A heat-sensitive imaging laminar medium and a method for the production of a positive-working printing plate from the same heat sensitive material

摘要

According to the present invention there is provided a heat mode imaging element for making a lithographic printing plate having on a lithographic base with a hydrophilic surface a first layer including a polymer, soluble in an aqueous alkaline solution and a top layer on the same side of the lithographic base as the first layer which top layer is unpenetrable for or insoluble in an alkaline developer containing SiO₂ in the form of silicates ; characterized in that said first layer and said top layer comprise a compound capable of converting IR-light into heat.