Lithographic printing plate comprising support and imaging layer

A presensitized lithographic plate comprising a support and a hydrophilic image-recording layer convertible into a hydrophobic layer, wherein the hydrophilic image-recording layer has a function of absorbing and retaining water in an amount of 0.01 to 2 g/m2.

A lithographic hydrophilic substrate comprising a support and a hydrophilic layer, wherein the hydrophilic layer has a function of absorbing and retaining water in an amount of 0.01 to 2 g/m2.

A lithographic printing method comprising the steps of:

• subjecting a presensitized lithographic plate comprising a support and a hydrophilic image-recording layer to a process of imagewise converting the hydrophilic image-recording layer into a hydrophobic layer to form a lithographic printing plate which comprises an imaging layer consisting of a hydrophilic area and a hydrophobic area;
• and then printing with the lithographic printing plate while supplying dampening water and oily ink to the plate under the condition that the dampening water is attached on the hydrophilic area in an amount of 0.1 to 2 g/m2 and the oily ink is attached on the hydrophobic area.

A lithographic printing method comprising the steps of:

• subjecting a presensitized lithographic plate comprising a hydrophilic substrate and an image-recording layer, said substrate comprising a support and a hydrophilic layer to a process of imagewise removing the image-recording layer to form a lithographic printing plate which comprises a hydrophilic area corresponding to the exposed hydrophilic layer and a hydrophobic area corresponding to the remaining image-recording layer;
• and then printing with the lithographic printing plate while supplying dampening water and oily ink to the plate under the condition that the dampening water is attached on the hydrophilic area in an amount of 0.1 to 2 g/m2 and the oily ink is attached on the hydrophobic area.

A lithographic printing method comprising the steps of:

• imagewise attaching a hydrophobic material onto a hydrophilic substrate comprising a support and a hydrophilic layer to form a lithographic printing plate which comprises a hydrophilic area where the hydrophobic material is not attached and a hydrophobic area where the hydrophobic material is attached;
• and then printing with the lithographic printing plate while supplying dampening water and oily ink to the plate under the condition that the dampening water is attached on the hydrophilic area in an amount of 0.1 to 2 g/m2 and the oily ink is attached on the hydrophobic area.