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1
US2019163078A1
Publication/Patent Number: US2019163078A1
Publication date: 2019-05-30
Application number: 16/201,713
Filing date: 2018-11-27
Abstract: An electrophotographic photosensitive member includes a support member, an electroconductive layer, and a photosensitive layer, in this order. The electroconductive layer contains a binder resin, electrically conductive first metal oxide particles, and second metal oxide particles. The refractive index Rb of the binder resin, the refractive index Rc of the first metal oxide particles, and the refractive index Rh of the second metal oxide particles satisfy the relationships: |Rb−Rc|≤0.35 and |Rb−Rh|≥0.65. The electroconductive layer has a volume resistivity of 1.0×106 Ω·cm to 1.0×1013 Ω·cm, and the ratio of the specific gravity of the first metal oxide particles to the specific gravity of the second metal oxide particles is 0.85 to 1.20. An electrophotographic photosensitive member includes a support member, an electroconductive layer, and a photosensitive layer, in this order. The electroconductive layer contains a binder resin, electrically conductive first metal oxide particles, and second metal oxide ...more ...less
2
US10303085B2
Publication/Patent Number: US10303085B2
Publication date: 2019-05-28
Application number: 15/992,605
Filing date: 2018-05-30
Abstract: Provided is an electrophotographic photosensitive member capable of achieving both high leak resistance and reduction in variations in dark part potential and bright part potential due to repeated use even when CB is used for an electrically conductive layer. An electrophotographic photosensitive member including: a support, an electrically conductive layer, and a photosensitive layer, sequentially, wherein the electrically conductive layer contains a binder resin and carbon black, a number average primary particle diameter of the carbon black is 200 nm or more and 500 nm or less, an average inter-particle distance of the carbon black is 200 nm or more and 600 nm or less, a coefficient of variation of an inter-particle distance is 1.2 or less, and SF-1 of the carbon black is 150 or less. Provided is an electrophotographic photosensitive member capable of achieving both high leak resistance and reduction in variations in dark part potential and bright part potential due to repeated use even when CB is used for an electrically conductive layer. An ...more ...less
3
US10216105B2
Publication/Patent Number: US10216105B2
Publication date: 2019-02-26
Application number: 15/903,802
Filing date: 2018-02-23
Abstract: An electrophotographic photosensitive member includes a support member, an electroconductive layer, and a photosensitive layer in this order. The electroconductive layer contains a binder and particles. Each of the particles include a core made of a substance represented by general formula (1), and a coating layer coating the core and containing an electrically conductive material: M1M2O3  (1) wherein M1 represents an element selected from the group consisting of Sr, Li, Na, K, and Ba, and M2 represents an element selected from the group consisting of Ti, Nb, Ta, and Zr. An electrophotographic photosensitive member includes a support member, an electroconductive layer, and a photosensitive layer in this order. The electroconductive layer contains a binder and particles. Each of the particles include a core made of a substance represented by ...more ...less
4
US10203617B2
Publication/Patent Number: US10203617B2
Publication date: 2019-02-12
Application number: 15/895,148
Filing date: 2018-02-13
Abstract: Provided is an electrophotographic photosensitive member which can simultaneously achieve less occurrence of leakage and the definition of an output image even when being an electrophotographic photosensitive member where a layer containing a metal oxide particle is adopted as an electroconductive layer, and which includes a support, an electroconductive layer and a photosensitive layer in this order, wherein the electroconductive layer contains a binder material and a particle represented by general formula (1): TiO2.00−XNY  (1) wherein Ti represents a titanium atom, O represents an oxygen atom, N represents a nitrogen atom and 0.00<Y<X≤0.60 is satisfied. Provided is an electrophotographic photosensitive member which can simultaneously achieve less occurrence of leakage and the definition of an output image even when being an electrophotographic photosensitive member where a layer containing a metal oxide particle is adopted as ...more ...less
6
US10152002B2
Publication/Patent Number: US10152002B2
Publication date: 2018-12-11
Application number: 15/904,055
Filing date: 2018-02-23
