Electrophotographic photosensitive member containing disazo compound

• US 4,760,003 A
• Filed: 05/21/1986
• Issued: 07/26/1988
• Est. Priority Date: 05/24/1985
• Status: Expired due to Term

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Matsumoto, Masakazu, Takiguchi, Takao, Ishikawa, Shozo, Umehara, Shoji, Yamashita, Masataka, Miyazaki, Hajime
• Primary Examiner(s): Welsh, J. David
• Application Number:
  US06/865,452
• Time in Patent Office: 797 Days
• Field of Search: 430/58, 430/73, 430/74, 430/76, 430/78
• US Class Current: 430/58.25
• CPC Class Codes: C09B 35/24 the tetrazo component being a derivative of a diaryl amine
• CPC Class Codes: G03G 5/0679 Disazo dyes

Abstract

An electrophotographic photosensitive member comprises a photosensitive layer on a substrate, said photosensitive layer comprising a disazo pigment represented by the formula (1).

Claims

1. An electrophotographic photosensitive member comprising a photosensitive layer on a substrate, said photosensitive layer comprising a disazo pigment represented by the formula:

##STR17## wherein R₁, R₁ '"'"', R₂ and R₂ '"'"' represent hydrogen, halogen, nitro, cyano, or alkyl, aralkyl, alkoxy or aryl group which may have a substituent, A represents a coupler residue having a phenolic OH group, and B represents hydrogen or nitroso group, said A being selected from the formulas (2) to (8) shown below;

##STR18## wherein X represents a residue to be fused with a benzene ring to form a polycyclic aromatic ring of anthracene ring, or a heterocyclic ring;

R₃ and R₄ represent hydrogen, alkyl, aralkyl, aryl or heterocyclic ring which may have a substituent, or taken together represent a residue to form a cyclic amino group together with nitrogen atom;

R₅ and R₆ each represent alkyl, aralkyl, aryl which may have a substituent;

Y represents a divalent aromatic hydrocarbon group or forms a divalent heterocyclic group together with nitrogen atom;

Z represents a residue to be fused with a benzene ring to form a polycyclic aromatic ring or heterocyclic ring;

R₇ and R₈ represent hydrogen, aryl or heterocyclic group which may have substituent or a residue which forms a 5- to 6-membered ring together with the center carbon atom, which 5- to 6-membered ring may have a fused aromatic ring;

R₉ and R₁₀ represent hydrogen, alkyl, aralkyl, aryl or heterocyclic group which may have a substituent.

2. An electrophotographic photosensitive member according to claim 1, wherein the above photosensitive member is a function separation type comprising a charge generation layer and a charge transport layer, said charge generation layer containing the disazo pigment represented by the above formula (1).

3. An electrophotographic photosensitive member according to claim 2, wherein the charge transport layer is laminated on the charge generation layer.

4. An electrophotographic photosensitive member according to claim 2, wherein the charge generation layer is laminated on the charge transport layer.

5. An electrophotographic photosensitive member according to claim 2, wherein a charge transportatable compound selected from hydrazones, pyrazolines and fluorenones is contained in the charge transport layer.

6. An electrophotographic photosensitive member according to claim 1, wherein R₃ in the above formula (2) is hydrogen and R₄ is a substituted phenyl represented by the formula:

##STR19## wherein R₁₁ is a substituent selected from halogen, nitro, cyano, and trifluoromethyl group.

7. An electrophotographic photosensitive member according to claim 1, wherein A in the above formula (1) is represented by the formula (9):

##STR20## wherein R₁₂ represents a phenyl group which may have a substituent.

8. An electrophotographic photosensitive member according to claim 1, wherein B in formula (1) is hydrogen.