Dry toner for direct electrostatic printing (DEP)

Details Dry toner for direct electrostatic printing (DEP) Dry toner for direct electrostatic printing (DEP)

1995-11-07

1997-05-27

Goodrow, John

Radiation imagery chemistry: process, composition, or product th

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

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

347 55, G03G 1506, G01D 1506

Patent

active

056331100

ABSTRACT:
A method for direct electrostatic printing (DEP) on an intermediate substrate or on a final substrate is provided, using a device that comprises a back electrode (105), a printhead structure (106) comprising a control electrode in combination with apertures (107), and a toner delivery means (101) presenting a cloud (104) of dry toner particles in the vicinity of said apertures (107), characterised in that
(i) the toner particles have as topological criterium that the ratio of the length of the long axis of the projected microscopic image of said particles to the length of the short axis, is between 1.00 and 1.40 and
(ii) the toner particles after addition of 0.5% by weight of fumed hydrophobic silica having a specific surface area of 260 m.sup.2 /g show a ratio of apparent density (.rho..sub.app) over real density (.rho..sub.real) ##EQU1##

REFERENCES:
patent: 3939087 (1976-02-01), Vijayendran
patent: 5158851 (1992-10-01), Fuller et al.
patent: 5257046 (1993-10-01), Schmidlin
patent: 5328792 (1994-07-01), Shigemori et al.

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