US 10,416,581 B2Granted

Electrophotographic photosensitive member, process cartridge, and electrophotographic apparatus

AssigneeCanon Kabushiki Kaisha

InventorsYota Ito, Tsutomu Nishida, Shoma Hinata, Tatsuya Yamaai, Akira Sakakibara, Daisuke Miura

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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.

Claims14

Dependent claims

An electrophotographic photosensitive member comprising, in this order:

a support;
a charge generation layer;
a charge transport layer comprising a charge transporting material, and a polycarbonate resin having a structure selected from group A and a structure selected from group B;
and
a protective layer comprising a cured material of a composition comprising a compound having at least a functional group selected from chain-polymerizable functional groups and sequential polymerizable functional groups, wherein
Group A is represented by formulae (101) and (102)
where R211 to R214 independently represent a hydrogen atom, an alkyl group, an aryl group or an alkoxy group;
R215 represents an alkyl group, an aryl group or an alkoxy group;
R216 and R217 independently represent an alkyl group having one to nine carbon atoms;
and i1 represents an integer of 0 to 3, provided that R215 and (CH2)i1CHR216R217 are not the same;
where R221 to R224 independently represent a hydrogen atom, an alkyl group, an aryl group or an alkoxy group;
R225 and R226 independently represent an alkyl group having one to nine carbon atoms, provided that R225 and R226 are not the same;
and i2 represents an integer of 0 to 3;
Group B is represented by formulae (104) to (106)
where R241 to R244 independently represent a hydrogen atom, an alkyl group, an aryl group or an alkoxy group;
and X represents a single bond, an oxygen atom, a sulfur atom or a sulfonyl group;
where R251 to R254 independently represent a hydrogen atom, an alkyl group, an aryl group or an alkoxy group;
and R256 and R257 independently represent a hydrogen atom, an alkyl group, an aryl group or a halogenated alkyl group;
and
where R261 to R264 independently represent a hydrogen atom, an alkyl group, an aryl group or an alkoxy group;
and W represents a cycloalkylidene group having 5 to 12 carbon atoms.

18 more elements

A method for producing an electrophotographic photosensitive member comprising, in this order:

a support;
a charge generation layer;
a charge transport layer comprising a charge transporting material, and a polycarbonate resin having a structure selected from group A and a structure selected from group B;
and
a protective layer comprising a cured material of a composition comprising a compound having at least a functional group selected from chain-polymerizable functional groups and sequential polymerizable functional groups, wherein
Group A is represented by formulae (101) and (102)
where R211 to R214 independently represent a hydrogen atom, an alkyl group, an aryl group or an alkoxy group;
R215 represents an alkyl group, an aryl group or an alkoxy group;
R216 and R217 independently represent an alkyl group having one to nine carbon atoms;
and i1 represents an integer of 0 to 3, provided that R215 and (CH2)i1CHR216R217 are not the same;
where R221 to R224 independently represent a hydrogen atom, an alkyl group, an aryl group or an alkoxy group;
R225 and R226 independently represent an alkyl group having one to nine carbon atoms, provided that R225 and R226 are not the same;
and i2 represents an integer of 0 to 3;
Group B is represented by formulae (104) to (106)
where R241 to R244 independently represent a hydrogen atom, an alkyl group, an aryl group or an alkoxy group;
and X represents a single bond, an oxygen atom, a sulfur atom or a sulfonyl group;
where R251 to R254 independently represent a hydrogen atom, an alkyl group, an aryl group or an alkoxy group;
and R256 and R257 independently represent a hydrogen atom, an alkyl group, an aryl group or a halogenated alkyl group;
and
where R261 to R264 independently represent a hydrogen atom, an alkyl group, an aryl group or an alkoxy group;
and W represents a cycloalkylidene group having 5 to 12 carbon atoms,
the method comprises the steps of forming a coating film of a coating solution comprising the composition, followed by selectively irradiating the coating film with an ultraviolet ray or radiation to form said protective layer.

