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1
US2019243260A1
Publication/Patent Number: US2019243260A1
Publication date: 2019-08-08
Application number: 16/269,304
Filing date: 2019-02-06
Abstract: An electrophotographic photosensitive member including: a support, an undercoat layer formed above the support, a charge generation layer formed on the undercoat layer, and a charge transport layer formed above the charge generation layer, wherein the undercoat layer contains a polyamide resin and a titanium oxide particle which is surface-treated with a compound represented by Formula (1): when a volume of the titanium oxide particles to a volume of the polyamide resin in the undercoat layer is a, and an average primary particle diameter of the titanium oxide particles is b [μm], the following Equation (A) is satisfied: Equation (A): 14.0≤a/b≤19.1; and the charge generation layer contains a charge generating material and a thermoplastic resin having a hydroxyl group and a hydroxyl number of 50 mgKOH/g or more. An electrophotographic photosensitive member including: a support, an undercoat layer formed above the support, a charge generation layer formed on the undercoat layer, and a charge transport layer formed above the charge generation layer, wherein the undercoat layer contains a ...more ...less
2
EP3525042A1
Publication/Patent Number: EP3525042A1
Publication date: 2019-08-14
Application number: 19155672.9
Filing date: 2019-02-06
Abstract: An electrophotographic photosensitive member including: a support, an undercoat layer formed above the support, a charge generation layer formed on the undercoat layer, and a charge transport layer formed above the charge generation layer, wherein the undercoat layer contains a polyamide resin and a titanium oxide particle which is surface-treated with a compound represented by Formula (1), when a volume of the titanium oxide particles to a volume of the polyamide resin in the undercoat layer is a, and an average primary particle diameter of the titanium oxide particles is b [µm], the following Equation (A) is satisfied: Equation (A): 14.0 ≤ a/b ≤ 19.1; and the charge generation layer contains a charge generating material and a thermoplastic resin having a hydroxyl group and a hydroxyl number of 50 mgKOH/g or more. An electrophotographic photosensitive member including: a support, an undercoat layer formed above the support, a charge generation layer formed on the undercoat layer, and a charge transport layer formed above the charge generation layer, wherein the undercoat layer contains a ...more ...less
3
US2019121251A1
Publication/Patent Number: US2019121251A1
Publication date: 2019-04-25
Application number: 16/230,617
Filing date: 2018-12-21
Abstract: An electrophotographic photosensitive member includes a support, a charge generating layer containing a charge generation material, and a charge transporting layer containing a charge transport material in this order, the charge transporting layer serving as a surface layer. The charge transporting layer contains a polycarbonate resin having a particular structural unit. An electrophotographic photosensitive member includes a support, a charge generating layer containing a charge generation material, and a charge transporting layer containing a charge transport material in this order, the charge transporting layer serving as a surface layer. The ...more ...less
4
US10209637B2
Publication/Patent Number: US10209637B2
Publication date: 2019-02-19
Application number: 15/663,421
Filing date: 2017-07-28
Abstract: An electrophotographic photosensitive member includes a support, a charge generating layer containing a charge generation material, and a charge transporting layer containing a charge transport material in this order, the charge transporting layer serving as a surface layer. The charge transporting layer contains a polycarbonate resin having a particular structural unit. An electrophotographic photosensitive member includes a support, a charge generating layer containing a charge generation material, and a charge transporting layer containing a charge transport material in this order, the charge transporting layer serving as a surface layer. The ...more ...less
5
US10416581B2
Publication/Patent Number: US10416581B2
Publication date: 2019-09-17
Application number: 15/667,715
Filing date: 2017-08-03
Abstract: An electrophotographic photosensitive member with suppressed potential variation even in the case that a protective layer including a cured material of a composition having a polymerizable functional group is used is provided. An electrophotographic photosensitive member including a support, a charge generation layer, a charge transport layer containing a charge transporting material, and a protective layer, in the order presented, wherein the charge transport layer contains a polycarbonate resin having a structure selected from a group A and a structure selected from a group B, and the protective layer includes a cured material of a composition containing a compound having at least a functional group selected from chain-polymerizable functional groups and sequential polymerizable functional groups. An electrophotographic photosensitive member with suppressed potential variation even in the case that a protective layer including a cured material of a composition having a polymerizable functional group is used is provided. An electrophotographic photosensitive member ...more ...less
6
US10401746B2
Publication/Patent Number: US10401746B2
Publication date: 2019-09-03
Application number: 15/961,756
