Electrophotographic photoreceptor, electrophotographic photoreceptor cartridge, and image forming device
As an electrophotographic photoreceptor including a protective layer (an outermost layer), a photosensitive layer and a conductive support, wherein the protective layer (the outermost layer) comprises a polymer obtained by polymerizing a compound having a chain polymerizable functional group, and the photosensitive layer comprises a hole transport material satisfying the following formula (1) and an electron transport material satisfying the following formula (2): 600≤ a (1) 400≤ b (2) in the formula (1), a represents a molecular weight of the hole transport material, and in the formula (2), b represents a molecular weight of the electron transport material.
1 . An electrophotographic photoreceptor comprising:
a conductive support; and
a photosensitive layer and a protective layer disposed on the conductive support, wherein
the protective layer comprises a polymer obtained by polymerizing a compound having a chain polymerizable functional group, and
the photosensitive layer in contact with the protective layer comprises a hole transport material satisfying the following formula (1) and an electron transport material satisfying the following formula (2),
the electron transport material comprises a compound represented by the following formula (6),
the compound represented by the following formula (6) comprises a compound represented by the following formula (7) or (8):
600 ≤a (1)
400 ≤b (2)
in the formula (1), a represents a molecular weight of the hole transport material, and
in the formula (2), b represents a molecular weight of the electron transport material,
in the formula (6), R 61 to R 64 each independently represents a hydrogen atom, an alkyl group having 1 or more and 20 or less carbon atoms which may be substituted, or an alkenyl group having 2 or more and 20 or less carbon atoms which may be substituted, R 61 and R 62 or R 63 and R 64 may be bonded to each other to form a cyclic structure, and X represents an organic residue having a molecular weight of 120 or more and 250 or less;
in the formula (7), R 71 to R 73 each independently represent a hydrogen atom, a halogen atom, or an alkyl group having 1 or more and 6 or less carbon atoms;
in the formula (8), R 81 to R 84 each independently represent a hydrogen atom, a halogen atom, or an alkyl group having 1 or more and 6 or less carbon atoms.
2 . The electrophotographic photoreceptor according to claim 1 , wherein
the photosensitive layer is a single layer comprising a binder resin, a charge generation material, the hole transport material, and the electron transport material.
3 . The electrophotographic photoreceptor according to claim 2 , wherein
the photosensitive layer satisfies the following formula (3),
0.15≤( A/a )+( B/b ) (3)
in the formula (3), A represents a content (part by mass) of the hole transport material with respect to 100 of a binder resin content, a represents the molecular weight of the hole transport material, B represents a content (part by mass) of the electron transport material with respect to 100 of the binder resin content, and b represents the molecular weight of the electron transport material.
4 . The electrophotographic photoreceptor according to claim 2 , wherein
the photosensitive layer satisfies the following formula (4),
0.80≤ A/B≤ 3.00 (4)
in the formula (4), A represents a content (part by mass) of the hole transport material with respect to 100 of a binder resin content, and B represents a content (part by mass) of the electron transport material with respect to 100 of the binder resin content.
5 . The electrophotographic photoreceptor according to claim 2 , wherein
the photosensitive layer satisfies the following formula (5),
1.20≤( B/b )/( A/a )≤1.60 (5)
in the formula (5), A represents a content (part by mass) of the hole transport material with respect to 100 of a binder resin content, a represents the molecular weight of the hole transport material, B represents a content (part by mass) of the electron transport material with respect to 100 of the binder resin content, and b represents the molecular weight of the electron transport material.
6 . The electrophotographic photoreceptor according to claim 1 , wherein
the hole transport material satisfies the following formula (1′),
600 ≤a ≤1200 (1′)
in the formula (1′), a represents the molecular weight of the hole transport material.
7 . The electrophotographic photoreceptor according to claim 1 , wherein
the electron transport material satisfies the following formula (2′),
400 ≤b ≤1000 (2′)
in the formula (2′), b represents the molecular weight of the electron transport material.
8 . The electrophotographic photoreceptor according to claim 1 , wherein
a ratio (a/b) of the molecular weight of the hole transport material a to the molecular weight of the electron transport material b is 1.40 or more and 1.90 or less.
9 . The electrophotographic photoreceptor according to claim 1 , wherein
the electrophotographic photoreceptor is positively charged.
10 . The electrophotographic photoreceptor according to claim 1 , wherein
the protective layer comprises a polymer obtained by radically polymerizing the compound having a chain polymerizable functional group.
11 . The electrophotographic photoreceptor according to claim 1 , wherein
the protective layer comprises metal oxide fine particles.
12 . The electrophotographic photoreceptor according to claim 11 , wherein
the metal oxide fine particles are surface-treated with a surface treatment agent having a polymerizable functional group.
