Electrophotographic photosensitive member, process cartridge and electrophotographic apparatus

• US 20050100805A1
• Filed: 08/28/2003
• Published: 05/12/2005
• Est. Priority Date: 08/30/2002
• Status: Active Grant

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Ishiduka, Yuka, Kaku, Kenichi, Ogaki, Harunobu, Takaya, Itaru, Tanaka, Takakazu
• Granted Patent: US 6,994,941 B2
• Time in Patent Office: Days
• US Class Current: 430/72
• CPC Class Codes: G03G 5/0605 Carbocyclic compounds
• CPC Class Codes: G03G 5/0607 containing at least one non-six-membered ring
• CPC Class Codes: G03G 5/0609 containing oxygen
• CPC Class Codes: G03G 5/0629 containing one hetero atom
• CPC Class Codes: G03G 5/071 obtained by reactions only involving carbon-to-carbon unsaturated bonds G03G5/078 takes precedence
• CPC Class Codes: G03G 5/075 obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds G03G5/078 takes precedence

Abstract

An electrophotographic photosensitive member is provided having a support and a photosensitive layer provided on the support and containing at least one kind of charge-transporting material which has a specific structure with a molecular weight of from 1,500 to 4,000, and is held in a proportion of from 90% by weight to 100% by weight based on the total weight of the charge-transporting material.

Claims

1. An electrophotographic photosensitive member comprising a conductive support and a photosensitive layer provided on the support, wherein;

said photosensitive layer contains at least one charge-transporting material;

wherein at least one of said charge-transporting material contained in said photosensitive layer is a charge transporting material having a structure represented by the following Formula (1) and having a molecular weight of from 1,500 to 4,000; and

the charge-transporting material having a structure represented by the following Formula (1) and having a molecular weight of from 1,500 to 4,000 is held in a proportion of from 90% by weight to 100% by weight based on the total weight of the charge transporting material contained in said photosensitive layer;

wherein Ar₁₀₁ to Ar₁₀₈ each independently represent a substituted or unsubstituted monovalent aromatic carbocyclic group or a substituted or unsubstituted monovalent aromatic heterocyclic group, and Z₁₁ to Z₁₅ each independently represent a substituted or unsubstituted divalent aromatic carbocyclic group or a substituted or unsubstituted divalent aromatic heterocyclic group, and wherein one of Z₁₁ to Z₁₅ in Formula (1) is a substituted or unsubstituted dibenzothiophenylene, and the balance are each a substituted or unsubstituted biphenylene group.

11. The electrophotographic photosensitive member according to claim 1, wherein said charge-transporting material having the structure represented by Formula (1) and having a molecular weight of from 1,500 to 4,000 is held in a proportion of 100% by weight based on the total weight of the charge-transporting material contained in said photosensitive layer.

16. The electrophotographic photosensitive member according to claim 1, wherein said charge-transporting material having the structure represented by Formula (1) and having a molecular weight of from 1,500 to 4,000 is synthesized by successive synthesis.

2. An electrophotographic photosensitive member comprising a conductive support and a photosensitive layer provided on the support, wherein;

said photosensitive layer contains at least one charge-transporting material;

wherein at least one of said charge-transporting material contained in said photosensitive layer is a charge-transporting material having a structure represented by the following Formula (2) and having a molecular weight of from 1,500 to 4,000; and

the charge-transporting material having a structure represented by the following Formula (2) and having a molecular weight of from 1,500 to 4,000 is held in a proportion of from 90% by weight to 100% by weight based on the total weight of the charge-transporting material contained in said photosensitive layer;

wherein Ar₂₀₁ to Ar₂₀₉ each independently represent a substituted or unsubstituted monovalent aromatic carbocyclic group or a substituted or unsubstituted monovalent aromatic heterocyclic group, and Z₂₁ to Z₂₆ each independently represent a substituted or unsubstituted divalent aromatic carbocyclic group or a substituted or unsubstituted divalent aromatic heterocyclic group, and wherein one of Z₂₁ to Z₂₆ in Formula (2) is a substituted or unsubstituted dibenzofuranylene group or a substituted or unsubstituted dibenzothiophenylene group, and the balance are each a substituted or unsubstituted biphenylene group.

