A method of preparation of a Lithographic Printing Plate comprising the
steps of, selecting a substrate for making of the printing plate from a
natural or synthetic polymeric sheet element material having a tensile
strength in the range of 400 to 3000 Kgm/cm2 and thickness ranging from
75 microns to 250 microns; shrinking the said substrate to have shrinkage
in the range of 0.2 to 2.0% by exposing the substrate to heat of
temperatures ranging from 140 to 180 degrees Celsius for 8 to 12 minutes;
subbing the substrate to alter the surface energy of the substrate;
forming a hydrophilic lithographic coating by reacting a hydrophilic
binder with a cross linking agent, an accelerator, at least one pigment,
at least one cationic surfactant and particulate silica having micron
size ranging between 1 to 5 microns and a pore volume ranging between 0.2
ml/gm to 1.8 ml/gm wherein the ratio of the catalyst to accelerator to
cross linking agent to binder to pigment to anionic surfactant to
particulate silica is 1:2 to 1:2 to 2:1 to 20:25 to 60:80 parts and
applying at least one ply of the hydrophilic lithographic coating on the
subbed substrate.