Member for electrophotography, method for producing the same, and image forming apparatus
AssigneeCanon Kabushiki Kaisha
InventorsKazuhiro Yamauchi, Kenichi Yamauchi, Satoru Nishioka, Hiroki Masu, Noriko Suzumura
Life of this patent
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Abstract
A member for electrophotography for use in forming a high quality electrophotographic image for a long period is provided. The member for electrophotography includes a support, an elastic layer on the support, and a surface layer on the elastic layer. The elastic layer includes a quaternary ammonium salt and an epichlorohydrin rubber. The surface layer includes a material having a specific structure. A universal hardness a surface of the surface layer is 1.0 N/mm2 or more and 5.0 N/mm2 or less.
Claims8
A member for electrophotography comprising:
- a support,
- an elastic layer on the support, and
- a surface layer on the elastic layer;
- wherein,
- the elastic layer comprises a quaternary ammonium salt and an epichlorohydrin rubber;
- the surface layer comprises a polymer having:
- any one or both of the structures represented by the following Formulae (1) and (2),
- any one or both of the structures represented by the following Formulae (3) and (4), and
- a structure represented by the following Formula (5);
- and,
- a universal hardness of a surface of the surface layer is 1.0 N/mm2 or more and 5.0 N/mm2 or less:
- wherein l represents an integer of 1 or more.
A method for producing a member for electrophotography comprising a support, an elastic layer on the support, and a surface layer on the elastic layer, a surface of the surface layer having a universal hardness of 1.0 N/mm2 or more and 5.0 N/mm2 or less, the method comprising the steps of:
- forming the elastic layer comprising a quaternary ammonium salt and an epichlorohydrin rubber on a support;
- forming a coat of a coating liquid on the elastic layer, the coating liquid comprising a polyol and an polyisocyanate;
- and
- reacting the polyol and the polyisocyanate in the coat to form the surface layer, wherein
- the polyol contains:
- any one or both of the following a) and b);
- any one or both of the following c) and d);
- and
- the polyisocyanate contains a following e):
- a):
- any one or both of a compound having a structure represented by Formula (6) and a prepolymer derived from the compound having a structure represented by Formula (6);
- b):
- any one or both of a compound having a structure represented by Formula (7) and a prepolymer derived from the compound having a structure represented by Formula (7);
- c):
- any one or both of a compound represented by Formula (8) and a prepolymer derived from the compound represented by Formula (8);
- d):
- any one or both of a compound represented by Formula (9) and a prepolymer derived from the compound represented by Formula (9);
- and
- e):
- any one or both of a compound represented by Formula (10) and a prepolymer derived from the compound represented by Formula (10):
- in the Formulae (8) to (9), R5 to R8 each independently represent a divalent organic group;
- and M11 and M12 each independently represent an integer of 1 or more;
- and in the Formulae (10), L represents an integer of 1 or more.
An image forming apparatus comprising:
- an electrophotographic photosensitive member;
- a charging apparatus for charging the electrophotographic photosensitive member;
- a developing apparatus for developing an electrostatic latent image formed on the electrophotographic photosensitive member with a developer;
- and
- a transfer member for transferring the developer supported on the electrophotographic photosensitive member to a transfer medium;
- wherein,
- the charging apparatus comprises a charging member having a support, an elastic layer on the support, and a surface layer on the elastic layer;
- the elastic layer comprises a quaternary ammonium salt and an epichlorohydrin rubber;
- the surface layer comprises a polymer having:
- any one or both of the structures represented by the following Formulae (1) and (2),
- any one or both of the structures represented by the following Formulae (3) and (4), and
- a structure represented by the following Formula (5);
- and,
- a universal hardness of a surface of the surface layer is 1.0 N/mm2 or more and 5.0 N/mm2 or less:
- wherein l represents an integer of 1 or more.
Dependencies are inferred from the claim text.