Radiation imagery chemistry: process – composition – or product th – Electric or magnetic imagery – e.g. – xerography,... – Post imaging process – finishing – or perfecting composition...
Patent
1986-07-25
1987-05-05
Welsh, J. David
Radiation imagery chemistry: process, composition, or product th
Electric or magnetic imagery, e.g., xerography,...
Post imaging process, finishing, or perfecting composition...
430115, 428407, G03G 912
Patent
active
046632654
ABSTRACT:
A liquid electrophoretic developer composition for developing electrostatic latent images, wherein pigment particles for obtaining improved dispersion stability in association with at least two polymers are dispersed in an electrically insulating non-polar carrier liquid having a volume resistivity of at least 10.sup.9 ohm.cm and a dielectric constant less than 3, characterized in that the composition comprises at least one polymer (hereafter called "polymer A") which forms a coating on the pigment particles and has a poor solubility in said liquid as determined by Test A herein described, and at least one polymer (hereafter called "polymer B") being chemically linked to the pre-coated polymer A, said polymer B having a good solubility in said liquid as determined by Test B herein described.
REFERENCES:
patent: 3427258 (1969-02-01), Trease
patent: 3770637 (1973-11-01), Okuno et al.
patent: 3900412 (1975-08-01), Kosel
patent: 4522908 (1985-06-01), de Winter et al.
De Winter Walter F.
Marien August M.
Uytterhoeven Herman J.
Agfa-Gevaert N.V.
Breiner A. W.
Welsh J. David
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