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US 4,287,282 AGranted
Composite magnetic developer
AssigneeMita Industrial Co., Ltd.
InventorsNobuhiro Miyakawa, Takashi Teshima
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AssigneeMita Industrial Co., Ltd.
InventorsNobuhiro Miyakawa, Takashi Teshima
Estimating the term…
Disclosed is a composite magnetic developer which consists essentially of a homogeneous intimate mixture comprising a plurality of electrically insulating magnetic particulate developers comprising a binder medium and a finely divided magnetic material dispersed in the binder medium, in which the difference of the dielectric constant between the developers is in the range of from 0.2 to 0.85. This composite magnetic developer can provide a clear transferred image having a high density on a transfer sheet such as plain paper, and even if the copying operation is conducted continuously for a long time by using this developer, excellent transferred images can be obtained without substantial change of the composition of the composite developer or substantial reduction of the image density.
A composite magnetic developer which consists essentially of a homogeneous intimate mixture comprising a plurality of electrically insulating magnetic particulate developers, each developer comprising a binder medium and a finely divided magnetic material dispersed in the binder medium, wherein the difference of the dielectric constant (.epsilon.), as measured under conditions of an electrode spacing of 0.65 mm, an electrode sectional area of 1.43 cm.sup.2 and an inter-electrode load of 105 g/cm.sup.2, between said developers is in the range of from 0.2 to 0.85.
Dependencies are inferred from the claim text.