Method for making a lithographic printing plate according to the silver salt diffusion transfer process.

摘要

The present invention provides a method for making a lithographic printing plate according to the silver salt diffusion transfer process comprising the steps of exposing and developing an imaging element comprising on a support a silver halide emulsion layer and an image-receiving layer in the presence of a silver halide solvents corresponding to the following formula: Z<1>-(R<1>-X<1>)n-(R<2>-X<2>)-L-(X<3>-R<3>)-(X<4>-R<4>)m-Z<2> (I> wherein X<1>, X<2>,X<3> and X<4> each independently represents -S-, -NH- or -N(R<5>-Z<3>)-, R<1>, R<2>, R<3>, R<4> and R<5> each independently represents an alkylene, an alkenylene or an alkynylene, n and m each independently represents an integer from 0 to 4, Z<1>, Z<2> and Z<3> each independently represents hydrogen, an alkyl group, an amino group, an ammonium group, a hydroxyl, a sulfo group, a carboxyl, an aminocarbonyl or an aminosulfonyl, and L represents an ethylene or a C3 -C4 divalent linking chain, having a group preventing free rotation within this divalent linking chain, X<2> and X<3> being in the thermodynamically most stable conformation of said compound in a favourable position for complexation with a silver ion.