13 . The electrophotographic photoreceptor according to claim 1 , wherein
the compound having a chain polymerizable functional group comprises a urethane acrylate.
14 . An electrophotographic photoreceptor cartridge comprising:
the electrophotographic photoreceptor according to claim 1 .
15 . An image forming device comprising:
the electrophotographic photoreceptor according to claim 1 .
16 . An electrophotographic photoreceptor comprising:
a conductive support;
a photosensitive layer disposed on the conductive support; and
an outermost layer disposed on the photosensitive layer, wherein
the outermost layer comprises a polymer obtained by polymerizing a compound having a chain polymerizable functional group, and
the photosensitive layer in contact with the outermost layer comprises a hole transport material satisfying the following formula (1) and an electron transport material satisfying the following formula (2),
the electron transport material comprises a compound represented by the following formula (6),
the compound represented by the following formula (6) comprises a compound represented by the following formula (7) or (8):
600 ≤a (1)
400 ≤b (2)
in the formula (1), a represents a molecular weight of the hole transport material, and
in the formula (2), b represents a molecular weight of the electron transport material,
in the formula (6), R 61 to R 64 each independently represents a hydrogen atom, an alkyl group having 1 or more and 20 or less carbon atoms which may be substituted, or an alkenyl group having 2 or more and 20 or less carbon atoms which may be substituted, R 61 and R 62 or R 63 and R 64 may be bonded to each other to form a cyclic structure, and X represents an organic residue having a molecular weight of 120 or more and 250 or less;
in the formula (7), R 71 to R 73 each independently represent a hydrogen atom, a halogen atom, or an alkyl group having 1 or more and 6 or less carbon atoms;
in the formula ( 8 ), R 81 to R 84 each independently represent a hydrogen atom, a halogen atom, or an alkyl group having 1 or more and 6 or less carbon atoms.
17 . An electrophotographic photoreceptor comprising:
a conductive support; and
a photosensitive layer and a protective layer disposed on the conductive support, wherein
the protective layer comprises a polymer obtained by polymerizing a compound having a chain polymerizable functional group,
the photosensitive layer in contact with the protective layer comprises a binder resin, a hole transport material, and an electron transport material, and
the photosensitive layer in contact with the protective layer satisfies the following formula (5),
1.20≤( B/b )/( A/a )≤1.60 (5)
in the formula (5), A represents a content (part by mass) of the hole transport material with respect to 100 of the binder resin content, a represents a molecular weight of the hole transport material, B represents a content (part by mass) of the electron transport material with respect to 100 of the binder resin content, and b represents a molecular weight of the electron transport material,
the electron transport material comprises a compound represented by the following formula (6),
the compound represented by the following formula (6) comprises a compound represented by the following formula (7) or (8):
in the formula (6), R 61 to R 64 each independently represents a hydrogen atom, an alkyl group having 1 or more and 20 or less carbon atoms which may be substituted, or an alkenyl group having 2 or more and 20 or less carbon atoms which may be substituted, R 61 and R 62 or R 63 and R 64 may be bonded to each other to form a cyclic structure, and X represents an organic residue having a molecular weight of 120 or more and 250 or less;
in the formula (7), R 71 to R 73 each independently represent a hydrogen atom, a halogen atom, or an alkyl group having 1 or more and 6 or less carbon atoms;
in the formula (8), R 81 to R 84 each independently represent a hydrogen atom, a halogen atom, or an alkyl group having 1 or more and 6 or less carbon atoms.
18 . An electrophotographic photoreceptor comprising:
a conductive support; and
a photosensitive layer and a protective layer disposed on the conductive support, wherein the protective layer comprises a polymer obtained by polymerizing a compound having a chain polymerizable functional group,
the photosensitive layer in contact with the protective layer comprises a hole transport material and an electron transport material, and
a ratio (a/b) of a molecular weight of the hole transport material a to a molecular weight of the electron transport material b is 1.40 or more and 1.90 or less,
the electron transport material comprises a compound represented by the following formula (6),
the compound represented by the following formula (6) comprises a compound represented by the following formula (7) or (8);
in the formula (6), R 61 to R 64 each independently represents a hydrogen atom, an alkyl group having 1 or more and 20 or less carbon atoms which may be substituted, or an alkenyl group having 2 or more and 20 or less carbon atoms which may be substituted, R 61 and R 62 or R 63 and R 64 may be bonded to each other to form a cyclic structure, and X represents an organic residue having a molecular weight of 120 or more and 250 or less;
in the formula (7), R 71 to R 73 each independently represent a hydrogen atom, a halogen atom, or an alkyl group having 1 or more and 6 or less carbon atoms;
in the formula (8), R 81 to R 84 each independently represent a hydrogen atom, a halogen atom, or an alkyl group having 1 or more and 6 or less carbon atoms.