12. The electrophotographic photosensitive member according to claim 2, wherein said charge-transporting material having the structure represented by Formula (2) and having a molecular weight of from 1,500 to 4,000 is held in a proportion of 100% by weight based on the total weight of the charge-transporting material contained in said photosensitive layer.

17. The electrophotographic photosensitive member according to claim 2, wherein said charge-transporting material having the structure represented by Formula (2) and having a molecular weight of from 1,500 to 4,000 is synthesized by successive synthesis.

3. An electrophotographic photosensitive member comprising a conductive support and a photosensitive layer provided on the support, wherein;

said photosensitive layer contains at least one charge-transporting material;

wherein at least one of said charge-transporting material contained in said photosensitive layer is a charge-transporting material having a structure represented by the following Formula (3) and having a molecular weight of from 1,500 to 4,000; and

the charge-transporting material having a structure represented by the following Formula (3) and having a molecular weight of from 1,500 to 4,000 is held in a proportion of from 90% by weight to 100% by weight based on the total weight of the charge-transporting material contained in said photosensitive layer;

wherein Ar₃₀₁ to Ar₃₁₀ each independently represent a substituted or unsubstituted monovalent aromatic carbocyclic group or a substituted or unsubstituted monovalent aromatic heterocyclic group, and Z₃₁ to Z₃₇ each independently represent a substituted or unsubstituted divalent aromatic carbocyclic group or a substituted or unsubstituted divalent aromatic heterocyclic group, and wherein one of Z₃₁ to Z₃₇ in Formula (3) is a substituted or unsubstituted dibenzofuranylene group or a substituted or unsubstituted dibenzothiophenylene group, and the balance are each a substituted or unsubstituted biphenylene group.

13. The electrophotographic photosensitive member according to claim 3, wherein said charge-transporting material having the structure represented by Formula (3) and having a molecular weight of from 1,500 to 4,000 is held in a proportion of 100% by weight based on the total weight of the charge-transporting material contained in said photosensitive layer.

18. The electrophotographic photosensitive member according to claim 3, wherein said charge-transporting material having the structure represented by Formula (3) and having a molecular weight of from 1,500 to 4,000 is synthesized by successive synthesis.

4. An electrophotographic photosensitive member comprising a conductive support and a photosensitive layer provided on the support, wherein;

said photosensitive layer contains at least one charge-transporting material;

wherein at least one of said charge-transporting material contained in said photosensitive layer is a charge-transporting material having a structure represented by the following Formula (4) and having a molecular weight of from 1,500 to 4,000; and

the charge-transporting material having a structure represented by the following Formula (4) and having a molecular weight of from 1,500 to 4,000 is held in a proportion of from 90% by weight to 100% by weight based on the total weight of the charge-transporting material contained in said photosensitive layer;

wherein Ar₄₀₁ to Ar₄₁₁ each independently represent a substituted or unsubstituted monovalent aromatic carbocyclic group or a substituted or unsubstituted monovalent aromatic heterocyclic group, and Z₄₁ to Z₄₈ each independently represent a substituted or unsubstituted divalent aromatic carbocyclic group or a substituted or unsubstituted divalent aromatic heterocyclic group, and wherein one of Z₄₁ to Z₄₈ in Formula (4) is a substituted or unsubstituted dibenzofuranylene group or a substituted or unsubstituted dibenzothiophenylene group, and the balance are each a substituted or unsubstituted biphenylene group.

14. The electrophotographic photosensitive member according to claim 4, wherein said charge-transporting material having the structure represented by Formula (4) and having a molecular weight of from 1,500 to 4,000 is held in a proportion of 100% by weight based on the total weight of the charge-transporting material contained in said photosensitive layer.

19. The electrophotographic photosensitive member according to claim 4, wherein said charge-transporting material having the structure represented by Formula (4) and having a molecular weight of from 1,500 to 4,000 is synthesized by successive synthesis.

