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US 4,788,119 AGranted
Electrophotographic photosensitive member containing a disazo pigment
AssigneeCanon Kabushiki Kaisha
InventorsMasataka Yamashita, Hajime Miyazaki, Takao Takiguchi, Masakazu Matsumoto, Masaaki Hiro, Shozo Ishikawa
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Abstract
The invention provides an electrophotographic photosensitive member having an improved sensitivity and an improved potential stability when repeatedly copied by using a photosensitive layer containing a disazo pigment having a specific molecular structure.
Claims7
An electrophotographic photosensitive member comprising a photosensitive layer on a support, said photosensitive layer containing (a) a disazo pigment represented by the following general formula [I]:
- ##STR125## wherein X represents a necessary residue for forming a polycyclic aromatic ring or a hetero ring which may have a substituent by condensation with a benzene ring;
- Y represents an electron attractive group;
- A represents --O--, --S--, or ##STR126## where R.sub.4 represents a hydrogen atom, alkyl, aralkyl or aryl which may have a substituent;
- R.sub.1, R.sub.2 and R.sub.3 each represent a hydrogen atom, a halogen atom, alkyl or alkoxy group which may have a substituent;
- and n is 0 or 1, and (b) optionally, a binder resin.
2 more elements
Dependencies are inferred from the claim text.