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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430115, 430137, 430904, G03G 912

Patent

active

048371025

ABSTRACT:
A liquid developer for electrostatic photography comprising a carrier medium having an electrical resistivity of not less than 10.sup.9 106.cm and a dielectric constant of not more than 3.5 having dispersed therein at least a resin, wherein said resin is a copolymer resin obtained by copolymerizing (1) a solution containing at least one copolymer having an unsaturated bond obtained by copolymerizing at least one monomer (A) represented by formula (I) shown below and at least one monomer (B) represented by formula (II) shown below, and reacting the resulting copolymer with at least one monomer (C) represented by formula (III) shown below, (2) at least one monomer (D) which is soluble in the carrier medium but becomes insoluble upon polymerization, and (3) at least one monomer (E) represented by formula (IV) shown below to obtained a resin dispersion: ##STR1## wherein a.sub.1, a.sub.2 a.sub.3, b.sub.1, b.sub.2, b.sub.3, d.sub.1, d.sub.2, d.sub.3, e.sub.1, e.sub.2, e.sub.3, X, Y, V, Z, L, F, Q, G, R.sub.1, R.sub.2, R.sub.3, T.sub.1, T.sub.2, U, m and n are defined in the specification. The developer is excellent in redispersibility, preservability, stability, image reproducibility, and fixing properties and is capable of producing a master plate for offset printing having excellent printing durability.

REFERENCES:
patent: 4618557 (1986-10-01), Dan et al.
patent: 4665002 (1987-05-01), Dan et al.

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