Electrophoretic development of electrostatic charge images

Radiation imagery chemistry: process – composition – or product th – Electric or magnetic imagery – e.g. – xerography,... – Electrophoretic imaging – process – composition – or product

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430 34, 430119, 430 38, 118661, G03G 1310

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active

047613572

ABSTRACT:
Electrophoretic process and apparatus for developing an electrostatic charge pattern carried by a dielectric surface by progressively moving that surface through a development station and simultaneously progressively advancing a layer of liquid toner (11) comprised of toner particles dispersed in a carrier liquid, through that station in proximity to said charge-carrying surface, (3), and imposing an electric field bias to cause or promote selective image-wise movement of toner particles through said liquid at said development station and deposition thereof on said charge-carrying surface in a pattern representing said electrostatic charge pattern, wherein said layer of liquid toner contains toner particles in a concentration of from 2 to 25% by weight, and including the step of applying a film of a substantially toner-free non-polar liquid which is miscible with the carrier liquid of said liquid toner and which has a specific conductivity lower than 0.2 nS/m over said liquid toner layer (11) in such manner and at such a rate that each increment of such toner layer arrives at the development station, substantially free from turbulence and covered by the film of substantially toner-free liquid, the thickness of the film being such that at the development station it just makes contact with the chargecarrying surface.

REFERENCES:
patent: 3949116 (1976-04-01), Lawson et al.

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