6) above, and I, m, o, each independently represent 0 or 1, the sum of I, m and 1 is 1 to 3, and the sum of o, p and q is 1 to 3, and "(Ε-7) (Ε-8) where, in formulas from (E-1) to (E-8), two selected from X11 to X16, two selected from X21 to X29, two selected from X31 to X36, two selected from X41 to X48, two selected from X51 to X58, two selected X61 to X66, two selected from X71 to X78, and two selected from X81 to X88, each represents a single bond, the remainder of X11 to X16, X21 to X29, X31 to X36, X41 to X48, X51 to X58, X61 to X66, X71 to X78, X81 to X88 each independently represent a hydrogen atom, a halogen atom, an alkoxycarbonyl group, a carboxyl group, a damage group, a group of dialkylamino, a hydroxy group, a heterocyclic group, a nitro group, a substituted or unsubstituted alkoxy group, or a substituted or unsubstituted alkyl group, and Z51, Z52, Z61, Z62 and Z81 each independently represent an oxygen atom, a group of C ( CN) 2, or N-R 11, with R 11 representing a substituted or unsubstituted aryl group or a substituted or unsubstituted alkyl group. Electrophotographic photosensitive component according to claim 1, characterized in that the base layer comprises a cured product having the structure represented by formula (1). Electrophotographic photosensitive component according to claim 2, characterized in that the cured product still has a structure represented by the formula (2) below, '(2) where in formula (2) R 6 represents an alkyl group substituted or unsubstituted having from 1 to 5 carbon atoms, and a substituted alkyl group substituent is an alkyl group, an aryl group, or a halogen atom. Electrophotographic photosensitive component according to any one of claims 1 to 3, characterized in that D1 represents a group having from 10 to 15 main chain atoms and being represented by formula (D). Electrophotographic photosensitive component according to any one of claims 1 to 4, characterized in that, in formula (D), R 4 R 5 R 6 and R 7 each independently represent an alkylene group having from 1 to 5 chain atoms. and being substituted with a methyl group, an alkylene group having from 1 to 5 main chain atoms and being substituted with an ethyl group, or an alkylene group having from 1 to 5 main chain atoms. Electrophotographic photosensitive component according to any one of claims 1 to 5, characterized in that, in formula D, Ar1 and Ar2 each represent a phenylene group. A process cartridge detachably attached to a main body of an electrophotographic mechanism, characterized in that the process cartridge integrally supports: the electrophotographic photosensitive component of the type defined in any one of claims 1 to 6, and by at least one device selected from the group consisting of a charging device, a developing device, a transfer device and a cleaning device. Electrophotographic mechanism, characterized in that it comprises: the electrophotographic photosensitive component of the type defined in any one of claims 1 to 6; a loading device; an exposure device; a developing device; and a transfer device.