5. An electrophotographic photosensitive member comprising a conductive support and a photosensitive layer provided on the support, wherein;

said photosensitive layer contains at least one charge-transporting material;

wherein at least one of said charge-transporting material contained in said photosensitive layer is a charge-transporting material having a structure represented by the following Formula (5) and having a molecular weight of from 1,500 to 4,000; and

the charge-transporting material having a structure represented by the following Formula (5) and having a molecular weight of from 1,500 to 4,000 is held in a proportion of from 90% by weight to 100% by weight based on the total weight of the charge-transporting material contained in said photosensitive layer;

wherein Ar₅₀₁ to Ar₅₁₂ each independently represent a substituted or unsubstituted monovalent aromatic carbocyclic group or a substituted or unsubstituted monovalent aromatic heterocyclic group, and Z₅₁ to Z₅₉ each independently represent a substituted or unsubstituted divalent aromatic carbocyclic group or a substituted or unsubstituted divalent aromatic heterocyclic group, and wherein one of Z₅₁ to Z₅₉ in Formula (5), one is a substituted or unsubstituted dibenzofuranylene group or a substituted or unsubstituted dibenzothiophenylene group, and the balance are each a substituted or unsubstituted biphenylene group.

15. The electrophotographic photosensitive member according to claim 5, wherein said charge-transporting material having the structure represented by Formula (5) and having a molecular weight of from 1,500 to 4,000 is held in a proportion of 100% by weight based on the total weight of the charge-transporting material contained in said photosensitive layer.

20. The electrophotographic photosensitive member according to claim 5, wherein said charge-transporting material having the structure represented by Formula (5) and having a molecular weight of from 1,500 to 4,000 is synthesized by successive synthesis.

6-10. -10. (canceled).

21. A process cartridge comprising an electrophotographic photosensitive member and at least one means selected from the group consisting of a charging means, a developing means and a cleaning means which are integrally supported;

and being detachably mountable on the main body of an electrophotographic apparatus;

the electrophotographic photosensitive member comprising a conductive support and a photosensitive layer provided on the support, wherein;

said photosensitive layer contains at least one charge-transporting material;

wherein at least one of said charge-transporting material contained in said photosensitive layer is a charge-transporting material having a structure represented by the following Formula (1) and having a molecular weight of from 1,500 to 4,000; and

the charge-transporting material having a structure represented by the following Formula (1) and having a molecular weight of from 1,500 to 4,000 is held in a proportion of from 90% by weight to 100% by weight based on the total weight of the charge-transporting material contained in said photosensitive layer;

wherein Ar₁₀₁ to Ar₁₀₈ each independently represent a substituted or unsubstituted monovalent aromatic carbocyclic group or a substituted or unsubstituted monovalent aromatic heterocyclic group, and Z₁₁ to Z₁₅ each independently represent a substituted or unsubstituted divalent aromatic carbocyclic group or a substituted or unsubstituted divalent aromatic heterocyclic group, and wherein one of Z₁₁ to Z₁₅ in Formula (1) is a substituted or unsubstituted dibenzothiophenylene, and the balance are each a substituted or unsubstituted biphenylene group.

22. A process cartridge comprising an electrophotographic photosensitive member and at least one means selected from the group consisting of a charging means, a developing means and a cleaning means which are integrally supported;

and being detachably mountable on the main body of an electrophotographic apparatus;

the electrophotographic photosensitive member comprising a conductive support and a photosensitive layer provided on the support, wherein;

said photosensitive layer contains at least one charge-transporting material;

wherein at least one of said charge-transporting material contained in said photosensitive layer is a charge-transporting material having a structure represented by the following Formula (2) and having a molecular weight of from 1,500 to 4,000; and

the charge-transporting material having a structure represented by the following Formula (2) and having a molecular weight of from 1,500 to 4,000 is held in a proportion of from 90% by weight to 100% by weight based on the total weight of the charge-transporting material contained in said photosensitive layer;

wherein Ar₂₀₁ to Ar₂₀₉ each independently represent a substituted or unsubstituted monovalent aromatic carbocyclic group or a substituted or unsubstituted monovalent aromatic heterocyclic group, and Z₂₁ to Z₂₆ each independently represent a substituted or unsubstituted divalent aromatic carbocyclic group or a substituted or unsubstituted divalent aromatic heterocyclic group, and wherein one of Z₂₁ to Z₂₆ in Formula (2) is a substituted or unsubstituted dibenzofuranylene group or a substituted or unsubstituted dibenzothiophenylene group, and the balance are each a substituted or unsubstituted biphenylene group.

