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No. Publication Number Title Publication/Patent Number Publication/Patent Number Publication Date Publication Date
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1 US10539888B2
Electrophotographic photosensitive member, process cartridge, and electrophotographic apparatus
Publication/Patent Number: US10539888B2 Publication Date: 2020-01-21 Application Number: 16/007,871 Filing Date: 2018-06-13 Inventor: Kaku, Kenichi   Watariguchi, Kaname   Araki, Kazuko   Ishida, Tomohito   Sekiya, Michiyo   Assignee: Canon Kabushiki Kaisha   IPC: G03G5/147 Abstract: An electrophotographic photosensitive member includes an electroconductive support member and a photosensitive layer. The uppermost layer of the electrophotographic photosensitive member defines a surface layer, and the surface layer contains polytetrafluoroethylene particles, a charge transporting material, and polyvinyl acetal. The proportion of the polyvinyl acetal content to the polytetrafluoroethylene particles content in the surface layer is in the range of 0.1% by mass to 15.0% by mass, and the charge transporting material content in the surface layer is 35% by mass or more relative to the total mass of the surface layer. An electrophotographic photosensitive member includes an electroconductive support member and a photosensitive layer. The uppermost layer of the electrophotographic photosensitive member defines a surface layer, and the surface layer contains polytetrafluoroethylene particles, a ...More ...Less
2 US10429753B2
Electrophotographic photoconductor, process cartridge, and electrophotographic apparatus
Publication/Patent Number: US10429753B2 Publication Date: 2019-10-01 Application Number: 15/053,914 Filing Date: 2016-02-25 Inventor: Watariguchi, Kaname   Tanaka, Masato   Kawahara, Masataka   Kuno, Jumpei   Assignee: Canon Kabushiki Kaisha   IPC: G03G5/06 Abstract: An electrophotographic photoconductor comprises a support, an undercoat layer, a charge generation layer, and a hole transport layer in this order. The undercoat layer comprises an electron transport substance, and the charge generation layer comprises a gallium phthalocyanine crystal and an amide compound represented by formula (N1): where R1 represents a methyl group, a propyl group, or a vinyl group. An electrophotographic photoconductor comprises a support, an undercoat layer, a charge generation layer, and a hole transport layer in this order. The undercoat layer comprises an electron transport substance, and the charge generation layer comprises a gallium phthalocyanine ...More ...Less
3 US2019004442A1
ELECTROPHOTOGRAPHIC PHOTOSENSITIVE MEMBER, PROCESS CARTRIDGE, AND ELECTROPHOTOGRAPHIC APPARATUS
Publication/Patent Number: US2019004442A1 Publication Date: 2019-01-03 Application Number: 16/007,871 Filing Date: 2018-06-13 Inventor: Kaku, Kenichi   Watariguchi, Kaname   Araki, Kazuko   Ishida, Tomohito   Sekiya, Michiyo   Assignee: CANON KABUSHIKI KAISHA   IPC: G03G5/047 Abstract: An electrophotographic photosensitive member includes an electroconductive support member and a photosensitive layer. The uppermost layer of the electrophotographic photosensitive member defines a surface layer, and the surface layer contains polytetrafluoroethylene particles, a charge transporting material, and polyvinyl acetal. The proportion of the polyvinyl acetal content to the polytetrafluoroethylene particles content in the surface layer is in the range of 0.1% by mass to 15.0% by mass, and the charge transporting material content in the surface layer is 35% by mass or more relative to the total mass of the surface layer. An electrophotographic photosensitive member includes an electroconductive support member and a photosensitive layer. The uppermost layer of the electrophotographic photosensitive member defines a surface layer, and the surface layer contains polytetrafluoroethylene particles, a ...More ...Less
4 EP3422106A1
ELECTROPHOTOGRAPHIC PHOTOSENSITIVE MEMBER, PROCESS CARTRIDGE, AND ELECTROPHOTOGRAPHIC APPARATUS
