Electrophotographic photosensitive member, process cartridge, and electrophotographic apparatus
First Claim
1. An electrophotographic photosensitive member, comprising:
- a laminated body and a hole transporting layer on the laminated body, the laminated body comprising;
a support;
an undercoat layer having a thickness of d1 (μ
m), on the support; and
a charge generating layer having a thickness of d2 (μ
m), on the undercoat layer, whereinthe hole transporting layer has a thickness of 15 μ
m or less,the undercoat layer comprises a polymerized product of a composition including an electron transport material represented by formula (1), a cross-linking agent, and a thermoplastic resin having a polymerizable functional group;
Z1—
X—
Z2
(1)in which Z1 and Z2 each represent a group having an electron transport property;
X represents a linking group, and the linking group is a substituted or unsubstituted alkylene group, a substituted or unsubstituted arylene group, a substituted or unsubstituted heterocyclic group, or a group derived by substituting one of methylene groups in a main chain of the substituted or unsubstituted alkylene group with R1, the R1 representing an oxygen atom, a sulfur atom, SO2, NR2, CO, or a substituted or unsubstituted arylene group, the R2 representing a hydrogen atom, an alkyl group, or an aryl group; and
at least one of Z1, Z2, and X has a polymerizable functional group, and the polymerizable functional group is a hydroxyl group, a thiol group, an amino group, a carboxyl group, or a methoxy group;
when the charge generating layer of the laminated body is charged by corona charging so that a dark potential of a surface of the charge generating layer after 1.0 second from the corona charging being defined as Vd1, Vd1 satisfies expression (4)
Vd1=−
100×
(d1+d2)
(4), anda dark potential of the surface of the charge generating layer after 0.80 second from the corona charging is defined as Vd2, Vd1 and Vd2 satisfies expression (2)
0.20≦
|Vd2−
Vd1|≦
2.0
(2), andwhen the surface of the charge generating layer which has a potential of Vd1 (V) is exposed to a laser light having a wavelength of 780 nm for 1 microsecond and a light intensity so that the potential of the surface of the charge generating layer decays by 20% with respect to Vd1 (V) after 0.04 second from the exposure to the laser light, and a transit time (ms) determined based on a time change rate of the potential of the surface of the charge generating layer after the exposure to the laser light is defined as τ
, τ
, satisfies expression (3);
τ
≦
10
(3).
1 Assignment
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Accused Products
Abstract
An electrophotographic photosensitive member includes a laminated body, the laminated body including a support, an undercoat layer, and a charge generating layer. The undercoat layer includes a polymerized product of a composition including an electron transport material represented by formula (1), a cross-linking agent, and a thermoplastic resin having a polymerizable functional group, the laminated body satisfying expressions (2) and (3)
Z1—X—Z2 (1)
0.20≦|Vd2−Vd1|≦2.0 (2)
τ≦10 (3)
in which Z1 and Z2 are groups having electron transport property, X is a linker, Vd2 and Vd1 are surface potentials of the charge generating layer after charging and τ is transit time based on a change rate of the surface of the charge generating layer, each as defined in the specification.
