Method of printing with using lithographic printing plate made b

Details Method of printing with using lithographic printing plate made b Method of printing with using lithographic printing plate made b

1996-02-23

1998-02-03

Lesmes, George F.

Radiation imagery chemistry: process, composition, or product th

Transfer procedure between image and image layer, image...

Diffusion transfer process, element, or identified image...

430264, 430331, 1014501, 101451, G03C 554

Patent

active

057143021

ABSTRACT:
The present invention provides a printing method using a silver salt lithographic printing plate obtained by imagewise exposing a silver salt lithographic printing plate precursor comprising a support and, provided thereon, at least a silver halide emulsion layer and a physical development nuclei layer and then subjecting the exposed printing plate precursor to silver complex diffusion transfer development and using a dampening composition containing a nonionic surface-active agent ##STR1## wherein R represents an alkyl group of 1-9 carbon atoms, and n.sub.1 and n.sub.2 are mol numbers necessary for the polymer having an average molecular weight of 250 or more, and n.sub.1
.sub.2 is 0.5-2, and a ##STR2## wherein m is a number which provides a number-average molecular weight of 2000-50000 for the polymer. By applying the above-mentioned dampening composition to the silver salt printing plate, a sufficiently high printing performance can be obtained without using colloidal silica or colloidal alumina in the dampening composition.

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Polymer Science Dictionary, Mark S. M. Alger pp. 373 and 399.

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