Publication/Patent Number: EP3422106A1 Publication Date: 2019-01-02 Application Number: 18176715.3 Filing Date: 2018-06-08 Inventor: Kaku, Kenichi   Watariguchi, Kaname   Araki, Kazuko   Ishida, Tomohito   Sekiya, Michiyo   Assignee: CANON KABUSHIKI KAISHA   IPC: G03G5/147 Abstract: An electrophotographic photosensitive member includes an electroconductive support member and a photosensitive layer. The uppermost layer of the electrophotographic photosensitive member defines a surface layer, and the surface layer contains polytetrafluoroethylene particles, a charge transporting material, and polyvinyl acetal. The proportion of the polyvinyl acetal content to the polytetrafluoroethylene particles content in the surface layer is in the range of 0.1% by mass to 15.0% by mass, and the charge transporting material content in the surface layer is 35% by mass or more relative to the total mass of the surface layer. An electrophotographic photosensitive member includes an electroconductive support member and a photosensitive layer. The uppermost layer of the electrophotographic photosensitive member defines a surface layer, and the surface layer contains polytetrafluoroethylene particles, a ...More ...Less
5 US10401746B2
Electrophotographic photosensitive member, process cartridge, and electrophotographic apparatus
Publication/Patent Number: US10401746B2 Publication Date: 2019-09-03 Application Number: 15/961,756 Filing Date: 2018-04-24 Inventor: Watariguchi, Kaname   Hinata, Shoma   Araki, Kazuko   Nishida, Tsutomu   Kuno, Jumpei   Kawahara, Masataka   Ito, Yuto   Kawata, Isao   Assignee: Canon Kabushiki Kaisha   IPC: G03G5/00 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
6 US2018314170A1
ELECTROPHOTOGRAPHIC PHOTOSENSITIVE MEMBER, PROCESS CARTRIDGE, AND ELECTROPHOTOGRAPHIC APPARATUS
Publication/Patent Number: US2018314170A1 Publication Date: 2018-11-01 Application Number: 15/960,117 Filing Date: 2018-04-23 Inventor: Araki, Kazuko   Watariguchi, Kaname   Kawahara, Masataka   Kuno, Jumpei   Assignee: CANON KABUSHIKI KAISHA   IPC: G03G5/06 Abstract: An electrophotographic photosensitive member includes, in this order, a support, a charge generating layer having a thickness of more than 200 nm and containing a hydroxygallium phthalocyanine pigment or a chlorogallium phthalocyanine pigment as a charge generating material, and a charge transport layer containing a charge transporting material. The charge generating material satisfies a requirement for a specific parameter. An electrophotographic photosensitive member includes, in this order, a support, a charge generating layer having a thickness of more than 200 nm and containing a hydroxygallium phthalocyanine pigment or a chlorogallium phthalocyanine pigment as a charge generating material, and ...More ...Less
7 US9869032B2
Manufacturing method of phthalocyanine crystal by milling crystal transformation for at least 1,000 hours
Publication/Patent Number: US9869032B2 Publication Date: 2018-01-16 Application Number: 15/361,636 Filing Date: 2016-11-28 Inventor: Kawahara, Masataka   Tanaka, Masato   Nishida, Tsutomu   Watariguchi, Kaname   Kuno, Jumpei   Assignee: Canon Kabushiki Kaisha   IPC: C30B29/54 Abstract: The present invention provides: an electrophotographic photosensitive member which reduces image defects due to ghosting not only under a normal temperature and normal humidity environment but also even under a low temperature and low humidity environment; and a novel phthalocyanine crystal. The electrophotographic photosensitive member of the present invention comprises a photosensitive layer which comprises a phthalocyanine crystal in which a N,N-dimethylformamide is contained. The content of the N,N-dimethylformamide is 0.1% by mass or more and 1.5% by mass or less based on the phthalocyanine crystal. The present invention provides: an electrophotographic photosensitive member which reduces image defects due to ghosting not only under a normal temperature and normal humidity environment but also even under a low temperature and low humidity environment; and a novel ...More ...Less
8 US10012915B2
Electrophotographic photosensitive member, process cartridge and electrophotographic apparatus, and chlorogallium phthalocyanine crystal and method for producing the same