Filing date: 2018-04-24
Abstract: An electrophotographic photosensitive member includes a support member, a charge generating layer containing a phthalocyanine pigment as a charge generating material, a charge transport layer containing a charge transporting material in this order. The charge generating layer has a thickness of less than 200 nm, and the phthalocyanine pigment includes phthalocyanine crystalline particles having a particle size distribution and satisfies a requirement that the volume average of the products of Φi and Ψi is 0.31 or more. An electrophotographic photosensitive member includes a support member, a charge generating layer containing a phthalocyanine pigment as a charge generating material, a charge transport layer containing a charge transporting material in this order. The charge generating layer ...more ...less
7
JP2018045138A
Publication/Patent Number: JP2018045138A
Publication date: 2018-03-22
Application number: 2016180807
Filing date: 2016-09-15
Assignee: CANON INC
Abstract: PROBLEM TO BE SOLVED: To provide an electrophotographic photoreceptor having excellent electrical characteristics, with endurance potential variations reduced.SOLUTION: A electrophotographic photoreceptor has a support, a charge generating layer, and a charge transportation layer, in the stated order, the charge transportation layer containing a polycarbonate resin having a structural unit represented by formula (1). In the charge transportation layer, the content of a compound having a phenolic hydroxyl group is 500 ppm or less.SELECTED DRAWING: None PROBLEM TO BE SOLVED: To provide an electrophotographic photoreceptor having excellent electrical characteristics, with endurance potential variations reduced.SOLUTION: A electrophotographic photoreceptor has a support, a charge generating layer, and a charge transportation ...more ...less
8
CN107678254A
Publication/Patent Number: CN107678254A
Publication date: 2018-02-09
Application number: 201710637340
Filing date: 2017-07-31
Abstract: The invention provides an electrophotographic photosensitive member, a process cartridge, and an electrophotographic apparatus. The electrophotographic photosensitive member includes a support, a charge generating layer containing a charge generation material, and a charge transporting layer containing a charge transport material in this order, the charge transporting layer serving as a surface layer. The charge transporting layer contains a polycarbonate resin having a particular structural unit. The invention provides an electrophotographic photosensitive member, a process cartridge, and an electrophotographic apparatus. The electrophotographic photosensitive member includes a support, a charge generating layer containing a charge generation material, and a charge ...more ...less
9
US2018059558A1
Publication/Patent Number: US2018059558A1
Publication date: 2018-03-01
Application number: 15/667,715
Filing date: 2017-08-03
Abstract: An electrophotographic photosensitive member with suppressed potential variation even in the case that a protective layer including a cured material of a composition having a polymerizable functional group is used is provided. An electrophotographic photosensitive member including a support, a charge generation layer, a charge transport layer containing a charge transporting material, and a protective layer, in the order presented, wherein the charge transport layer contains a polycarbonate resin having a structure selected from a group A and a structure selected from a group B, and the protective layer includes a cured material of a composition containing a compound having at least a functional group selected from chain-polymerizable functional groups and sequential polymerizable functional groups. An electrophotographic photosensitive member with suppressed potential variation even in the case that a protective layer including a cured material of a composition having a polymerizable functional group is used is provided. An electrophotographic photosensitive member ...more ...less
10
US2018314171A1
Publication/Patent Number: US2018314171A1
Publication date: 2018-11-01
Application number: 15/961,756
Filing date: 2018-04-24
Abstract: An electrophotographic photosensitive member includes a support member, a charge generating layer containing a phthalocyanine pigment as a charge generating material, a charge transport layer containing a charge transporting material in this order. The charge generating layer has a thickness of less than 200 nm, and the phthalocyanine pigment includes phthalocyanine crystalline particles having a particle size distribution and satisfies a requirement that the volume average of the products of Φi and Ψi is 0.31 or more. An electrophotographic photosensitive member includes a support member, a charge generating layer containing a phthalocyanine pigment as a charge generating material, a charge transport layer containing a charge transporting material in this order. The charge generating layer ...more ...less
11
JP2018025780A
Publication/Patent Number: JP2018025780A
Publication date: 2018-02-15
Application number: 2017144953
Filing date: 2017-07-26
Assignee: CANON INC
