Patent ID: 6772687
Filing Date: 2004-08-10
Classification: B41C

Abstract:
A method for the preparation of a lithographic printing plate comprising the following steps, in order,:(1) mounting on a printing press a printing plate precursor comprising a lithographic support and an image forming layer, capable of being dissolved and removed by the application of fountain and/or ink on said press, (2) prior to, or after step (1), dispensing image-wise by means of ink jet printing droplets of a fluid onto the surface of said lithographic printing plate precursor, characterized in that said fluid comprises in a solvent carrier a dissolution inhibitor compound capable of inhibiting or reducing the dissolving and removing action of fountain and/or ink on said image forming layer, (3) drying the plate precursor to at least partially remove the solvent carrier of said fluid, (4) applying fountain and/or ink onto the dried plate precursor, thereby removing the areas of said image forming layer, not imaged by ink jet printing, and simultaneously exposing the surface of said lithographic support, while retaining completely or at least partially the areas of said image forming layer, imaged by ink jet printing wherein said image forming layer contains an anionically stabilized compound.