Electrophotographic photosensitive member, process cartridge and electrophotographic apparatus
First Claim
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1. A process cartridge detachably mountable to an electrophotographic apparatus main body, comprising:
- an electrophotographic photosensitive member and contact charging means, wherein said electrophotographic photosensitive member comprises a support and a photosensitive layer disposed on the support, and said electrophotographic photosensitive member has a surface layer comprising a polyester resin having a recurring unit represented by the following formula (1);
wherein A1 represents a substituted or unsubstituted divalent aliphatic hydrocarbon group.
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Abstract
An electrophotographic photosensitive member is constituted by a support and a photosensitive layer disposed on the support. The electrophotographic photosensitive member has a surface layer comprising a polyester resin having a recurring unit represented by the following formula (1):
wherein A1 represents a substituted or unsubstituted divalent aliphatic hydrocarbon group. The resultant surface layer is effective in improving an abrasive resistance of the photosensitive member.
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Citations
12 Claims
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1. A process cartridge detachably mountable to an electrophotographic apparatus main body, comprising:
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an electrophotographic photosensitive member and contact charging means, wherein said electrophotographic photosensitive member comprises a support and a photosensitive layer disposed on the support, and said electrophotographic photosensitive member has a surface layer comprising a polyester resin having a recurring unit represented by the following formula (1);
wherein A1 represents a substituted or unsubstituted divalent aliphatic hydrocarbon group. - View Dependent Claims (3, 4, 5, 6, 7)
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5. A process cartridge according to claim 4, wherein said recurring unit of a polyester resin is represented by the following formula (3):
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wherein R3, R4 and Rn are each hydrogen, halogen or an alkyl group; and
n is 1, 2 or 3.
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6. A process cartridge according to claim 4, wherein said polyester resin comprises a copolymer having a recurring unit represented by the following formula (4) and a recurring unit represented by the following formula (5):
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wherein R5 and R6 are each a substituted or unsubstituted alkylene group and A3 is a substituted or unsubstituted divalent cyclic hydrocarbon group; and
wherein R7 is a substituted or unsubstituted divalent chain aliphatic hydrocarbon group.
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7. A process cartridge according to claim 6, wherein said polyester resin comprises a copolymer having a recurring unit represented by the following formula (3) and a recurring unit represented by the following formula (6):
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wherein R3, R4 and Rn are each hydrogen, halogen or an alkyl group; and
n is 1, 2 or 3, andwherein m is an integer of 2-6.
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2. An electrophotographic apparatus comprising:
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an electrophotographic photosensitive member, contact charging means, exposure means, developing means and transfer means, wherein said electrophotographic photosensitive member comprises a support and a photosensitive layer disposed on the support, and said electrophotographic photosensitive member has a surface layer comprising a polyester resin having a recurring unit represented by the following formula (1);
wherein A1 represents a substituted or unsubstituted divalent aliphatic hydrocarbon group. - View Dependent Claims (8, 9, 10, 11, 12)
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10. An electrophotographic apparatus according to claim 9, wherein said recurring unit of a polyester resin is represented by the following formula (3):
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wherein R3, R4 and Rn are each hydrogen, halogen or an alkyl group; and
n is 1, 2 or 3.
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11. An electrophotographic apparatus according to claim 9, wherein said polyester resin comprises a copolymer having a recurring unit represented by the following formula (4) and a recurring unit represented by the following formula (5):
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wherein R5 and R6 are each a substituted or unsubstituted alkylene group and A3 is a substituted or unsubstituted divalent alicyclic hydrocarbon group; and
wherein R7 is a substituted or unsubstituted divalent chain aliphatic hydrocarbon group.
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12. An electrophotographic apparatus according to claim 11, wherein said polyester resin comprises a copolymer having a recurring unit represented by the following formula (3) and a recurring unit represented by the following formula (6):
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wherein R3, R4 and Rn are each hydrogen, halogen or an alkyl group; and
n is 1, 2 or 3, andwherein m is an integer of 2-6.
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Specification