Pressure induced development of electrostatic latent images

Details Pressure induced development of electrostatic latent images Pressure induced development of electrostatic latent images

1975-06-09

1979-05-01

Esposito, Michael F.

Gas separation: apparatus

Magnetic separating means

96 14, 427 17, 427 24, G03G 1310

Patent

active

041521510

ABSTRACT:
A method for pressure induced development of electrostatic latent images comprising forming an electrostatic latent image on a support member and subsequently placing the image bearing surface of the member in face contact with a receiving sheet, applying a dispersion to at least one of the contacting surfaces in a first state wherein the flow properties of the dispersion are non-Newtonian and the dispersion consists of a liquid phase and of a solid phase comprising flocculated electroscopic marking particles forming a matrix sufficiently strong to prevent extraction of individual electroscopic marking particles from the matrix by electrostatic attraction, using a pressure roller to apply to the dispersion a shear stress of sufficient magnitude to convert the dispersion to a second state wherein the flow properties of the dispersion become Newtonian and the solid phase is deflocculated in the liquid phase to allow individual electroscopic marking particles to deposit in accordance with the latent image, and separating the support member and the sheet whereby an image deposit is produced on the member and the sheet.

REFERENCES:
patent: 3556784 (1971-01-01), Robinson et al.
patent: 3595772 (1971-07-01), Zucker
patent: 3806355 (1974-04-01), Kaufman
patent: 3949116 (1976-04-01), Lawson et al.
patent: 4115114 (1978-09-01), Quang et al.

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