Radiation imagery chemistry: process – composition – or product th – Electric or magnetic imagery – e.g. – xerography,... – To produce printing surface
Patent
1983-05-09
1984-07-03
Welsh, John D.
Radiation imagery chemistry: process, composition, or product th
Electric or magnetic imagery, e.g., xerography,...
To produce printing surface
430 89, 430 96, 430327, 101462, G03G 1326
Patent
active
044579926
ABSTRACT:
An etchable electrophotographic printing plate comprising a coating on a surface of an electroconductive support such as grained, anodized aluminum of effective amounts of photoconductive ZnO and of a sensitizing dye dispersed in an organic resin binder comprised of about 60-90 wt. % of C.sub.2 -C.sub.4 alkenyl C.sub.2 -C.sub.8 alkanoate, about 5-30 wt. % of di(C.sub.1 -C.sub.8 alkyl) C.sub.4 -C.sub.8 alkenedionate, about 2-8 wt. % of C.sub.3 -C.sub.8 alkenoic acid or C.sub.4 -C.sub.8 alkenedioic acid, and about 0.5-5.0 wt. % of a cross-linking agent. The preferred thermally cross-linkable organic resin binder is a random copolymer of 70 wt. % vinyl acetate, 24 wt. % dibutyl maleate; 5 wt. % acrylic acid and 1 wt. % glycidyl methacrylate. The etchable printing plate of the present invention is environmentally safe, has excellent shelf life and high sensitivity to actinic radiation. A process of image-wise exposure of the etchable electrophotographic printing plate to a low-power laser combined with an environmentally-safe aqueous etchant to prepare a printing plate that provided 100,000 good quality impressions is also disclosed.
REFERENCES:
patent: 3348944 (1967-10-01), Michalchik
patent: 3581661 (1971-06-01), Flechner
patent: 4168165 (1979-09-01), Kato
patent: 4226930 (1980-10-01), Takimoto
Beeson Karl W.
Bhattacharjee Himangshu R.
Hopf Frederick R.
Allied Corporation
Doernberg Alan M.
Fuchs Gerhard H,.
Hoffman Thomas D.
Welsh John D.
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