-
Citations
24 Claims
-
1. An electrophotographic photosensitive member, comprising:
-
a laminated body and a hole transporting layer on the laminated body, the laminated body comprising; a support; an undercoat layer having a thickness of d1 (μ
m), on the support; anda charge generating layer having a thickness of d2 (μ
m), on the undercoat layer, whereinthe hole transporting layer has a thickness of 15 μ
m or less,the undercoat layer comprises a polymerized product of a composition including an electron transport material represented by formula (1), a cross-linking agent, and a thermoplastic resin having a polymerizable functional group;
Z1—
X—
Z2
(1)in which Z1 and Z2 each represent a group having an electron transport property; X represents a linking group, and the linking group is a substituted or unsubstituted alkylene group, a substituted or unsubstituted arylene group, a substituted or unsubstituted heterocyclic group, or a group derived by substituting one of methylene groups in a main chain of the substituted or unsubstituted alkylene group with R1, the R1 representing an oxygen atom, a sulfur atom, SO2, NR2, CO, or a substituted or unsubstituted arylene group, the R2 representing a hydrogen atom, an alkyl group, or an aryl group; and at least one of Z1, Z2, and X has a polymerizable functional group, and the polymerizable functional group is a hydroxyl group, a thiol group, an amino group, a carboxyl group, or a methoxy group; when the charge generating layer of the laminated body is charged by corona charging so that a dark potential of a surface of the charge generating layer after 1.0 second from the corona charging being defined as Vd1, Vd1 satisfies expression (4)
Vd1=−
100×
(d1+d2)
(4), anda dark potential of the surface of the charge generating layer after 0.80 second from the corona charging is defined as Vd2, Vd1 and Vd2 satisfies expression (2)
0.20≦
|Vd2−
Vd1|≦
2.0
(2), andwhen the surface of the charge generating layer which has a potential of Vd1 (V) is exposed to a laser light having a wavelength of 780 nm for 1 microsecond and a light intensity so that the potential of the surface of the charge generating layer decays by 20% with respect to Vd1 (V) after 0.04 second from the exposure to the laser light, and a transit time (ms) determined based on a time change rate of the potential of the surface of the charge generating layer after the exposure to the laser light is defined as τ
, τ
, satisfies expression (3);
τ
≦
10
(3). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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-
10. An electrophotographic photosensitive member, comprising:
-
a support; an undercoat layer on the support; and a photosensitive layer on the undercoat layer, wherein the undercoat layer comprises a polymerized product of one of the following (i) and (ii); (i) a polymerized product of a compound represented by formula (11); and (ii) a polymerized product of a composition containing the compound represented by formula (11) and a cross-linking agent; - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
-
-
21. A process cartridge, comprising:
-
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, the process cartridge integrally supporting the electrophotographic photosensitive member and the at least one unit, the process cartridge being removably mounted onto an electrophotographic apparatus, wherein the electrophotographic photosensitive member comprises a laminated body and a hole transporting layer on the laminated body, the laminated body comprises; a support; an undercoat layer having a thickness of d1 (μ
m), on the support; anda charge generating layer having a thickness of d2 (μ
m), on the undercoat layer, whereinthe hole transporting layer has a thickness of 15 μ
m or less;the undercoat layer comprises a polymerized product of a composition including an electron transport material represented by formula (1), a cross-linking agent, and a thermoplastic resin having a polymerizable functional group;
Z1—
X—
Z2
(1)in which Z1 and Z2 each represent a group having an electron transport property; X represents a linking group, and the linking group is a substituted or unsubstituted alkylene group, a substituted or unsubstituted arylene group, a substituted or unsubstituted heterocyclic group, or a group derived by substituting one of methylene groups in a main chain of the substituted or unsubstituted alkylene group with R1, the R1 representing an oxygen atom, a sulfur atom, SO2, NR2, CO, or a substituted or unsubstituted arylene group, the R2 representing a hydrogen atom, an alkyl group, or an aryl group; and at least one of Z1, Z2, and X has a polymerizable functional group, and the polymerizable functional group is a hydroxyl group, a thiol group, an amino group, a carboxyl group, or a methoxy group; when the charge generating layer of the laminated body is charged by corona charging so that a dark potential of a surface of the charge generating layer after 1.0 second from the corona charging being defined as Vd1, Vd1 satisfies expression (4)
Vd1=−
100×
(d1+d2)
(4), anda dark potential of the surface of the charge generating layer after 0.80 second from the corona charging is defined as Vd2, Vd1 and Vd2 satisfies expression (2)
0.20≦
|Vd2−
Vd1|≦
2.0
(2), andwhen the surface of the charge generating layer which has a potential of Vd1 (V) is exposed to a laser light having a wavelength of 780 nm for 1 microsecond and a light intensity so that the potential of the surface of the charge generating layer decays by 20% with respect to Vd1 (V) after 0.04 second from the exposure to the laser light, and a transit time (ms) determined based on a time change rate of the potential of the surface of the charge generating layer after the exposure to the laser light is defined as τ
, τ
, satisfies expression (3);
τ
≦
10
(3).
