Radiation imagery chemistry: process – composition – or product th – Electric or magnetic imagery – e.g. – xerography,... – Post imaging process – finishing – or perfecting composition...
Patent
1993-02-10
1994-11-22
Goodrow, John
Radiation imagery chemistry: process, composition, or product th
Electric or magnetic imagery, e.g., xerography,...
Post imaging process, finishing, or perfecting composition...
430108, G03G 9083
Patent
active
053668383
ABSTRACT:
An electrostatic developer comprising a mixture of an electrically conductive magnetic toner and an insulating nonmagnetic toner, which can give excellent, fogging-free images having sufficient image density in a wide range of the electrically conductive magnetic toner/insulating nonmagnetic toner mixing ratio when used with a low-potential developing system. The electrically conductive magnetic toner is a toner which is formed by attaching or fixing a frictionally chargeable substance which is chargeable to have a polarity reverse to the polarity of the insulating nonmagnetic toner, to a surface of a main electrically conductive magnetic toner component containing 30 to 70% by weight of a magnetic powder and which has a volume specific resistance of 1.times.10.sup.3 .OMEGA..cm or less, the insulating nonmagnetic toner being a toner which is chargeable to have the same polarity as the polarity of the main electrically conductive magnetic toner component when the electrostatic developer is transferred to a photoconductive drum and which has a volume specific resistance of 1.times.10.sup.9 .OMEGA..cm or more.
REFERENCES:
patent: 4760007 (1988-07-01), Takasu et al.
patent: 5180650 (1993-01-01), Sacripante et al.
patent: 5202210 (1993-04-01), Matsuoka et al.
patent: 5206106 (1993-04-01), Moriya
Goodrow John
Tomoegaw Paper Co., Ltd.
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