Abstract: PROBLEM TO BE SOLVED: To provide an electrophotographic photoreceptor that is excellent in durability and has sufficient performance of an electrophotographic photoreceptor.SOLUTION: An electrophotographic photoreceptor includes a substrate, a charge generating layer containing a charge generating material, and a charge transport layer containing a charge transport material in this order, and the charge transport layer is a surface layer. The charge transport layer contains a polycarbonate resin having a specific structural unit.SELECTED DRAWING: None PROBLEM TO BE SOLVED: To provide an electrophotographic photoreceptor that is excellent in durability and has sufficient performance of an electrophotographic photoreceptor.SOLUTION: An electrophotographic photoreceptor includes a substrate, a charge generating layer containing ...more ...less
12
DE102017117241A1
Publication/Patent Number: DE102017117241A1
Publication date: 2018-02-01
Application number: 102017117241
Filing date: 2017-07-31
Abstract: Ein elektrophotographisches photosensitives Element beinhaltet einen Träger
13
JP2018036630A
Publication/Patent Number: JP2018036630A
Publication date: 2018-03-08
Application number: 2017158076
Filing date: 2017-08-18
Assignee: CANON INC
Abstract: PROBLEM TO BE SOLVED: To provide an electrophotographic photoreceptor which suppresses fluctuation in potential even when a protective layer formed of a cured product of a composition having a polymerizable functional group is used.SOLUTION: An electrophotographic photoreceptor has a support, a charge generating layer, a charge transport layer containing a charge transport substance and a protective layer in this order, where the charge transport layer contains a polycarbonate resin having a structure selected from group A and a structure selected from group B, and the protective layer is formed of a cured product of a composition containing a compound having at least one polymerizable functional group selected from a chain polymerizable functional group and a sequential polymerizable functional group.SELECTED DRAWING: None PROBLEM TO BE SOLVED: To provide an electrophotographic photoreceptor which suppresses fluctuation in potential even when a protective layer formed of a cured product of a composition having a polymerizable functional group is used.SOLUTION: An electrophotographic photoreceptor ...more ...less
14
US9921499B2
Publication/Patent Number: US9921499B2
Publication date: 2018-03-20
Application number: 15/334,884
Filing date: 2016-10-26
Abstract: An electrophotographic photosensitive member includes a substrate and a photosensitive layer containing a phthalocyanine pigment. The crystalline particles of the phthalocyanine pigment have a crystallite correlation length r and a particle size R of 400 nm or less, and a parameter k defined by r/R is in the range of 0.17 to 0.42. An electrophotographic photosensitive member includes a substrate and a photosensitive layer containing a phthalocyanine pigment. The crystalline particles of the phthalocyanine pigment have a crystallite correlation length r and a particle size R of 400 nm or less, and a ...more ...less
15
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
16
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
17
JP2017083585A
Publication/Patent Number: JP2017083585A
Publication date: 2017-05-18
Application number: 2015210100
Filing date: 2015-10-26
Assignee: CANON INC
Abstract: PROBLEM TO BE SOLVED: To provide an electrophotographic photoreceptor which can output an image having less image defects caused by a ghost phenomenon even in not only normal temperature and normal humidity environment but also low temperature and low humidity environment that is a particularly severe condition PROBLEM TO BE SOLVED: To provide an electrophotographic photoreceptor which can output an image having less image defects caused by a ghost phenomenon even in not only normal temperature and normal humidity environment but also low temperature and low humidity environment that ...more ...less
18
US2017123330A1
Publication/Patent Number: US2017123330A1
Publication date: 2017-05-04
Application number: 15/334,884
Filing date: 2016-10-26
Abstract: An electrophotographic photosensitive member includes a substrate and a photosensitive layer containing a phthalocyanine pigment. The crystalline particles of the phthalocyanine pigment have a crystallite correlation length r and a particle size R of 400 nm or less, and a parameter k defined by r/R is in the range of 0.17 to 0.42. An electrophotographic photosensitive member includes a substrate and a photosensitive layer containing a phthalocyanine pigment. The crystalline particles of the phthalocyanine pigment have a crystallite correlation length r and a particle size R of 400 nm or less, and a ...more ...less
19
JP2017083842A
Publication/Patent Number: JP2017083842A
Publication date: 2017-05-18
Application number: 2016211018
Filing date: 2016-10-27
Assignee: CANON INC
Abstract: PROBLEM TO BE SOLVED: To provide an electrophotographic photoreceptor capable of achieving high level suppression effect of ghost phenomenon while maintaining chargeability required as the electrophotographic photoreceptor.SOLUTION: The electrophotographic photoreceptor has: a support medium; and a photosensitive layer containing a phthalocyanine pigment. In the phthalocyanine pigment PROBLEM TO BE SOLVED: To provide an electrophotographic photoreceptor capable of achieving high level suppression effect of ghost phenomenon while maintaining chargeability required as the electrophotographic photoreceptor.SOLUTION: The electrophotographic photoreceptor has: a ...more ...less
20
US9753385B2
Publication/Patent Number: US9753385B2
Publication date: 2017-09-05
Application number: 15/054,017
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 (groups A and B defined in the disclosure). 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