Method for making a lithographic printing plate
AssigneeAgfa-Gevaert
InventorsJos Vaes, Luc Wabbes
Life of this patent
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Abstract
The present invention provides a method for making a lithographic printing plate according to the silver salt diffusion transfer process comprising the steps of: 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, developing said imaging element in the presence of developing agent(s) and silver halide solvent(s) using an alkaline processing liquid and neutralizing a thus obtained developed imaging element using a neutralization liquid having a pH between 5 and 7 characterized in that said neutralization liquid contains a total concentration of phosphate ions between 0.2 mol/l and 0.4 mol/l.
Claims9
A method for making a lithographic printing plate according to the silver salt diffusion transfer process comprising the steps of:
- image-wise exposing an imaging element comprising on a support in the order given a photosensitive layer comprising a silver halide emulsion and an image receiving layer containing physical development nuclei,
- developing said imaging element in the presence of developing agent(s) and silver halide solvent(s) using an alkaline processing liquid and
- neutralizing a thus obtained developed imaging element using a neutralization liquid having a pH between 5 and 7 characterized in that said neutralization liquid contains a total concentration of phosphate ions between 0.2 mol/l and 0.4 mol/l.
Dependencies are inferred from the claim text.