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US 11,599,034 B2Granted
Electrophotographic photosensitive member, process cartridge and electrophotographic apparatus
AssigneeCanon Kabushiki Kaisha
InventorsRyoichi Tokimitsu, Naoto Kameyama, Eileen Takeuchi
Life of this patent
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Abstract
An electrophotographic photosensitive member that has an electroconductive support and a photosensitive layer on the electroconductive support, and reduces image failures. The surface layer of the electrophotographic photosensitive member includes a cured product of a composition of: a charge transporting compound having a specific polymerizable functional group; a polytetrafluoroethylene particle having a specific primary particle diameter; and a polymer having specific structural units and having weight average molecular weight.
Claims7
An electrophotographic photosensitive member comprising an electroconductive support, and a photosensitive layer on the electroconductive support,
- wherein the electrophotographic photosensitive member comprises a surface layer comprising a cured product of a composition of:
- a charge transporting compound having a chain polymerizable functional group selected from the group consisting of chain polymerizable functional groups represented by the following Formulas (1) to (4);
- a polymer having a structural unit represented by the following Formula (5) and a structural unit represented by the following Formula (6), and having a weight average molecular weight of 60,000 or more and 129,000 or less;
- and
- a polytetrafluoroethylene particle,
- wherein a number-average particle diameter of primary particles of the polytetrafluoroethylene particle is 150 nm or larger and 195 nm or smaller,
- an abundance ratio of a polytetrafluoroethylene particle having a primary particle diameter of 150 nm or smaller among the polytetrafluoroethylene particles is 10% by number or more, and
- an abundance ratio of a polytetrafluoroethylene particle having a primary particle diameter of 250 nm or larger is 5% by number or less:
- wherein R51 represents a hydrogen atom or a methyl group, R52 represents an alkylene group, and R53 represents a perfluoroalkyl group having 4 or more and 6 or less carbon atoms;
- wherein R61 represents a hydrogen atom or a methyl group, Y represents a divalent organic group having at least a structure represented by the following Formula (7), and Z represents the following Formula (8);
- wherein Y1 and Y2 each independently represent an alkylene group;
- and
- wherein R81 represents a hydrogen atom or a methyl group, and R82 represents an alkyl group.
10 more elements
An electrophotographic apparatus comprising:
- an electrophotographic photosensitive member;
- and a charging unit, an exposure unit, a developing unit and a transfer unit,
- wherein the electrophotographic photosensitive member comprises an electroconductive support, and a photosensitive layer on the electroconductive support,
- wherein the electrophotographic photosensitive member comprises a surface layer comprising a cured product of a composition of:
- a charge transporting compound having a chain polymerizable functional group selected from the group consisting of chain polymerizable functional groups represented by the following Formulas (1) to (4);
- a polymer having a structural unit represented by the following Formula (5) and a structural unit represented by the following Formula (6), and having a weight average molecular weight of 60,000 or more and 129,000 or less;
- and
- a polytetrafluoroethylene particle,
- wherein a number-average particle diameter of primary particles of the polytetrafluoroethylene particle is 150 nm or larger and 195 nm or smaller,
- an abundance ratio of a polytetrafluoroethylene particle having a primary particle diameter of 150 nm or smaller among the polytetrafluoroethylene particles is 10% by number or more, and
- an abundance ratio of a polytetrafluoroethylene particle having a primary particle diameter of 250 nm or larger is 5% by number or less:
- wherein R51 represents a hydrogen atom or a methyl group, R52 represents an alkylene group, and R53 represents a perfluoroalkyl group having 4 or more and 6 or less carbon atoms;
- wherein R61 represents a hydrogen atom or a methyl group, Y represents a divalent organic group having at least a structure represented by the following Formula (7), and Z represents the following Formula (8);
- wherein Y1 and Y2 each independently represent an alkylene group;
- and
- wherein R81 represents a hydrogen atom or a methyl group, and R82 represents an alkyl group.
13 more elements
A process cartridge that integrally supports an electrophotographic photosensitive member and at least one unit selected from the group consisting of a charging unit, a developing unit and a cleaning unit, and is detachably attachable to a main body of an electrophotographic apparatus,
- wherein the electrophotographic photosensitive member comprises an electroconductive support, and a photosensitive layer on the electroconductive support,
- wherein the electrophotographic photosensitive member comprises a surface layer comprising a cured product of a composition of:
- a charge transporting compound having a chain polymerizable functional group selected from the group consisting of chain polymerizable functional groups represented by the following Formulas (1) to (4);
- a polymer having a structural unit represented by the following Formula (5) and a structural unit represented by the following Formula (6), and having a weight average molecular weight of 60,000 or more and 129,000 or less;
- and
- a polytetrafluoroethylene particle,
- wherein a number-average particle diameter of primary particles of the polytetrafluoroethylene particle is 150 nm or larger and 195 nm or smaller,
- an abundance ratio of a polytetrafluoroethylene particle having a primary particle diameter of 150 nm or smaller among the polytetrafluoroethylene particles is 10% by number or more, and
- an abundance ratio of a polytetrafluoroethylene particle having a primary particle diameter of 250 nm or larger is 5% by number or less:
- wherein R51 represents a hydrogen atom or a methyl group, R52 represents an alkylene group, and R53 represents a perfluoroalkyl group having 4 or more and 6 or less carbon atoms;
- wherein R61 represents a hydrogen atom or a methyl group, Y represents a divalent organic group having at least a structure represented by the following Formula (7), and Z represents the following Formula (8);
- wherein Y1 and Y2 each independently represent an alkylene group;
- and
- wherein R81 represents a hydrogen atom or a methyl group, and R82 represents an alkyl group.
11 more elements
Dependencies are inferred from the claim text.