Liquid electrophotographic developers

Details Liquid electrophotographic developers Liquid electrophotographic developers

1973-07-05

1977-03-29

Bentley, Stephen C.

Compositions

Electrolytes for electrical devices

96 13, G03G 900

Patent

active

040148564

ABSTRACT:
A liquid toner composition comprising carrier liquid and toner particles for the development of electrostatic charge patterns is described wherein the said liquid comprises (1) a bivalent or trivalent metal salt of an oxyacid derived from phosphorus containing at least one organic residue and (2) one or more members selected from the group consisting of amines, polyurethans and alkylated polymers of a heterocyclic N-vinyl monomer. By means of the materials (1) and (2) the polarity of the toner particles can be controlled to obtain optimum image density and contrast. When carbon blacks are used as toner material it is possible to control the polarity to obtain either positive-working or negative-working toner compositions.

REFERENCES:
patent: 2877133 (1959-03-01), Mayer
patent: 3084043 (1963-05-01), Gundlach
patent: 3301675 (1967-01-01), Fauser et al.
patent: 3383209 (1968-05-01), Cassiers et al.
patent: 3542681 (1970-11-01), Mutaffis

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