-
-
22. An electrophotographic apparatus, comprising:
-
an electrophotographic photosensitive member; an exposing unit; a charging unit; a developing unit; and a transferring unit, wherein the electrophotographic photosensitive member comprises; a laminated body and a hole transporting layer on the laminated body, the laminated body comprising; a support; an undercoat layer having a thickness of d1 (μ
m), on the support; anda charge generating layer having a thickness of d2 (μ
m), on the undercoat layer, whereinthe hole transporting layer has a thickness of 15 μ
m or less;the undercoat layer comprises a polymerized product of a composition including an electron transport material represented by formula (1), a cross-linking agent, and a thermoplastic resin having a polymerizable functional group;
Z1—
X—
Z2
(1)in which Z1 and Z2 each represent a group having an electron transport property; X represents a linking group, and the linking group is a substituted or unsubstituted alkylene group, a substituted or unsubstituted arylene group, a substituted or unsubstituted heterocyclic group, or a group derived by substituting one of methylene groups in a main chain of the substituted or unsubstituted alkylene group with R1, the R1 representing an oxygen atom, a sulfur atom, SO2, NR2, CO, or a substituted or unsubstituted arylene group, the R2 representing a hydrogen atom, an alkyl group, or an aryl group; and at least one of Z1, Z2, and X has a polymerizable functional group, and the polymerizable functional group is a hydroxyl group, a thiol group, an amino group, a carboxyl group, or a methoxy group; when the charge generating layer of the laminated body is charged by corona charging so that a dark potential of a surface of the charge generating layer after 1.0 second from the corona charging being defined as Vd1, Vd1 satisfies expression (4)
Vd1=−
100×
(d1+d2)
(4), anda dark potential of the surface of the charge generating layer after 0.80 second from the corona charging is defined as Vd2, Vd1 and Vd2 satisfies expression (2)
0.20≦
|Vd2−
Vd1|≦
2.0
(2), andwhen the surface of the charge generating layer which has a potential of Vd1 (V) is exposed to a laser light having a wavelength of 780 nm for 1 microsecond and a light intensity so that the potential of the surface of the charge generating layer decays by 20% with respect to Vd1 (V) after 0.04 second from the exposure to the laser light, and a transit time (ms) determined based on a time change rate of the potential of the surface of the charge generating layer after the exposure to the laser light is defined as τ
, τ
, satisfies expression (3);
τ
≦
10
(3).
-
-
23. A process cartridge, comprising:
-
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, the process cartridge integrally supporting the electrophotographic photosensitive member and the at least one unit, and the process cartridge being removably mounted onto an electrophotographic apparatus, wherein the electrophotographic photosensitive member comprises; a support; an undercoat layer on the support; and a photosensitive layer on the undercoat layer, wherein the undercoat layer comprises a polymerized product of one of the following (i) and (ii); (i) a polymerized product of a compound represented by the following formula (11); and (ii) a polymerized product of a composition containing the compound represented by formula (11) and a cross-linking agent;
-
-
24. An electrophotographic apparatus, comprising:
-
an electrophotographic photosensitive member; an exposing unit; a charging unit; a developing unit; and a transferring unit, wherein the electrophotographic photosensitive member comprises; a support; an undercoat layer on the support; and a photosensitive layer on the undercoat layer, the undercoat layer comprising a polymerized product of one of the following (i) and (ii); (i) a polymerized product of a compound represented by formula (11); and (ii) a polymerized product of a composition containing the compound represented by formula (11) and a cross-linking agent;
-
Specification