Publication/Patent Number: US10012915B2 Publication Date: 2018-07-03 Application Number: 15/638,891 Filing Date: 2017-06-30 Inventor: Hirano, Hidetoshi   Watariguchi, Kaname   Kuno, Jumpei   Kawahara, Masataka   Tanaka, Masato   Nishida, Tsutomu   Assignee: Canon Kabushiki Kaisha   IPC: C30B29/54 Abstract: An electrophotographic photosensitive member includes a support and a photosensitive layer in this order. The photosensitive layer contains a chlorogallium phthalocyanine crystal obtained by mixing a hydroxygallium phthalocyanine crystal and an aqueous hydrochloric acid solution. An electrophotographic photosensitive member includes a support and a photosensitive layer in this order. The photosensitive layer contains a chlorogallium phthalocyanine crystal obtained by mixing a hydroxygallium phthalocyanine crystal and an aqueous hydrochloric acid solution. ...More ...Less
9 US2018314171A1
ELECTROPHOTOGRAPHIC PHOTOSENSITIVE MEMBER, PROCESS CARTRIDGE, AND ELECTROPHOTOGRAPHIC APPARATUS
Publication/Patent Number: US2018314171A1 Publication Date: 2018-11-01 Application Number: 15/961,756 Filing Date: 2018-04-24 Inventor: Watariguchi, Kaname   Hinata, Shoma   Araki, Kazuko   Nishida, Tsutomu   Kuno, Jumpei   Kawahara, Masataka   Ito, Yuto   Kawata, Isao   Assignee: CANON KABUSHIKI KAISHA   IPC: G03G5/06 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
10 US9921499B2
Electrophotographic photosensitive member, process cartridge, electrophotographic apparatus, and phthalocyanine pigment
Publication/Patent Number: US9921499B2 Publication Date: 2018-03-20 Application Number: 15/334,884 Filing Date: 2016-10-26 Inventor: Kawata, Isao   Ito, Yuto   Kawahara, Masataka   Tanaka, Masato   Kumoi, Hirofumi   Kuno, Jumpei   Nishida, Tsutomu   Sakuma, Kazuko   Hinata, Shoma   Watariguchi, Kaname   Assignee: CANON KABUSHIKI KAISHA   IPC: C09B67/00 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
11 US9645515B2
Electrophotographic photosensitive member and manufacturing method thereof, process cartridge and electrophotographic apparatus, and phthalocyanine crystal and manufacturing method thereof
Publication/Patent Number: US9645515B2 Publication Date: 2017-05-09 Application Number: 14/689,341 Filing Date: 2015-04-17 Inventor: Kuno, Junpei   Nishida, Tsutomu   Tanaka, Masato   Kawahara, Masataka   Watariguchi, Kaname   Assignee: CANON KABUSHIKI KAISHA   IPC: G03G5/047 Abstract: An electrophotographic photosensitive member capable of outputting an image with suppressed positive ghosting, and a process cartridge and an electrophotographic apparatus each having the electrophotographic photosensitive member are provided. The electrophotographic photosensitive member has a photosensitive layer including a phthalocyanine crystal in which the compound represented by the formula (1) is contained, wherein the content of the compound represented by the formula (1) is 0.1% by mass or more and 1.7% by mass or less based on the phthalocyanine crystal. An electrophotographic photosensitive member capable of outputting an image with suppressed positive ghosting, and a process cartridge and an electrophotographic apparatus each having the electrophotographic photosensitive member are provided. The electrophotographic ...More ...Less
12 US9709907B2
Electrophotographic photosensitive member, process cartridge and electrophotographic apparatus
Publication/Patent Number: US9709907B2 Publication Date: 2017-07-18 Application Number: 14/736,824 Filing Date: 2015-06-11 Inventor: Watariguchi, Kaname   Tanaka, Masato   Kawahara, Masataka   Kuno, Jumpei   Nishida, Tsutomu   Assignee: Canon Kabushiki Kaisha   IPC: G03G5/06 Abstract: An electrophotographic photosensitive member can provide images in which black spots and fogging are suppressed and density unevenness due to coating unevenness of the charge generation layer is suppressed. The charge generation layer of the electrophotographic photosensitive member contains a gallium phthalocyanine crystal, a nitrogen-containing heterocyclic compound, and an amide compound represented by a formula (1), and a nitrogen atom in a heterocyclic ring of the nitrogen-containing heterocyclic compound has a substituent. An electrophotographic photosensitive member can provide images in which black spots and fogging are suppressed and density unevenness due to coating unevenness of the charge generation layer is suppressed. The charge generation layer of the electrophotographic photosensitive ...More ...Less
13 EP2600198B1
ELECTROPHOTOGRAPHIC PHOTOSENSITIVE MEMBER, METHOD OF PRODUCING PHTHALOCYANINE CRYSTAL, METHOD OF PRODUCING ELECTROPHOTOGRAPHIC PHOTOSENSITIVE MEMBER, PROCESS CARTRIDGE, ELECTROPHOTOGRAPHIC APPARATUS, AND PHTHALOCYANINE CRYSTAL
