Method for making a lithographic printing plate
AssigneeAgfa-Gevaert
InventorsLode Deprez, Jos Vaes
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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 solution having a pH between 4 and 10.5 and comprising a hydrophobizing agent and a buffer characterized in that said neutralization solution comprises a salt of sulfurous acid.
Claims7
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 solution having a pH between 4 and 10.5 and comprising a hydrophobizing agent, a buffer and an agent having an antioxidation activity characterized in that said neutralization solution further comprises a salt of sulfurous acid and a sequestering compound which is a phosphonic acid, (1-hydroxyethylidene) bis- or its disodium salt.
Dependencies are inferred from the claim text.