Patent ID: 6653042
Filing Date: 2003-11-25
Classification: B41C,Y10S

Abstract:
A lithographic printing plate precursor which comprises a support having provided thereon a layer comprising a hydrophilic medium, wherein the layer comprising the hydrophilic medium contains a hydrophobitization precursor having a hydrophilic surface which is at least one dispersion of particles selected from the group consisting of a dispersion of particles having a composition constitution containing a hydrophilic hydrophobic substance at a core part and having a superficial hydrophilicity at a surface part wherein heat provides hydrophobicity in the vicinity of the particles and a dispersion of particles having a hydrophilic surface and being heat-cross-linkable wherein said cross-linking provides hydrophobicity; and a hydrophilic dye having a light/heat converting property having in a molecule at least one water-soluble group selected from the group consisting of a sulfonic acid group, a carboxyl group, and a phosphonic acid group, or a solid fine particle having a light/heat converting property which has been subjected to surface-hydrophilization treatment wherein upon imagewise irradiation, the imaged portions of the hydrophilic layer are converted to hydrophobic so as to accept printing ink.