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US 8,088,541 B2Granted
Polyvinyl acetal resin, electrophotographic photosensitive member, process cartridge, and electrophotographic apparatus
AssigneeCanon Kabushiki Kaisha
InventorsMasato Tanaka, Atsushi Fujii, Yuka Ishiduka, Masataka Kawahara, Masaki Nonaka
Life of this patent
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Abstract
The present invention relates to a polyvinyl acetal resin having a specific repeating structural unit, an electrophotographic photosensitive member using the polyvinyl acetal resin, and a process cartridge and an electrophotographic apparatus each having the electrophotographic photosensitive member.
Claims7
An electrophotographic photosensitive member, comprising:
- a support;
- and
- a photosensitive layer provided on the support,
- wherein the photosensitive layer comprises a charge generation layer comprising a charge generation substance and a charge transport layer comprising a charge transport substance,
- wherein the charge generation layer comprises a polyvinyl acetal resin comprising a repeating structural unit represented by one of the following formulas (1) to (4):
- and wherein the charge generation layer comprises, as the charge generation substance, at least one of:
- a hydroxygallium phthalocyanine crystal having a strong peak at a Bragg angle in CuKα characteristic X-ray diffraction of 7.4°±0.3° and 28.2°±0.3°;
- and
- a mixture of four azo compounds, each represented by a different one of the following structural formulas (CGM-2) to (CGM-5):
6 more elements
Dependencies are inferred from the claim text.