CN-122018259-A - Electrophotographic photoreceptor, process cartridge, and image forming apparatus

CN122018259ACN 122018259 ACN122018259 ACN 122018259ACN-122018259-A

Abstract

An electrophotographic photoreceptor, a process cartridge, and an image forming apparatus, the electrophotographic photoreceptor including a conductive substrate, and a photosensitive layer disposed on the conductive substrate and having a charge generation layer and a charge transport layer, wherein the charge transport layer contains a charge transport material, at least one dicarboxylic acid unit selected from the group consisting of a dicarboxylic acid unit (A2) represented by the following formula (A2), a dicarboxylic acid unit (A3) represented by the formula (A3), a dicarboxylic acid unit (A4) represented by the formula (A4), and a dicarboxylic acid unit (A5) represented by the formula (A5), and a polyarylate resin having a diol unit represented by the formula (B), and the charge generation layer contains a butanediol adduct of an oxytitanium phthalocyanine as a charge generation material. [ chemical formula 1] formula (A2) Equation (A3) Formula (A4) Equation (A5) [ Chemical formula 2] formula (B)

Inventors

FUJII RYOUSUKE
SASAKI TOMOYA
Kusano Kawoo
Okazaki Youdu
KANO FUYUKI
Kiko Youchi
OYAMADA YUKI
GAO YANGPING
NARITA KOSUKE

Assignees

富士胶片商业创新有限公司

Dates

Publication Date: 20260512
Application Date: 20250428
Priority Date: 20241111

Claims (10)

