Radiation imagery chemistry: process – composition – or product th – Electric or magnetic imagery – e.g. – xerography,... – Charging simultaneous with imaging
Patent
1995-06-02
1997-06-03
Goodrow, John
Radiation imagery chemistry: process, composition, or product th
Electric or magnetic imagery, e.g., xerography,...
Charging simultaneous with imaging
430120, G03G 1322
Patent
active
056353235
ABSTRACT:
A toner used meets the requirement that the value determined by the equation 6/(d.sub.t .multidot..rho..sub.t .multidot.S), wherein d.sub.t is the volume average particle diameter of the toner, .rho..sub.t is the density of the toner, and Fs is the specific surface area of the toner, is in the range of 0.75 to 0.90, and the amount of electrification as measured by a magnet blow-off method is in the range of 10 to 40 .mu.C/g in terms of absolute value. A carrier used meets the requirement that the magnetic susceptibility is not less than 90 emu/g (at 1 kOe), the specific surface area is not less than 1000 cm.sup.2 /g to 1800 cm.sup.2 /g, the electric resistivity is 10.sup.6 to 10.sup.12 .OMEGA.cm, and the average particle diameter is 20 to 100 .mu.m.
REFERENCES:
patent: 4618241 (1986-10-01), Hays et al.
patent: 5456990 (1995-10-01), Takagi et al.
"Magnet Blow-Off Method for Toner Charge Measurement", Nakajima et al, Fujitsu Scientific & Technical Journal, vol. 17, No. 4, Dec. 1981, pp. 115-127.
Furuse Yasuyuki
Nakamura Yasushige
Sawatari Norio
Takahashi Toru
Takei Fumio
Fujitsu Limited
Goodrow John
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