CN-122018268-A - Image forming apparatus having a plurality of image forming units

CN122018268ACN 122018268 ACN122018268 ACN 122018268ACN-122018268-A

Abstract

An image forming apparatus includes an electrophotographic photoreceptor having a conductive substrate and a photosensitive layer disposed on the conductive substrate, and a charging device having a charging member for charging a surface of the electrophotographic photoreceptor and a cleaning member disposed in contact with the charging member, wherein an outermost layer of the electrophotographic photoreceptor includes a charge transport material and a polyarylate resin having a dicarboxylic acid unit represented by the following formula (A) and a diol unit represented by the following formula (B), and the cleaning member has a plug and a foamed elastic layer spirally disposed on an outer peripheral surface of the plug, and a ratio T/W of a thickness T of the foamed elastic layer to a width W of the foamed elastic layer is 0.6 or more and 1.2 or less. [ chemical formula 1] formula (A) Equation (B)

Inventors

KANO FUYUKI
Kiko Youchi
OYAMADA YUKI
GAO YANGPING
Kusano Kawoo
SASAKI TOMOYA
IDE KENTA

Assignees

富士胶片商业创新有限公司

Dates

Publication Date: 20260512
Application Date: 20250507
Priority Date: 20241111

Claims (8)

1. An image forming apparatus includes: electrophotographic photoreceptor, and A charging device having a charging member for charging the surface of the electrophotographic photoreceptor and a cleaning member disposed in contact with the charging member, The electrophotographic photoreceptor has a conductive substrate and a photosensitive layer disposed on the conductive substrate, and the outermost layer of the electrophotographic photoreceptor contains a charge transport material and a polyarylate resin having a dicarboxylic acid unit represented by the following formula (A) and a diol unit represented by the following formula (B), The cleaning member has a mandrel and a foamed elastic layer spirally provided on the outer peripheral surface of the mandrel, The ratio T/W of the thickness T of the foamed elastic layer to the width W of the foamed elastic layer is 0.6 or more and 1.2 or less, [ Chemical formula 1] In the formula (a), ar A1 and Ar A2 are each independently an aromatic ring which may have a substituent, L A is a single bond or a 2-valent linking group, and n A1 is 0,1 or 2; 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 image forming apparatus according to claim 1, wherein, The coverage area ratio A of the foaming elastic layer arranged on the cleaning component is more than 20 area percent and less than 60 area percent.
3. The image forming apparatus according to claim 1 or 2, wherein, The surface roughness Rz of the charged member is 5-10 [ mu ] m.
4. The image forming apparatus according to any one of claims 1 to 3, wherein, The outermost layer of the electrophotographic photoreceptor further contains a polycarbonate resin.
5. The image forming apparatus according to claim 4, wherein, The mass ratio of the polyarylate resin to the polycarbonate resin in the outermost layer of the electrophotographic photoreceptor is 3:7 to 7:3.
6. The image forming apparatus according to any one of claims 1 to 5, wherein, The dicarboxylic acid unit represented by the formula (A) comprises at least one selected from the group consisting of a dicarboxylic acid unit (A1) represented by the following formula (A1), 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), [ Chemical formula 2] In the formula (A1), n 101 is an integer of 0 to 4, and n 101 Ra 101 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 (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.
7. The image forming apparatus according to any one of claims 1 to 6, 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.
8. The image forming apparatus according to claim 4, wherein, The polyarylate resin and the polycarbonate resin each have a structural unit comprising biphenyl 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.

Description

Image forming apparatus having a plurality of image forming units Technical Field The present invention relates to an image forming apparatus. Background Patent document 1 discloses an image forming apparatus in which a latent image holder is charged by a charging member which is brought into contact with the latent image holder and rotates in a driven manner, the charged latent image holder is exposed to light to form an electrostatic latent image, the electrostatic latent image is developed by a toner carried by a toner carrier to form a toner image, the toner image formed on the latent image holder is transferred onto a transfer material by a transfer member which is brought into contact with and rotates with the latent image holder, transfer residual toner remaining on the latent image holder after transfer is recovered by a cleaning unit, and the toner image on the transferred transfer material is fixed onto the transfer material by a fixing unit, the image forming apparatus being characterized in that the charging member has a material having a high release property on a surface, the transfer member is composed of a foam, and a surface layer is provided on the surface. Patent document 2 discloses a charging device including a charging member and a cleaning member having a core and an elastic layer including silicone oil and disposed in a spiral shape on an outer peripheral surface of the core, wherein a maximum value of a content of Si atoms constituting a siloxane skeleton in a contact portion, which is a region in contact with the elastic layer, and a content of Si atoms constituting a siloxane skeleton in a non-contact portion, which is a region not in contact with the elastic layer, among contents of Si atoms constituting a siloxane skeleton relative to total atoms, obtained by analyzing a surface of the charging member by X-ray photoelectron spectroscopy after the elastic layer in an initial state is brought into contact with the charging member for 24 hours, is 6 atomic% or less. Patent document 3 discloses a positively-charged layered electrophotographic photoreceptor in which a charge transport layer composed of at least a hole transport material and a binder resin and a charge generation/transport layer composed of at least a charge generation material, an electron transport material, a hole transport material and a binder resin are sequentially layered on a conductive substrate, wherein the binder resin in the charge transport layer contains a polyarylate resin, the thickness of the charge transport layer is 10 to 40 μm, and the thickness of the charge generation/transport layer is 3 to 20 μm. Patent document 1 Japanese patent laid-open publication No. 2005-309039 Patent document 2 Japanese patent application laid-open No. 2012-78518 Patent document 3 Japanese patent application laid-open No. 2014-146001 Disclosure of Invention The object of the present invention is to provide an image forming apparatus having excellent wear inhibition of a photoreceptor and contamination inhibition of a charging member, compared with a case where the outermost layer of an electrophotographic photoreceptor does not contain a charge transporting material, a polyarylate resin having a dicarboxylic acid unit represented by the following formula (A) and a diol unit represented by the following formula (B), or a cleaning member having a mandrel and a foamed elastic layer provided in a spiral shape on the outer peripheral surface of the mandrel, wherein the ratio T/W of the thickness T of the foamed elastic layer to the width W of the foamed elastic layer is less than 0.6 or more than 1.2. The means for solving the above problems include the following means. An image forming apparatus includes an electrophotographic photoreceptor having a conductive substrate and a photosensitive layer disposed on the conductive substrate, and a charging device having a charging member for charging a surface of the electrophotographic photoreceptor and a cleaning member disposed in contact with the charging member, wherein an outermost layer of the electrophotographic photoreceptor includes a charge transport material and a polyarylate resin having a dicarboxylic acid unit represented by the following formula (A) and a diol unit represented by the following formula (B), the cleaning member has a mandrel and a foamed elastic layer spirally disposed on an outer peripheral surface of the mandrel, and a ratio T/W of a thickness T of the foamed elastic layer to a width W of the foamed elastic layer is 0.6 or more and 1.2 or less. [ Chemical formula 1] (A) (B) In formula (a), ar A1 and Ar A2 are each independently an aromatic ring which may have a substituent, L A is a single bond or a 2-valent linking group, and n A1 is 0, 1 or 2. 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)(Rb2)-,nB1 is 0, 1 or 2.rb 1 and Rb 2 a