Multiple copy electrophotographic process using dye sensitized Z

Details Multiple copy electrophotographic process using dye sensitized Z Multiple copy electrophotographic process using dye sensitized Z

1981-11-13

1983-07-05

Martin, Jr., Roland E.

Radiation imagery chemistry: process, composition, or product th

Electric or magnetic imagery, e.g., xerography,...

Post imaging process, finishing, or perfecting composition...

430 31, 430 89, 430 91, 430902, 101DIG13, G03G 1322, G03G 1302

Patent

active

043918921

ABSTRACT:
In an electrostatic photographic process comprising subjecting an electrostatic photographic photosensitive plate to the combination of negative charging, positive charging and imagewise exposure to form an electrostatic latent image of a positive polarity, said electrostatic photographic photosensitive plate having such charging characteristics that a photosensitive layer can be positively charged by sequential negative corona charging and positive corona charging and positive charging is rendered substantially impossible by irradiation with light, and then subjecting the so treated photosensitive plate to positive charging a predetermined number of times, whereby an electrostatic latent image is formed the predetermined number of times by imagewise exposure conducted once, if a zinc oxide-resin dispersion is used for the photosensitive layer of the photosensitive plate and predetermined amounts of a triphenylmethane basic dye and a silicone oil are incorporated in the photosensitive layer, the time required for negative charging can be shortened, and the charge potential at the time of positive charging can be increased and accumulation of the residual potential after irradiation with light can be reduced.

REFERENCES:
patent: 3412242 (1968-11-01), Giaimo
patent: 3519420 (1970-07-01), Goffe
patent: 3918971 (1975-11-01), Zweig
patent: 4063945 (1977-12-01), Von Hoene et al.
patent: 4308334 (1981-12-01), Kinoshita et al.

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