Publication/Patent Number: EP2600198B1 Publication Date: 2017-03-08 Application Number: 12194742.8 Filing Date: 2012-11-29 Inventor: Kawahara, Masataka   Tanaka, Masato   Watariguchi, Kaname   Murakami, Takeshi   Yoshida, Akira   Assignee: Canon Kabushiki Kaisha   IPC: G03G5/05 Abstract: Provided is an electrophotographic photosensitive member including a support and a photosensitive layer formed on the support, in which the photosensitive layer includes a phthalocyanine crystal containing a compound satisfying the following formulae (A) and (B) in itself: 8.9‰¤´P‰¤10.7 (A) and -3.2‰¤L‰¤-1.5 (B) (in the formula (A), ´P represents a polar term of Hansen Solubility Parameters, and in the formula (B), L represents an energy level (eV) of an LUMO (lowest unoccupied molecular orbital) obtained as a result of structural optimization calculation based on density functional calculation B3LYP/6-31G). Provided is an electrophotographic photosensitive member including a support and a photosensitive layer formed on the support, in which the photosensitive layer includes a phthalocyanine crystal containing a compound satisfying the following formulae (A) and (B) in itself: ...More ...Less
14 US9563139B2
Electrophotographic photosensitive member, process cartridge and electrophotographic apparatus
Publication/Patent Number: US9563139B2 Publication Date: 2017-02-07 Application Number: 14/878,208 Filing Date: 2015-10-08 Inventor: Kawahara, Masataka   Tanaka, Masato   Kuno, Jumpei   Nishida, Tsutomu   Watariguchi, Kaname   Assignee: CANON KABUSHIKI KAISHA   IPC: G03G5/00 Abstract: An electrophotographic photosensitive member wherein a charge generating layer of the electrophotographic photosensitive member includes a gallium phthalocyanine crystal in which an organic compound is contained, wherein the organic compound is at least one compound selected from the group consisting of dimethylsulfoxide, N,N-dimethylformamide, N-methylformamide, N-propylformamide, N-vinylformamide and N-methylpyrrolidone, the content of the organic compound is 0.1% by mass or more and 2.0% by mass or less based on a gallium phthalocyanine in the gallium phthalocyanine crystal, and a charge transporting layer of the electrophotographic photosensitive member includes a polycarbonate resin having structural units represented by formulae (1) and (2). An electrophotographic photosensitive member wherein a charge generating layer of the electrophotographic photosensitive member includes a gallium phthalocyanine crystal in which an organic compound is contained, wherein the organic compound is at least one compound selected ...More ...Less
15 US9535347B2
Electrophotographic photosensitive member, process cartridge and electrophotographic apparatus
Publication/Patent Number: US9535347B2 Publication Date: 2017-01-03 Application Number: 14/468,266 Filing Date: 2014-08-25 Inventor: Watariguchi, Kaname   Murakami, Takeshi   Kawahara, Masataka   Tanaka, Masato   Yoshida, Akira   Assignee: CANON KABUSHIKI KAISHA   IPC: G03G5/14 Abstract: In order to provide an electrophotographic photosensitive member with which a ghost is suppressed even under a low temperature and low humidity environment, and a process cartridge and an electrophotographic apparatus having the electrophotographic photosensitive member, the electrophotographic photosensitive member has a support, an undercoat layer formed on the support, and a photosensitive layer formed on the undercoat layer and comprising a charge generating material and a hole transporting material, wherein the undercoat layer comprises a particular amine compound. In order to provide an electrophotographic photosensitive member with which a ghost is suppressed even under a low temperature and low humidity environment, and a process cartridge and an electrophotographic apparatus having the electrophotographic photosensitive member, the ...More ...Less
16 US9645516B2
Electrophotographic photosensitive member, process cartridge and electrophotographic apparatus
