Electrophotographic member and electrophotographic apparatus
First Claim
Patent Images
1. An electrophotographic member, comprising:
- a support;
an elastic layer formed on the support; and
a surface layer covering a surface of the elastic layer and containing a urethane resin, and,wherein the urethane resin comprises a reaction product ofa hydroxyl group-terminated prepolymer obtained by reacting the following polyester polyol (1) or the following polyester polyol (2) with a polyisocyanate, andan isocyanate-terminated prepolymer obtained by reacting the following polyester polyol (3) or the following polyester polyol (4) with a polyisocyanate;
whereinpolyester polyol (1) is;
a reaction product ofat least one carboxylic acid selected from the group consisting of adipic acid and suberic acid,an aliphatic triol having 3 or more and 6 or less carbon atoms, andan aliphatic diol having 4 or more and 6 or less carbon atoms;
polyester polyol (2) is;
a reaction product ofε
-caprolactone andan aliphatic triol having 3 or more and 6 or less carbon atoms;
polyester polyol (3) is;
a reaction product ofat least one carboxylic acid selected from the group consisting of adipic acid and suberic acid,an aliphatic triol having 3 or more and 6 or less carbon atoms, andan aliphatic diol having 4 or more and 6 or less carbon atoms;
polyester polyol (4) is;
a reaction product ofε
-caprolactone andan aliphatic triol having 3 or more and 6 or less carbon atoms.
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Abstract
Provided is an electrophotographic member, which hardly changes in performance even when being left to stand for a long time period. The electrophotographic member comprises a support, an elastic layer formed on the support, and a surface layer covering a surface of the elastic layer and containing a urethane resin, and in which the urethane resin comprises a reaction product of: a hydroxyl group-terminated prepolymer obtained by reacting a polyester polyol with a polyisocyanate; and an isocyanate-terminated prepolymer obtained by reacting a polyester polyol with a polyisocyanate.
33 Citations
10 Claims
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1. An electrophotographic member, comprising:
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a support; an elastic layer formed on the support; and a surface layer covering a surface of the elastic layer and containing a urethane resin, and, wherein the urethane resin comprises a reaction product of a hydroxyl group-terminated prepolymer obtained by reacting the following polyester polyol (1) or the following polyester polyol (2) with a polyisocyanate, and an isocyanate-terminated prepolymer obtained by reacting the following polyester polyol (3) or the following polyester polyol (4) with a polyisocyanate;
whereinpolyester polyol (1) is; a reaction product of at least one carboxylic acid selected from the group consisting of adipic acid and suberic acid, an aliphatic triol having 3 or more and 6 or less carbon atoms, and an aliphatic diol having 4 or more and 6 or less carbon atoms; polyester polyol (2) is; a reaction product of ε
-caprolactone andan aliphatic triol having 3 or more and 6 or less carbon atoms; polyester polyol (3) is; a reaction product of at least one carboxylic acid selected from the group consisting of adipic acid and suberic acid, an aliphatic triol having 3 or more and 6 or less carbon atoms, and an aliphatic diol having 4 or more and 6 or less carbon atoms; polyester polyol (4) is; a reaction product of ε
-caprolactone andan aliphatic triol having 3 or more and 6 or less carbon atoms. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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7. The electrophotographic member according to claim 1, wherein the elastic layer contains a silicone rubber.
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8. A developing device, comprising:
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a developing member; and a developer layer thickness regulating member abutting on a surface of the developing member, wherein the developing member comprises the electrophotographic member according to claim 1.
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9. An electrophotographic apparatus, comprising the developing device according to claim 8.
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10. An electrophotographic apparatus, comprising:
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an electrophotographic photosensitive member; and a charging member placed to abut on the electrophotographic photosensitive member, wherein the charging member comprises the electrophotographic member according to claim 1.
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Specification