19 more elements

A process cartridge integrally supporting an electrophotographic photosensitive member and at least one unit selected from the group consisting of a charging unit, a developing unit, a transferring unit and a cleaning unit and being attachable to and detachable from a main body of an electrophotographic apparatus,

the electrophotographic photosensitive member comprising in this order a support;
a charge generation layer;
a charge transport layer comprising a charge transporting material, and a polycarbonate resin having a structure selected from group A and a structure selected from group B;
and
a protective layer comprising a cured material of a composition comprising a compound having at least a functional group selected from chain-polymerizable functional groups and sequential polymerizable functional groups, wherein
Group A is represented by formulae (101) and (102)
where R211 to R214 independently represent a hydrogen atom, an alkyl group, an aryl group or an alkoxy group;
R215 represents an alkyl group, an aryl group or an alkoxy group;
R216 and R217 independently represent an alkyl group having one to nine carbon atoms;
and i1 represents an integer of 0 to 3, provided that R215 and (CH2)i1CHR216R217 are not the same;
where R221 to R224 independently represent a hydrogen atom, an alkyl group, an aryl group, or an alkoxy group;
R225 and R226 independently represent an alkyl group having one to nine carbon atoms, provided that R225 and R226 are not the same;
and i2 represents an integer of 0 to 3;
Group B is represented by formulae (104) to (106)
where R241 to R244 independently represent a hydrogen atom, an alkyl group, an aryl group or an alkoxy group;
and X represents a single bond, an oxygen atom, a sulfur atom or a sulfonyl group;
where R251 to R254 independently represent a hydrogen atom, an alkyl group, an aryl group or an alkoxy group;
and R256 and R257 independently represent a hydrogen atom, an alkyl group, an aryl group or a halogenated alkyl group;
and
where R261 to R264 independently represent a hydrogen atom, an alkyl group, an aryl group or an alkoxy group;
and W represents a cycloalkylidene group having 5 to 12 carbon atoms.

18 more elements

An electrophotographic apparatus comprising an electrophotographic photosensitive member, a charging unit, an exposing unit, a developing unit and a transferring unit, the electrophotographic photosensitive member comprising in this order:

a support;
a charge generation layer;
a charge transport layer comprising a charge transporting material, and a polycarbonate resin having a structure selected from group A and a structure selected from group B;
and
a protective layer comprising a cured material of a composition comprising a compound having at least a functional group selected from chain-polymerizable functional groups and sequential polymerizable functional groups, wherein
Group A is represented by formulae (101) and (102)
where R211 to R214 independently represent a hydrogen atom, an alkyl group, an aryl group or an alkoxy group;
R215 represents an alkyl group, an aryl group or an alkoxy group;
R216 and R217 independently represent an alkyl group having one to nine carbon atoms;
and i1 represents an integer of 0 to 3, provided that R215 and (CH2)i1CHR216R217 are not the same;
where R221 to R224 independently represent a hydrogen atom, an alkyl group, an aryl group or an alkoxy group;
R225 and R226 independently represent an alkyl group having one to nine carbon atoms, provided that R225 and R226 are not the same;
and i2 represents an integer of 0 to 3;
Group B is represented by formulae (104) to (106)
where R241 to R244 independently represent a hydrogen atom, an alkyl group, an aryl group or an alkoxy group;
and X represents a single bond, an oxygen atom, a sulfur atom or a sulfonyl group;
where R251 to R254 independently represent a hydrogen atom, an alkyl group, an aryl group or an alkoxy group;
and R256 and R257 independently represent a hydrogen atom, an alkyl group, an aryl group or a halogenated alkyl group;
and
where R261 to R264 independently represent a hydrogen atom, an alkyl group, an aryl group or an alkoxy group;
and W represents a cycloalkylidene group having 5 to 12 carbon atoms.

18 more elements

Dependencies are inferred from the claim text.

Facts

Application: 15/667,715Filed 3 Aug 2017
Priority: JP 2016-16585126 Aug 2016
Published: US 2018/0059558 A11 Mar 2018
Granted: 17 Sep 2019
Term ends: Not estimatedThe source records don’t support an estimate.

Classification19 codes

G03G 5/14773
Obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds: polycondensates comprising silicon atoms in the main chain
G03G 5/0539
Obtained by reactions only involving carbon-to-carbon unsatured bonds: halogenated polymers
G03G 5/0564
Obtained otherwise than by reactions only involving carbon-to-carbon unsatured bonds: polycarbonates
G03G 5/0578
Obtained otherwise than by reactions only involving carbon-to-carbon unsatured bonds: polycondensates comprising silicon atoms in the main chain