Publication/Patent Number: US9645516B2 Publication Date: 2017-05-09 Application Number: 14/936,545 Filing Date: 2015-11-09 Inventor: Kawahara, Masataka   Tanaka, Masato   Kuno, Jumpei   Nishida, Tsutomu   Watariguchi, Kaname   Assignee: CANON KABUSHIKI KAISHA   IPC: G03G5/06 Abstract: An electrophotographic photosensitive member including a support, and a charge generating layer and a charge transporting layer on the support, wherein the charge generating layer includes a gallium phthalocyanine crystal in which an organic compound is contained, wherein the organic compound is at least one compound selected from the group consisting of dimethylsulfoxide, N,N-dimethylformamide, N-methylformamide, N-propylformamide, N-vinylformamide and N-methylpyrrolidone, the content of the organic compound is 0.1% by mass or more and 1.5% or less based on a gallium phthalocyanine in the gallium phthalocyanine crystal, and the charge transporting layer includes a polyester resin having a structural unit represented by formula (1). A-B  (1). An electrophotographic photosensitive member including a support, and a charge generating layer and a charge transporting layer on the support, wherein the charge generating layer includes a gallium phthalocyanine crystal in which an organic compound is contained, wherein the ...More ...Less
17 US2017073835A1
MANUFACTURING METHOD OF PHTHALOCYANINE CRYSTAL
Publication/Patent Number: US2017073835A1 Publication Date: 2017-03-16 Application Number: 15/361,636 Filing Date: 2016-11-28 Inventor: Kawahara, Masataka   Tanaka, Masato   Kuno, Jumpei   Nishida, Tsutomu   Watariguchi, Kaname   Assignee: CANON KABUSHIKI KAISHA   IPC: C30B1/12 Abstract: The present invention provides: an electrophotographic photosensitive member which reduces image defects due to ghosting not only under a normal temperature and normal humidity environment but also even under a low temperature and low humidity environment; and a novel phthalocyanine crystal. The electrophotographic photosensitive member of the present invention comprises a photosensitive layer which comprises a phthalocyanine crystal in which a N,N-dimethylformamide is contained. The content of the N,N-dimethylformamide is 0.1% by mass or more and 1.5% by mass or less based on the phthalocyanine crystal. The present invention provides: an electrophotographic photosensitive member which reduces image defects due to ghosting not only under a normal temperature and normal humidity environment but also even under a low temperature and low humidity environment; and a novel ...More ...Less
18 DE112014006743T5
ELEKTROPHOTOGRAPHISCHES PHOTOSENSITIVES ELEMENT
Title (English): The claimant states that:
Publication/Patent Number: DE112014006743T5 Publication Date: 2017-05-11 Application Number: 112014006743 Filing Date: 2014-06-13 Inventor: Tanaka, Masato   Nishida, Tsutomu   Kawahara, Masataka   Watariguchi, Kaname   Kuno, Jumpei   Assignee: Canon Kabushiki Kaisha   IPC: G03G5/05 Abstract: Es wird ein elektrophotographisches photosensitives Element bereitgestellt
19 US2017299970A1
ELECTROPHOTOGRAPHIC PHOTOSENSITIVE MEMBER, PROCESS CARTRIDGE AND ELECTROPHOTOGRAPHIC APPARATUS, AND CHLOROGALLIUM PHTHALOCYANINE CRYSTAL AND METHOD FOR PRODUCING THE SAME
Publication/Patent Number: US2017299970A1 Publication Date: 2017-10-19 Application Number: 15/638,891 Filing Date: 2017-06-30 Inventor: Nishida, Tsutomu   Tanaka, Masato   Kawahara, Masataka   Kuno, Jumpei   Watariguchi, Kaname   Hirano, Hidetoshi   Assignee: CANON KABUSHIKI KAISHA   IPC: G03G5/047 Abstract: An electrophotographic photosensitive member includes a support and a photosensitive layer in this order. The photosensitive layer contains a chlorogallium phthalocyanine crystal obtained by mixing a hydroxygallium phthalocyanine crystal and an aqueous hydrochloric acid solution. An electrophotographic photosensitive member includes a support and a photosensitive layer in this order. The photosensitive layer contains a chlorogallium phthalocyanine crystal obtained by mixing a hydroxygallium phthalocyanine crystal and an aqueous hydrochloric acid solution. ...More ...Less
20 US2017123330A1
ELECTROPHOTOGRAPHIC PHOTOSENSITIVE MEMBER, PROCESS CARTRIDGE,ELECTROPHOTOGRAPHIC APPARATUS, AND PHTHALOCYANINE PIGMENT
Publication/Patent Number: US2017123330A1 Publication Date: 2017-05-04 Application Number: 15/334,884 Filing Date: 2016-10-26 Inventor: Watariguchi, Kaname   Hinata, Shoma   Sakuma, Kazuko   Nishida, Tsutomu   Kuno, Jumpei   Kumoi, Hirofumi   Tanaka, Masato   Kawahara, Masataka   Ito, Yuto   Kawata, Isao   Assignee: CANON KABUSHIKI KAISHA   IPC: G03G15/00 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