23. A process cartridge comprising an electrophotographic photosensitive member and at least one means selected from the group consisting of a charging means, a developing means and a cleaning means which are integrally supported;

and being detachably mountable on the main body of an electrophotographic apparatus;

the electrophotographic photosensitive member comprising a conductive support and a photosensitive layer provided on the support, wherein;

said photosensitive layer contains at least one charge-transporting material;

wherein at least one of said charge-transporting material contained in said photosensitive layer is a charge-transporting material having a structure represented by the following Formula (3) and having a molecular weight of from 1,500 to 4,000; and

the charge-transporting material having a structure represented by the following Formula (3) and having a molecular weight of from 1,500 to 4,000 is held in a proportion of from 90% by weight to 100% by weight based on the total weight of the charge-transporting material contained in said photosensitive layer;

wherein Ar₃₀₁ to Ar₃₁₀ each independently represent a substituted or unsubstituted monovalent aromatic carbocyclic group or a substituted or unsubstituted monovalent aromatic heterocyclic group, and Z₃₁ to Z₃₇ each independently represent a substituted or unsubstituted divalent aromatic carbocyclic group or a substituted or unsubstituted divalent aromatic heterocyclic group, and wherein one of Z₃₁ to Z₃₇ in Formula (3) is a substituted or unsubstituted dibenzofuranylene group or a substituted or unsubstituted dibenzothiophenylene group, and the balance are each a substituted or unsubstituted biphenylene group.

24. A process cartridge comprising an electrophotographic photosensitive member and at least one means selected from the group consisting of a charging means, a developing means and a cleaning means which are integrally supported;

and being detachably mountable on the main body of an electrophotographic apparatus;

the electrophotographic photosensitive member comprising a conductive support and a photosensitive layer provided on the support, wherein;

said photosensitive layer contains at least one charge-transporting material;

wherein at least one of said charge-transporting material contained in said photosensitive layer is a charge-transporting material having a structure represented by the following Formula (4) and having a molecular weight of from 1,500 to 4,000; and

the charge-transporting material having a structure represented by the following Formula (4) and having a molecular weight of from 1,500 to 4,000 is held in a proportion of from 90% by weight to 100% by weight based on the total weight of the charge-transporting material contained in said photosensitive layer;

wherein Ar₄₀₁ to Ar₄₁₁ each independently represent a substituted or unsubstituted monovalent aromatic carbocyclic group or a substituted or unsubstituted monovalent aromatic heterocyclic group, and Z₄₁ to Z₄₈ each independently represent a substituted or unsubstituted divalent aromatic carbocyclic group or a substituted or unsubstituted divalent aromatic heterocyclic group, and wherein one of Z₄₁ to Z₄₈ in Formula (4) is a substituted or unsubstituted dibenzofuranylene group or a substituted or unsubstituted dibenzothiophenylene group, and the balance are each a substituted or unsubstituted biphenylene group.

25. A process cartridge comprising an electrophotographic photosensitive member and at least one means selected from the group consisting of a charging means, a developing means and a cleaning means which are integrally supported;

and being detachably mountable on the main body of an electrophotographic apparatus;

the electrophotographic photosensitive member comprising a conductive support and a photosensitive layer provided on the support, wherein;

said photosensitive layer contains at least one charge-transporting material;

wherein at least one of said charge-transporting material contained in said photosensitive layer is a charge-transporting material having a structure represented by the following Formula (5) and having a molecular weight of from 1,500 to 4,000; and

the charge-transporting material having a structure represented by the following Formula (5) and having a molecular weight of from 1,500 to 4,000 is held in a proportion of from 90% by weight to 100% by weight based on the total weight of the charge-transporting material contained in said photosensitive layer;