Abstract: An electrophotographic photosensitive member includes a support member, an electroconductive layer, and photosensitive layer in this order. The electroconductive layer contains a binder and particles. The particles have a core containing titanium oxide, and a coating layer coating the core and containing titanium oxide doped with niobium or tantalum. An electrophotographic photosensitive member includes a support member, an electroconductive layer, and photosensitive layer in this order. The electroconductive layer contains a binder and particles. The particles have a core containing titanium oxide, and a coating layer ...more ...less
7
US10162278B2
Publication/Patent Number: US10162278B2
Publication date: 2018-12-25
Application number: 15/901,128
Filing date: 2018-02-21
Abstract: Disclosed herein is an electrophotographic photosensitive member in which leakage hardly occurs even in the case of using a layer containing metal oxide particles as an electrically conductive layer in the electrophotographic photosensitive member, and which is compatible with definition in output images, the electrophotographic photosensitive member sequentially including: a support, an electrically conductive layer, and a photosensitive layer, the electrically conductive layer containing a binder material and particles represented by General Formula (1). Nb2.00O5.00-XNY  (1) (In Formula (1), Nb is a niobium atom, O is an oxygen atom, N is a nitrogen atom, and 0.00<Y<X≤4.00). Disclosed herein is an electrophotographic photosensitive member in which leakage hardly occurs even in the case of using a layer containing metal oxide particles as an electrically conductive layer in the electrophotographic photosensitive member, and which is compatible with ...more ...less
8
US2018348665A1
Publication/Patent Number: US2018348665A1
Publication date: 2018-12-06
Application number: 15/992,605
Filing date: 2018-05-30
Abstract: Provided is an electrophotographic photosensitive member capable of achieving both high leak resistance and reduction in variations in dark part potential and bright part potential due to repeated use even when CB is used for an electrically conductive layer. An electrophotographic photosensitive member including: a support, an electrically conductive layer, and a photosensitive layer, sequentially, wherein the electrically conductive layer contains a binder resin and carbon black, a number average primary particle diameter of the carbon black is 200 nm or more and 500 nm or less, an average inter-particle distance of the carbon black is 200 nm or more and 600 nm or less, a coefficient of variation of an inter-particle distance is 1.2 or less, and SF-1 of the carbon black is 150 or less. Provided is an electrophotographic photosensitive member capable of achieving both high leak resistance and reduction in variations in dark part potential and bright part potential due to repeated use even when CB is used for an electrically conductive layer. An ...more ...less
9
US2018246426A1
Publication/Patent Number: US2018246426A1
Publication date: 2018-08-30
Application number: 15/901,128
Filing date: 2018-02-21
Abstract: Disclosed herein is an electrophotographic photosensitive member in which leakage hardly occurs even in the case of using a layer containing metal oxide particles as an electrically conductive layer in the electrophotographic photosensitive member, and which is compatible with definition in output images, the electrophotographic photosensitive member sequentially including: a support, an electrically conductive layer, and a photosensitive layer, the electrically conductive layer containing a binder material and particles represented by General Formula (1). Nb2.00O5.00-XNY   (1) (In Formula (1), Nb is a niobium atom, O is an oxygen atom, N is a nitrogen atom, and 0.00<Y<X≤4.00.) Disclosed herein is an electrophotographic photosensitive member in which leakage hardly occurs even in the case of using a layer containing metal oxide particles as an electrically conductive layer in the electrophotographic photosensitive member, and which is compatible with ...more ...less
10
EP3413133A1
Publication/Patent Number: EP3413133A1
Publication date: 2018-12-12
Application number: 18175937.4
Filing date: 2018-06-05
Abstract: Provided is an electrophotographic photosensitive member capable of achieving both high leak resistance and reduction in variations in dark part potential and bright part potential due to repeated use even when CB is used for an electrically conductive layer. An electrophotographic photosensitive member including: a support, an electrically conductive layer, and a photosensitive layer, sequentially, wherein the electrically conductive layer contains a binder resin and carbon black, a number average primary particle diameter of the carbon black is 200 nm or more and 500 nm or less, an average inter-particle distance of the carbon black is 200 nm or more and 600 nm or less, a coefficient of variation of an inter-particle distance is 1.2 or less, and SF-1 of the carbon black is 150 or less. Provided is an electrophotographic photosensitive member capable of achieving both high leak resistance and reduction in variations in dark part potential and bright part potential due to repeated use even when CB is used for an electrically conductive layer. An ...more ...less
