Charging roll for electrophotographic apparatuses
AssigneeSumitomo Riko Company Limited
InventorsYoshihiro Saito, Akitoshi Morita, Takeru Horiuchi
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Abstract
A charging roll for electrophotographic apparatuses includes: a shaft body, an elastic body layer formed on an outer circumferential surface of the shaft body, and a surface layer formed on an outer circumferential surface of the elastic body layer. The elastic body layer contains a non-polar rubber, a polar rubber, and a carbon black, and has a relative permittivity of 7 or more and 29 or less and a resistance value of 6.0×104Ω or more and 5.0×106Ω or less. The surface layer contains a fluororesin and a (meth)acrylic resin, and has a relative permittivity of 10 or more and 22 or less and a resistance value of 1.2×104Ω or more and 8.8×105Ω or less.
Claims16
A charging roll for electrophotographic apparatuses comprising:
- a shaft body, an elastic body layer formed on an outer circumferential surface of the shaft body, and a surface layer formed on an outer circumferential surface of the elastic body layer, wherein
- the elastic body layer contains a non-polar rubber, a polar rubber, and a carbon black, and has a relative permittivity of 7 or more and 29 or less and a resistance value of 6.0×104Ω or more and 5.0×106Ω or less, and
- the surface layer contains a fluororesin and a (meth)acrylic resin, and has a relative permittivity of 10 or more and 22 or less and a resistance value of 1.2×104Ω or more and 8.8×105Ω or less.
Dependencies are inferred from the claim text.