Patent ID: 6251563
Filing Date: 2001-06-26
Classification: B41C,Y10S

Abstract:
A method for making lithographic printing plates including the following steps:a) preparing a heat mode imaging element consisting of a lithographic base with a hydrophilic surface and a top layer which top layer includes an IR-absorbing pigment and 3,4,5-trimethoxybenzoic acid and is sensitive to IR-radiation and does not include diazo compounds, photoacids, photoinitiators, quinone diazides, and sensitizers which absorb in the wavelength range of 250 nm to 650 nm and a polymer, soluble in an aqueous alkaline solution and is unpenetrable for an alkaline developer containing SiO.sub.2 as silicates;b) exposing imagewise said heat mode imaging element to IR-radiation;c) developing said imagewise exposed heat mode imaging element with said alkaline developer so that the exposed areas of the top layer are dissolved and the unexposed areas of the top layer remain undissolved.