Liquid developer for electrostatic photography

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

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430 49, 430114, G03G 9135

Patent

active

051418355

ABSTRACT:
A liquid developer for electrostatic photography is disclosed. The liquid developer comprises at least resin grains dispersed in a non-aqueous solvent having an electric resistance of at least 10.sup.9 cm and a dielectric constant of not higher than 3.5, wherein the dispersed resin grains are copolymer resin grains obtained by polymerizing a solution containing (1) at least a mono-functional monomer (A) which is soluble in the above-described non-aqueous solvent but becomes insoluble therein by being polymerized, and, optionally, a monomer (C) represented by the formula (III) or a monomer (D) represented by the formula (IV), in the presence of a dispersion-stabilizing resin soluble in the non-aqueous solvent, which is a graft type copolymer. The liquid developer of the present invention is excellent in re-dispersibility, storability, stability, image-reproducibility, and fixability, and provide a master plate for offset printing having high printing durability.

REFERENCES:
patent: 4983486 (1991-01-01), Kato et al.
patent: 5035972 (1991-07-01), El-Sayed et al.
patent: 5041352 (1991-08-01), Kato et al.
patent: 5049468 (1991-09-01), Kato et al.
patent: 5055369 (1991-10-01), Kato et al.
patent: 5073470 (1991-12-01), Kato et al.
patent: 5073471 (1991-12-01), Kato et al.
Patent Abstracts of Japan, vol. 14, No. 289, Jun. 21, 1990.
Patent Abstracts of Japan, vol. 14, No. 162, Mar. 29, 1990.

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