wherein Ar₅₀₁ to Ar₅₁₂ each independently represent a substituted or unsubstituted monovalent aromatic carbocyclic group or a substituted or unsubstituted monovalent aromatic heterocyclic group, and Z₅₁ to Z₅₉ each independently represent a substituted or unsubstituted divalent aromatic carbocyclic group or a substituted or unsubstituted divalent aromatic heterocyclic group, and wherein one of Z₅₁ to Z₅₉ in Formula (5), one is a substituted or unsubstituted dibenzofuranylene group or a substituted or unsubstituted dibenzothiophenylene group, and the balance are each a substituted or unsubstituted biphenylene group.

26. An electrophotographic apparatus comprising an electrophotographic photosensitive member, a charging means, an exposure means, a developing means and a transfer means;

the electrophotographic photosensitive member comprising a conductive support and a photosensitive layer provided on the support, wherein;

said photosensitive layer contains at least one charge-transporting material;

wherein at least one of said charge-transporting material contained in said photosensitive layer is a charge-transporting material having a structure represented by the following Formula (1) and having a molecular weight of from 1,500 to 4,000; and

the charge-transporting material having a structure represented by the following Formula (1) and having a molecular weight of from 1,500 to 4,000 is held in a proportion of from 90% by weight to 100% by weight based on the total weight of the charge-transporting material contained in said photosensitive layer;

wherein Ar₁₀₁ to Ar₁₀₈ each independently represent a substituted or unsubstituted monovalent aromatic carbocyclic group or a substituted or unsubstituted monovalent aromatic heterocyclic group, and Z₁₁ to Z₁₅ each independently represent a substituted or unsubstituted divalent aromatic carbocyclic group or a substituted or unsubstituted divalent aromatic heterocyclic group, and wherein one of Z₁₁ to Z₁₅ in Formula (1) is a substituted or unsubstituted dibenzothiophenylene, and the balance are each a substituted or unsubstituted biphenylene group.

27. An electrophotographic apparatus comprising an electrophotographic photosensitive member, a charging means, an exposure means, a developing means and a transfer means;

the electrophotographic photosensitive member comprising a conductive support and a photosensitive layer provided on the support, wherein;

said photosensitive layer contains at least one charge-transporting material;

wherein at least one of said charge-transporting material contained in said photosensitive layer is a charge-transporting material having a structure represented by the following Formula (2) and having a molecular weight of from 1,500 to 4,000; and

the charge-transporting material having a structure represented by the following Formula (2) and having a molecular weight of from 1,500 to 4,000 is held in a proportion of from 90% by weight to 100% by weight based on the total weight of the charge-transporting material contained in said photosensitive layer;

wherein Ar₂₀₁ to Ar₂₀₉ each independently represent a substituted or unsubstituted monovalent aromatic carbocyclic group or a substituted or unsubstituted monovalent aromatic heterocyclic group, and Z₂₁ to Z₂₆ each independently represent a substituted or unsubstituted divalent aromatic carbocyclic group or a substituted or unsubstituted divalent aromatic heterocyclic group, and wherein one of Z₂₁ to Z₂₆ in Formula (2) is a substituted or unsubstituted dibenzofuranylene group or a substituted or unsubstituted dibenzothiophenylene group, and the balance are each a substituted or unsubstituted biphenylene group.

28. An electrophotographic apparatus comprising an electrophotographic photosensitive member, a charging means, an exposure means, a developing means and a transfer means;

the electrophotographic photosensitive member comprising a conductive support and a photosensitive layer provided on the support, wherein;

said photosensitive layer contains at least one charge-transporting material;

wherein at least one of said charge-transporting material contained in said photosensitive layer is a charge-transporting material having a structure represented by the following Formula (3) and having a molecular weight of from 1,500 to 4,000; and

the charge-transporting material having a structure represented by the following Formula (3) and having a molecular weight of from 1,500 to 4,000 is held in a proportion of from 90% by weight to 100% by weight based on the total weight of the charge-transporting material contained in said photosensitive layer;