1. An electrophotographic photoreceptor comprising: Conductive matrix, and A photosensitive layer disposed on the conductive substrate and having a charge generation layer and a charge transport layer, wherein, The charge transport layer contains a charge transport material, at least one dicarboxylic acid unit selected from the group consisting of a dicarboxylic acid unit (A2) represented by the following formula (A2), a dicarboxylic acid unit (A3) represented by the following formula (A3), a dicarboxylic acid unit (A4) represented by the following formula (A4) and a dicarboxylic acid unit (A5) represented by the following formula (A5), and a polyarylate resin having a diol unit represented by the following formula (B), The charge generation layer contains a butanediol adduct of oxytitanium phthalocyanine as a charge generation material, [ Chemical formula 1] [ Chemical formula 2] In formula (A2), n 201 and n 202 are each independently an integer of 0 to 4, and n 201 Ra 201 and n 202 Ra 202 are each independently an alkyl group having 1 to 10 carbon atoms, an aryl group having 6 to 12 carbon atoms, or an alkoxy group having 1 to 6 carbon atoms; In formula (A3), n 301 and n 302 are each independently an integer of 0 to 4, and n 301 Ra 301 and n 302 Ra 302 are each independently an alkyl group having 1 to 10 carbon atoms, an aryl group having 6 to 12 carbon atoms, or an alkoxy group having 1 to 6 carbon atoms; In the formula (A4), n 401 is an integer of 0 to 6, and n 401 Ra 401 are each independently an alkyl group having 1 to 10 carbon atoms, an aryl group having 6 to 12 carbon atoms, or an alkoxy group having 1 to 6 carbon atoms; In formula (A5), n 501 、n 502 and n 503 are each independently an integer of 0 to 4, and n 501 Ra 501 、n 502 Ra 502 and n 503 Ra 503 are each independently an alkyl group having 1 to 10 carbon atoms, an aryl group having 6 to 12 carbon atoms, or an alkoxy group having 1 to 6 carbon atoms; In the formula (B), ar B1 and Ar B2 are each independently an aromatic ring which may have a substituent, L B is a single bond, an oxygen atom, a sulfur atom or-C (Rb 1 )(Rb 2 )-,n B1 is 0, 1 or 2; rb 1 and Rb 2 are each independently a hydrogen atom, an alkyl group having 1 to 20 carbon atoms, an aryl group having 6 to 12 carbon atoms or an aralkyl group having 7 to 20 carbon atoms, or Rb 1 and Rb 2 may be bonded to form a cyclic alkyl group.
2. The electrophotographic photoreceptor according to claim 1, wherein, The butylene glycol adduct of oxytitanium phthalocyanine comprises a2, 3-butylene glycol adduct of oxytitanium phthalocyanine.
3. The electrophotographic photoreceptor according to claim 1 or 2, wherein, The charge generation layer contains a butylene glycol adduct of oxytitanium phthalocyanine and a non-adduct of oxytitanium phthalocyanine as a charge generation material, and the ratio of the butylene glycol adduct of oxytitanium phthalocyanine in the total of both is 30 mol% or more and 90 mol% or less.
4. The electrophotographic photoreceptor according to any of claim 1 to 3, wherein, The diol unit represented by the formula (B) comprises at least one selected from the group consisting of a diol unit (B1) represented by the following formula (B1), a diol unit (B2) represented by the formula (B2), a diol unit (B3) represented by the formula (B3), a diol unit (B4) represented by the formula (B4), a diol unit (B5) represented by the formula (B5), a diol unit (B6) represented by the formula (B6), a diol unit (B7) represented by the formula (B7) and a diol unit (B8) represented by the formula (B8), [ Chemical formula 3] [ Chemical formula 4] In the formula (B1), rb 101 is a branched alkyl group having 4 to 20 carbon atoms, rb 201 is a hydrogen atom or an alkyl group having 1 to 3 carbon atoms, and Rb 401 、Rb 501 、Rb 801 and Rb 901 are each independently a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, an alkoxy group having 1 to 6 carbon atoms, or a halogen atom; In the formula (B2), rb 102 is a linear alkyl group having 4 to 20 carbon atoms, rb 202 is a hydrogen atom or an alkyl group having 1 to 3 carbon atoms, and Rb 402 、Rb 502 、Rb 802 and Rb 902 are each independently a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, an alkoxy group having 1 to 6 carbon atoms, or a halogen atom; In formula (B3), rb 113 and Rb 213 are each independently a hydrogen atom, a linear alkyl group having 1 to 3 carbon atoms, an alkoxy group having 1 to 4 carbon atoms, or a halogen atom, d is an integer of 7 to 15, and Rb 403 、Rb 503 、Rb 803 and Rb 903 are each independently a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, an alkoxy group having 1 to 6 carbon atoms, or a halogen atom; In the formula (B4), rb 104 and Rb 204 are each independently a hydrogen atom or an alkyl group having 1 to 3 carbon atoms, and Rb 404 、Rb 504 、Rb 804 and Rb 904 are each independently a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, an alkoxy group having 1 to 6 carbon atoms, or a halogen atom; In the formula (B5), ar 105 is an aryl group having 6 to 12 carbon atoms or an aralkyl group having 7 to 20 carbon atoms, rb 205 is a hydrogen atom or an alkyl group having 1 to 3 carbon atoms, and Rb 405 、Rb 505 、Rb 805 and Rb 905 are each independently a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, an alkoxy group having 1 to 6 carbon atoms or a halogen atom; In formula (B6), rb 116 and Rb 216 are each independently a hydrogen atom, a linear alkyl group having 1 to 3 carbon atoms, an alkoxy group having 1 to 4 carbon atoms, or a halogen atom, e is an integer of 4 to 6, and Rb 406 、Rb 506 、Rb 806 and Rb 906 are each independently a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, an alkoxy group having 1 to 6 carbon atoms, or a halogen atom; in the formula (B7), rb 407 、Rb 507 、Rb 807 and Rb 907 are each independently a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, an alkoxy group having 1 to 6 carbon atoms, or a halogen atom; in formula (B8), rb 408 、Rb 508 、Rb 808 and Rb 908 are each independently a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, an alkoxy group having 1 to 6 carbon atoms, or a halogen atom.
5. The electrophotographic photoreceptor according to any of claims 1 to 4, wherein, The polyarylate resin comprises a polyarylate resin having structural units comprising biphenyls represented by the following formula (BP), [ Chemical formula 5] In the formula (BP), j is an integer of 0 to 4, j R 1 are each independently methyl or ethyl, k is an integer of 0 to 4, and k R 2 are each independently methyl or ethyl.
6. The electrophotographic photoreceptor according to any of claims 1 to 5, wherein, The charge transport layer also contains a polycarbonate resin.
7. The electrophotographic photoreceptor according to claim 6, wherein, The polycarbonate resin comprises a polycarbonate resin having a structural unit comprising biphenyl represented by the following formula (BP), [ Chemical formula 6] In the formula (BP), j is an integer of 0 to 4, j R 1 are each independently methyl or ethyl, k is an integer of 0 to 4, and k R 2 are each independently methyl or ethyl.
8. The electrophotographic photoreceptor according to claim 6 or 7, wherein, The ratio of the polyarylate resin to the total amount of the polyarylate resin and the polycarbonate resin contained in the charge transport layer is 25 mass% or more and 75 mass% or less.
9. A process cartridge provided with the electrophotographic photoreceptor as claimed in any one of claim 1 to 8, The process cartridge is attached to and detached from the image forming apparatus.
10. An image forming apparatus includes: the electrophotographic photoreceptor of any one of claims 1 to 8; A charging device for charging a surface of the electrophotographic photoreceptor; An electrostatic latent image forming device that forms an electrostatic latent image on a surface of the charged electrophotographic photoreceptor; a developing device for developing an electrostatic latent image formed on the surface of the electrophotographic photoreceptor by a developer containing a toner to form a toner image, and And a transfer device for transferring the toner image onto the surface of the recording medium.