11
US2018246425A1
Publication/Patent Number: US2018246425A1
Publication date: 2018-08-30
Application number: 15/895,148
Filing date: 2018-02-13
Abstract: Provided is an electrophotographic photosensitive member which can simultaneously achieve less occurrence of leakage and the definition of an output image even when being an electrophotographic photosensitive member where a layer containing a metal oxide particle is adopted as an electroconductive layer, and which includes a support, an electroconductive layer and a photosensitive layer in this order, wherein the electroconductive layer contains a binder material and a particle represented by general formula (1): TiO2.00−XNY   (1) wherein Ti represents a titanium atom, O represents an oxygen atom, N represents a nitrogen atom and 0.00<Y<X≤0.60 is satisfied. Provided is an electrophotographic photosensitive member which can simultaneously achieve less occurrence of leakage and the definition of an output image even when being an electrophotographic photosensitive member where a layer containing a metal oxide particle is adopted as ...more ...less
12
US2018246441A1
Publication/Patent Number: US2018246441A1
Publication date: 2018-08-30
Application number: 15/904,055
Filing date: 2018-02-23
Abstract: An electrophotographic photosensitive member includes a support member, an electroconductive layer, and photosensitive layer in this order. The electroconductive layer contains a binder and particles. The particles have a core containing titanium oxide, and a coating layer coating the core and containing titanium oxide doped with niobium or tantalum. An electrophotographic photosensitive member includes a support member, an electroconductive layer, and photosensitive layer in this order. The electroconductive layer contains a binder and particles. The particles have a core containing titanium oxide, and a coating layer ...more ...less
13
EP3367168A1
Publication/Patent Number: EP3367168A1
Publication date: 2018-08-29
Application number: 18158550.6
Filing date: 2018-02-26
Abstract: An electrophotographic photosensitive member includes a support member (201), an electroconductive layer (202), and a photosensitive layer in this order. The electroconductive layer contains a binder and particles. Each of the particles include a core made of a substance represented by general formula (1), and a coating layer coating the core and containing an electrically conductive material:          M1M2O3     (1) wherein M1 represents an element selected from the group consisting of Sr, Li, Na, K, and Ba, and M2 represents an element selected from the group consisting of Ti, Nb, Ta, and Zr. An electrophotographic photosensitive member includes a support member (201), an electroconductive layer (202), and a photosensitive layer in this order. The electroconductive layer contains a binder and particles. Each of the particles include a core made of a substance ...more ...less
14
EP3367167A1
Publication/Patent Number: EP3367167A1
Publication date: 2018-08-29
Application number: 18155520.2
Filing date: 2018-02-07
Abstract: An electrophotographic photosensitive member includes a support member (201), an electroconductive layer (202), and a photosensitive layer in this order. The electroconductive layer contains a binder and particles. The particles have a core containing titanium oxide, and a coating layer coating the core and containing titanium oxide doped with niobium or tantalum. An electrophotographic photosensitive member includes a support member (201), an electroconductive layer (202), and a photosensitive layer in this order. The electroconductive layer contains a binder and particles. The particles have a core containing titanium oxide, and a ...more ...less
15
EP3367169A1
Publication/Patent Number: EP3367169A1
Publication date: 2018-08-29
Application number: 18158551.4
Filing date: 2018-02-26
Abstract: Disclosed herein is an electrophotographic photosensitive member in which leakage hardly occurs even in the case of using a layer containing metal oxide particles as an electrically conductive layer in the electrophotographic photosensitive member, and which is compatible with definition in output images, the electrophotographic photosensitive member sequentially including: a support, an electrically conductive layer, and a photosensitive layer, the electrically conductive layer containing a binder material and particles represented by General Formula (1).         N b2.00O5.00-XNY .........     (1) (In Formula (1), Nb is a niobium atom, O is an oxygen atom, N is a nitrogen atom, and 0.00 < Y < X ≤ 4.00.) Disclosed herein is an electrophotographic photosensitive member in which leakage hardly occurs even in the case of using a layer containing metal oxide particles as an electrically conductive layer in the electrophotographic photosensitive member, and which is compatible with ...more ...less
16
US9857704B2
Publication/Patent Number: US9857704B2
Publication date: 2018-01-02
Application number: 14/832,720