wherein Ar₃₀₁ to Ar₃₁₀ each independently represent a substituted or unsubstituted monovalent aromatic carbocyclic group or a substituted or unsubstituted monovalent aromatic heterocyclic group, and Z₃₁ to Z₃₇ each independently represent a substituted or unsubstituted divalent aromatic carbocyclic group or a substituted or unsubstituted divalent aromatic heterocyclic group, and wherein one of Z₃₁ to Z₃₇ in Formula (3) is a substituted or unsubstituted dibenzofuranylene group or a substituted or unsubstituted dibenzothiophenylene group, and the balance are each a substituted or unsubstituted biphenylene group.

29. An electrophotographic apparatus comprising an electrophotographic photosensitive member, a charging means, an exposure means, a developing means and a transfer means;

the electrophotographic photosensitive member comprising a conductive support and a photosensitive layer provided on the support, wherein;

said photosensitive layer contains at least one charge-transporting material;

wherein at least one of said charge-transporting material contained in said photosensitive layer is a charge-transporting material having a structure represented by the following Formula (4) and having a molecular weight of from 1,500 to 4,000; and

the charge-transporting material having a structure represented by the following Formula (4) and having a molecular weight of from 1,500 to 4,000 is held in a proportion of from 90% by weight to 100% by weight based on the total weight of the charge-transporting material contained in said photosensitive layer;

wherein Ar₄₀₁ to Ar₄₁₁ each independently represent a substituted or unsubstituted monovalent aromatic carbocyclic group or a substituted or unsubstituted monovalent aromatic heterocyclic group, and Z₄₁ to Z₄₈ each independently represent a substituted or unsubstituted divalent aromatic carbocyclic group or a substituted or unsubstituted divalent aromatic heterocyclic group, and wherein one of Z₄₁ to Z₄₈ in Formula (4) is a substituted or unsubstituted dibenzofuranylene group or a substituted or unsubstituted dibenzothiophenylene group, and the balance are each a substituted or unsubstituted biphenylene group.

30. An electrophotographic apparatus comprising an electrophotographic photosensitive member, a charging means, an exposure means, a developing means and a transfer means;

the electrophotographic photosensitive member comprising a conductive support and a photosensitive layer provided on the support, wherein;

said photosensitive layer contains at least one charge-transporting material;

wherein at least one of said charge-transporting material contained in said photosensitive layer is a charge-transporting material having a structure represented by the following Formula (5) and having a molecular weight of from 1,500 to 4,000; and

the charge-transporting material having a structure represented by the following Formula (5) and having a molecular weight of from 1,500 to 4,000 is held in a proportion of from 90% by weight to 100% by weight based on the total weight of the charge-transporting material contained in said photosensitive layer;

wherein Ar₅₀₁ to Ar₅₁₂ each independently represent a substituted or unsubstituted monovalent aromatic carbocyclic group or a substituted or unsubstituted monovalent aromatic heterocyclic group, and Z₅₁ to Z₅₉ each independently represent a substituted or unsubstituted divalent aromatic carbocyclic group or a substituted or unsubstituted divalent aromatic heterocyclic group, and wherein one of Z₅₁ to Z₅₉ in Formula (5), one is a substituted or unsubstituted dibenzofuranylene group or a substituted or unsubstituted dibenzothiophenylene group, and the balance are each a substituted or unsubstituted biphenylene group.

31. An electrophotographic photosensitive member comprising a conductive support and a photosensitive layer provided on the support, wherein;

said photosensitive layer contains at least one charge-transporting material;

wherein at least one of said charge-transporting material contained in said photosensitive layer is a charge-transporting material having a structure represented by the following Formula (1) and having a molecular weight of from 1,500 to 4,000; and

the charge-transporting material having a structure represented by the following Formula (1) and having a molecular weight of from 1,500 to 4,000 is held in a proportion of 100% by weight based on the total weight of the charge-transporting material contained in said photosensitive layer;

wherein Ar₁₀₁ to Ar₁₀₈ each independently represent a substituted or unsubstituted monovalent aromatic carbocyclic group or a substituted or unsubstituted monovalent aromatic heterocyclic group, and Z₁₁ to Z₁₅ each independently represent a substituted or unsubstituted divalent aromatic carbocyclic group or a substituted or unsubstituted divalent aromatic heterocyclic group.

