Patent ID: 6479198
Filing Date: 2002-11-12
Classification: G03C

Abstract:
A process for preparation of a lithographic printing plate comprising the steps in order of: imagewise exposing to light a silver halide light-sensitive material comprising a hydrophilic support and a silver halide gelatin emulsion layer, subjecting the silver halide light-sensitive material to tanning development to harden gelatin within an exposed area by using a tanning developing agent represented by the formula (I); and removing unhardened gelatin within an unexposed area from the silver halide gelatin emulsion layer to form a relief image of the hardened gelatin on the hydrophilic support; in which L is a n-valent linking group selected from the group consisting of a divalent to hexavalent aliphatic group, a divalent to hexavalent aromatic group, a divalent to hexavalent heterocyclic group, â€”Oâ€”, â€”Sâ€”, â€”COâ€” , â€”NHâ€”, â€”N2â€”, â€”SOâ€” and a combination thereof, wherein the aliphatic group, the aromatic group and the heterocyclic group may have a substituent group; the benzene ring may have a substituent group other than hydroxyl; m is 2 or 3; and n is an integer of 2 to 6.