Description

Electrophotographic photoreceptor, process cartridge, and image forming apparatus Technical Field The invention relates to an electrophotographic photoreceptor, a process cartridge, and an image forming apparatus. Background Patent document 1 discloses an electrophotographic photoreceptor in which a photosensitive layer contains a oxytitanium phthalocyanine crystal which is an adduct of oxytitanium phthalocyanine and 2, 3-butanediol. Patent document 2 discloses an electrophotographic photoreceptor in which a reaction product of a oxytitanium phthalocyanine compound and (2 r,3 r) - (-) -2, 3-butanediol and/or (2 s,3 s) - (+) -2, 3-butanediol is contained as a charge generating material of a photosensitive layer. Patent document 3 discloses an electrophotographic photoreceptor including a polyester resin having a biphenyl structure as a repeating unit and practically no terephthalic acid unit in a photosensitive layer. Patent document 4 discloses an electrophotographic photoreceptor containing, as a charge generating substance, an oxytitanium phthalocyanine pigment in which a main peak of bragg angle 2θ in an X-ray diffraction spectrum with respect to cu—kα rays falls at least at 26.2 ° ± 0.2 °. Patent document 5 discloses an organic photoreceptor in which a charge generation layer contains 2, 3-butanediol adduct oxytitanium phthalocyanine and non-added oxytitanium phthalocyanine. Patent document 6 discloses an electrophotographic photoreceptor in which a charge transport layer contains a polyarylate resin and a phthalocyanine pigment. Patent document 1 Japanese patent laid-open No. 05-273775 Patent document 2 Japanese patent laid-open No. 09-043877 Patent document 3 Japanese patent application laid-open No. 2001-265021 Patent document 4 Japanese patent laid-open No. 2001-318476 Patent document 5 Japanese patent application laid-open No. 2014-137445 Patent document 6 Japanese patent application laid-open No. 2022-181415 Disclosure of Invention The invention provides an electrophotographic photoreceptor which has excellent environmental stability of electrical characteristics and is not easy to peel a photosensitive layer. Specific means for solving the above problems include the following means. The formulae are the same as those of the same numbers described below. <1> An electrophotographic photoreceptor comprising: Conductive matrix, and A photosensitive layer disposed on the conductive substrate and having a charge generation layer and a charge transport layer, wherein, The charge transport layer contains a charge transport material, at least one dicarboxylic acid unit selected from the group consisting of a dicarboxylic acid unit (A2) represented by the formula (A2), a dicarboxylic acid unit (A3) represented by the formula (A3), a dicarboxylic acid unit (A4) represented by the formula (A4) and a dicarboxylic acid unit (A5) represented by the formula (A5), and a polyarylate resin having a diol unit represented by the formula (B), The charge generation layer contains a butanediol adduct of oxytitanium phthalocyanine as a charge generation material. <2> The electrophotographic photoreceptor according to <1>, wherein, The butylene glycol adduct of oxytitanium phthalocyanine comprises a2, 3-butylene glycol adduct of oxytitanium phthalocyanine. <3> The electrophotographic photoreceptor according to <1> or <2>, wherein, The charge generation layer contains a butylene glycol adduct of oxytitanium phthalocyanine and a non-adduct of oxytitanium phthalocyanine as a charge generation material, and the ratio of the butylene glycol adduct of oxytitanium phthalocyanine in the total of both is 30 mol% or more and 90 mol% or less. <4> The electrophotographic photoreceptor according to any of <1> to <3>, wherein, The diol unit represented by the formula (B) includes at least one selected from the group consisting of a diol unit (B1) represented by the formula (B1), a diol unit (B2) represented by the formula (B2), a diol unit (B3) represented by the formula (B3), a diol unit (B4) represented by the formula (B4), a diol unit (B5) represented by the formula (B5), a diol unit (B6) represented by the formula (B6), a diol unit (B7) represented by the formula (B7), and a diol unit (B8) represented by the formula (B8). <5> The electrophotographic photoreceptor according to any of <1> to <4>, wherein, The polyarylate resin comprises a polyarylate resin having structural units comprising biphenyls represented by formula (BP). <6> The electrophotographic photoreceptor according to any of <1> to <5>, wherein, The charge transport layer also contains a polycarbonate resin. <7> The electrophotographic photoreceptor according to <6>, wherein, The polycarbonate resin comprises a polycarbonate resin having a structural unit comprising biphenyl represented by formula (BP). <8> The electrophotographic photoreceptor according to <6> or <7>, wherein, The ratio of the polyarylate resin to the total amount of the polyarylate resin and the poly