Filing date: 2015-08-21
Abstract: A process cartridge includes an electrophotographic photosensitive member and a gap retaining member, where the electrophotographic photosensitive member includes a first region having an undercoat layer, a charge generating layer, and a charge transporting layer on a support in this order and a second region having an undercoat layer and a charge transporting layer on a support in this order, the undercoat layer contains a metal oxide particle and any one of an urethane resin, an amino resin, and a polyamide resin as a binder resin, and the charge transporting layer contains a charge transporting substance and at least one selected from the group consisting of a polycarbonate resin and a polyester resin, and where the gap retaining member comes into contact with a surface of the second region of the electrophotographic photosensitive member. A process cartridge includes an electrophotographic photosensitive member and a gap retaining member, where the electrophotographic photosensitive member includes a first region having an undercoat layer, a charge generating layer, and a charge transporting layer on a support in ...more ...less
17
US2018246427A1
Publication/Patent Number: US2018246427A1
Publication date: 2018-08-30
Application number: 15/903,802
Filing date: 2018-02-23
Abstract: An electrophotographic photosensitive member includes a support member, an electroconductive layer, and a photosensitive layer in this order. The electroconductive layer contains a binder and particles. Each of the particles include a core made of a substance represented by general formula (1), and a coating layer coating the core and containing an electrically conductive material: M1M2O3  (1) wherein M1 represents an element selected from the group consisting of Sr, Li, Na, K, and Ba, and M2 represents an element selected from the group consisting of Ti, Nb, Ta, and Zr. An electrophotographic photosensitive member includes a support member, an electroconductive layer, and a photosensitive layer in this order. The electroconductive layer contains a binder and particles. Each of the particles include a core made of a substance represented by ...more ...less
18
US9864284B2
Publication/Patent Number: US9864284B2
Publication date: 2018-01-09
Application number: 15/054,009
Filing date: 2016-02-25
Abstract: An electrophotographic photosensitive member has a support, a charge generation layer, and a charge transport layer in this order, the charge transport layer containing a charge transport material. The charge transport layer is a surface layer of the electrophotographic photosensitive member and contains a polycarbonate resin having a structural unit selected from group A and a structural unit selected from group B. An electrophotographic photosensitive member has a support, a charge generation layer, and a charge transport layer in this order, the charge transport layer containing a charge transport material. The charge transport layer is a surface layer of the electrophotographic ...more ...less
19
EP3062153B1
Publication/Patent Number: EP3062153B1
Publication date: 2018-09-26
Application number: 16156831.6
Filing date: 2016-02-23
Abstract: An electrophotographic photosensitive member (1) has a support, a charge generation layer, and a charge transport layer in this order, the charge transport layer containing a charge transport material. The charge transport layer is a surface layer of the electrophotographic photosensitive member and contains a polycarbonate resin having a structural unit selected from group A and a structural unit selected from group B (groups A and B defined in the disclosure). An electrophotographic photosensitive member (1) has a support, a charge generation layer, and a charge transport layer in this order, the charge transport layer containing a charge transport material. The charge transport layer is a surface layer of the electrophotographic ...more ...less
20
JP2017142369A
Publication/Patent Number: JP2017142369A
Publication date: 2017-08-17
Application number: 2016023765
Filing date: 2016-02-10
Assignee: CANON INC
Abstract: PROBLEM TO BE SOLVED: To provide an electrophotographic device and a process cartridge that can reduce local wear of an electrophotographic photoreceptor and can be used for a long period of time.SOLUTION: The electrophotographic device includes: an electrophotographic photoreceptor having a charge generating layer and a surface layer in this order; charging means that does not come in contact with the electrophotographic photoreceptor; cleaning means or developing means that comes in contact with the electrophotographic photoreceptor; and transfer means. The device satisfies relationships represented by expressions (1): L1 PROBLEM TO BE SOLVED: To provide an electrophotographic device and a process cartridge that can reduce local wear of an electrophotographic photoreceptor and can be used for a long period of time.SOLUTION: The electrophotographic device includes: an electrophotographic ...more ...less