32. An electrophotographic photosensitive member comprising a conductive support and a photosensitive layer provided on the support, wherein;

said photosensitive layer contains at least one charge-transporting material;

wherein at least one of said charge-transporting material contained in said photosensitive layer is a charge-transporting material having a structure represented by the following Formula (2) and having a molecular weight of from 1,500 to 4,000; and

the charge-transporting material having a structure represented by the following Formula (2) and having a molecular weight of from 1,500 to 4,000 is held in a proportion of 100% by weight based on the total weight of the charge-transporting material contained in said photosensitive layer;

wherein Ar₂₀₁ to Ar₂₀₉ each independently represent a substituted or unsubstituted monovalent aromatic carbocyclic group or a substituted or unsubstituted monovalent aromatic heterocyclic group, and Z₂₁ to Z₂₆ each independently represent a substituted or unsubstituted divalent aromatic carbocyclic group or a substituted or unsubstituted divalent aromatic heterocyclic group.

33. An electrophotographic photosensitive member comprising a conductive support and a photosensitive layer provided on the support, wherein;

said photosensitive layer contains at least one charge-transporting material;

wherein at least one of said charge-transporting material contained in said photosensitive layer is a charge-transporting material having a structure represented by the following Formula (3) and having a molecular weight of from 1,500 to 4,000; and

the charge-transporting material having a structure represented by the following Formula (3) and having a molecular weight of from 1,500 to 4,000 is held in a proportion of 100% by weight based on the total weight of the charge-transporting material contained in said photosensitive layer;

wherein Ar₃₀₁ to Ar₃₁₀ each independently represent a substituted or unsubstituted monovalent aromatic carbocyclic group or a substituted or unsubstituted monovalent aromatic heterocyclic group, and Z₃₁ to Z₃₇ each independently represent a substituted or unsubstituted divalent aromatic carbocyclic group or a substituted or unsubstituted divalent aromatic heterocyclic group.

34. An electrophotographic photosensitive member comprising a conductive support and a photosensitive layer provided on the support, wherein;

said photosensitive layer contains at least one charge-transporting material;

wherein at least one of said charge-transporting material contained in said photosensitive layer is a charge-transporting material having a structure represented by the following Formula (4) and having a molecular weight of from 1,500 to 4,000; and

the charge-transporting material having a structure represented by the following Formula (4) and having a molecular weight of from 1,500 to 4,000 is held in a proportion of 100% by weight based on the total weight of the charge-transporting material contained in said photosensitive layer;

wherein Ar₄₀₁ to Ar₄₁₁ each independently represent a substituted or unsubstituted monovalent aromatic carbocyclic group or a substituted or unsubstituted monovalent aromatic heterocyclic group, and Z₄₁ to Z₄₈ each independently represent a substituted or unsubstituted divalent aromatic carbocyclic group or a substituted or unsubstituted divalent aromatic heterocyclic group.

35. An electrophotographic photosensitive member comprising a conductive support and a photosensitive layer provided on the support, wherein;

said photosensitive layer contains at least one charge-transporting material;

wherein at least one of said charge-transporting material contained in said photosensitive layer is a charge-transporting material having a structure represented by the following Formula (5) and having a molecular weight of from 1,500 to 4,000; and

the charge-transporting material having a structure represented by the following Formula (5) and having a molecular weight of from 1,500 to 4,000 is held in a proportion of 100% by weight based on the total weight of the charge-transporting material contained in said photosensitive layer;

wherein Ar₅₀₁ to Ar₅₁₂ each independently represent a substituted or unsubstituted monovalent aromatic carbocyclic group or a substituted or unsubstituted monovalent aromatic heterocyclic group, and Z₅₁ to Z₅₉ each independently represent a substituted or unsubstituted divalent aromatic carbocyclic group or a substituted or unsubstituted divalent aromatic heterocyclic group.