Charging member having a surface layer formed of moisture-permeable synthetic resin material and charging device including the same
AssigneeBando Chemical Industries, Ltd.
InventorsTakayuki Nagase, Yasuhiko Yoshida, Makoto Hasegawa, Arata Tani
Life of this patent
Estimating the term…
Abstract
A charging member, which causes no damage on the surface of a member to be charged and which has excellent stability against environmental changes, formed of a moisture-permeable synthetic resin material as the surface layer thereof as well as a charging device including the foregoing charging member, the member to be charged, and a power supply for application of voltage to the charging member.
Claims22
A charging member comprising a surface layer formed of moisture-permeable synthetic resin material, said surface layer having a moisture permeability of about 2000 or more and a water-swelling degree of about 5 or less when the thickness of said layer is set at 20 .mu.m.
A charging member comprising a surface layer formed of moisture-permeable synthetic resin material, said resin material containing a moisture-permeable polyurethane resin and about 2 to about 50 parts by weight of iron blue based on 100 parts by weight of the moisture-permeable polyurethane resin.
A charging member comprising a surface layer formed of moisture-permeable polyurethane resin, said polyurethane resin comprised of a polyol and isocyanate, wherein the polyol is a random copolymer of ethylene oxide and tetrahydrofuran, and the molar ratio of the ethylene oxide to the tetrahydrofuran in the random copolymer is in the range of from about 40/60 to about 80/20.
A charging member comprising a surface layer formed of moisture-permeable polyurethane resin, said polyurethane resin comprised of a polymer of a polyol and an isocyanate, wherein the polyol is a ring-opened form of .epsilon.-caprolactone by polyethylene ether glycol, and the ratio by weight of the polyethylene ether glycol to the .epsilon.-caprolactone in the polyol is in the range of from about 1/9 to about 1/1.
A charging member comprising a surface layer formed of moisture-permeable polyurethane resin, said polyurethane resin comprised of a polyol and an isocyanate, wherein the polyol is a polyester polyol produced from a condensed product of succinic acid and diethylene glycol.
A charging member comprising a surface layer formed of moisture-permeable synthetic resin material, said resin material containing a moisture-permeable polyurethane resin and about 2 to about 50 parts by weight of a sparingly water-soluble inorganic salt based on 100 parts by weight of the moisture-permeable polyurethane resin.
A charging member comprising a surface layer formed of moisture-permeable synthetic resin material, said resin material containing a synthetic resin and about 2 to about 50 parts by weight of iron blue based on 100 parts by weight of the synthetic resin.
A charging device comprising:
- (a) a member to be charged;
- (b) a charging member having (b1) a metal supporting member, (b2) an elastic, conductive interposing layer arranged on the periphery of the supporting member and (b3) a surface layer formed on the periphery of the interposing layer, made of moisture-permeable synthetic resin material, and being in contact with the member to be charged, wherein said surface layer has a moisture permeability of 2000 or more, and a water-swelling degree of 5 or less when the thickness of the surface layer is set at 20 .mu.m;
- and
- (c) a power supply for applying a voltage between the member to be charged and the supporting member.
A charging device comprising:
- (a) a member to be charged;
- (b) a charging member having (b1) a metal supporting member, (b2) an elastic, conductive interposing layer having a base end and a free end, the base end being fixed to the supporting member, and (b3) a surface layer formed on the periphery of the interposing layer, made of moisture-permeable synthetic resin material, and being in contact with the member to be charged in the vicinity of the free end of the interposing layer, wherein said surface layer has a moisture permeability of 2000 or more, and a water-swelling degree of 5 or less when the thickness of the surface layer is set at 20 .mu.m;
- and
- (c) a power supply for applying a voltage between the member to be charged and the supporting member.
The charging member comprising:
- (a) a metal supporting member;
- (b) an elastic, conductive interposing layer formed on the either side or both sides of the metal supporting member;
- and
- (c) a surface layer formed on the interposing layer and made of moisture-permeable synthetic resin material, wherein said surface layer has a moisture permeability of 2000 or more, and a water-swelling degree of 5 or less when the thickness of the surface layer is set at 20 .mu.m.
Dependencies are inferred from the claim text.