Dampening solution for printing with a lithographic printing pla

Details Dampening solution for printing with a lithographic printing pla Dampening solution for printing with a lithographic printing pla

1995-10-02

1996-12-24

Schilling, Richard L.

Radiation imagery chemistry: process, composition, or product th

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

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

430302, 101465, G03C 806, G03F 707

Patent

active

055872719

ABSTRACT:
The present invention provides a method for lithographic printing comprising the following steps:
preparing a lithographic printing plate according to the silver salt diffusion transfer process by (1) image-wise exposing an imaging element comprising on a support a photosensitive layer comprising a silver halide emulsion and an image receiving layer containing physical development nuclei in water permeable relationship with said emulsion layer, (2) developing said imaging element in the presence of developing agent(s) and silver halide solvent(s) using an alkaline processing liquid and (3), if said emulsion layer is overlying said image receiving layer, removing the layers overlying said image receiving layer,
mounting said lithographic printing plate to a lithographic printing press, and
printing while supplying to said lithographic printing plate a dampening solution and a printing ink characterized in that the dampening solution as used on the printing plate contains less than 1.0 g/l of a transparent pigment with an average grain diameter of less than 0.1 .mu.m and at least 0.35 g/l of a clay incorporating an inorganic polyphosphate peptiser.

REFERENCES:
patent: 3728114 (1973-04-01), Futaki et al.
patent: 4361639 (1982-11-01), Kanada et al.
patent: 4563410 (1986-01-01), De Jaeger et al.
patent: 5432042 (1995-07-01), Deprez et al.

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