Developer for latent electrostatic image and process for prepara

Details Developer for latent electrostatic image and process for prepara Developer for latent electrostatic image and process for prepara

1978-01-06

1979-08-14

Martin, Jr., Roland E.

Compositions

Electrolytes for electrical devices

96 1SD, G03G 908

Patent

active

041644760

ABSTRACT:
The present invention is for the improvements of a developer for a one-component latent electrostatic image and the process for the preparation thereof. The present invention is the one which has improved points at issue in the case of using a developer for the conventional conductive one-component latent electrostatic image for a copying machine using a corona discharger and in which particles are prepared by uniformly mixing a magnetic substance in resin and the magnetic substance is substantially exposed on the particle surface by heat treatment and hydrophobic silica fine powders are supported on, or interposed in, said particles; the particles are, as a whole, electrically insulating and given electric charge necessary to form an image by friction of mutual particles; thus even in a copying machine using a corona discharger, good development can be obtained with this developer; and further the present invention is the one which provides a process for the preparation of said particles.

REFERENCES:
patent: 3196032 (1965-07-01), Seymour
patent: 3627682 (1971-12-01), Hall et al.
patent: 3645770 (1972-02-01), Flint
patent: 3674736 (1972-07-01), Lerman et al.
patent: 3819367 (1974-06-01), Chatterji et al.
patent: 3900588 (1975-08-01), Fisher
patent: 4031021 (1977-06-01), Deming

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