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AssigneeMita Industrial Co., Ltd.
InventorsAkihiro Watanabe, Katsumi Oyama, Yoshihisa Kuramae, Mitsushi Kuroki, Noriaki Tsubota
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Disclosed are a two-component type developer for use in the electrophotography or electrostatic printing, which comprises a magnetic carrier and a toner, and a process for the preparation thereof. This developer has a dynamic resistivity (Rd) lower than the dynamic resistivity (Rc) of the magnetic carrier. This developer is prepared by mixing a toner with a magnetic carrier so that the dynamic resistivity (Rd) of the formed developer is lower than the dynamic resistivity (Rc) of the magnetic carrier. This developer is capable of realizing an excellent reproducibility of a fine line image and a high density of a solid image area simultaneously.
A two-component type developer, which comprises a magnetic carrier and an electroscopic toner, wherein the magnetic carrier is a carrier having a dynamic resistivity (Rc) of 5.times.10.sup.9 to 5.times.10.sup.11 .OMEGA.-cm, and the toner is a toner having a static electroconductivity of 6.times.10.sup.-10 to 4.times.10.sup.-9 s/cm and a dielectric constant (.epsilon.) of 2.7 to 3.9 and the ratio ((Rd/Rc) of the dynamic resistivity (Rd) of the developer to the dynamic resistivity (Rc) of the magnetic carrier is in the range of from 0.20 to 0.99.
A two-component type developer, which comprises a magnetic carrier and an electroscopic toner, wherein the magnetic carrier is a carrier having a dynamic resistivity (Rc) of 5.times.10.sup.9 to 5.times.10.sup.11 .OMEGA.-cm, and the toner is a toner having a static electroconductivity of 6.times.10.sup.-10 to 4.times.10.sup.-9 s/cm and a dielectric constant (.epsilon.) of 2.7 to 3.9, the developer is a developer having a dynamic resistivity (Rd) of 3.0.times.10.sup.10 to 2.5.times.10.sup.11, and the ratio (Rd/Rc) of the dynamic resistivity (Rd) of the developer to the dynamic resistivity (Rc) of the magnetic carrier is in the range of 0.30 to 0.70.
Dependencies are inferred from the claim text.