Abstract: A photosensitive lithographic printing plate requiring no fountain solution, which comprises an aluminum base and, formed thereon in the following order, a primer layer, a photosensitive layer, and a silicone rubber layer, wherein the aluminum base has a roughened surface with an average roughness (R.sub.a) of from 0.2 .mu.m to 0.8 .mu.m and a whiteness of from 0.10 to 0.35, and the primer layer is a homogeneous layer comprising a binder as the main component. The lithographic printing plate requiring no fountain solution is excellent in tone reproducibility, suitability for plate inspection, suitability for plate scanner examination, and press life.

Abstract: The present invention relates to a photosensitive lithographic plate requiring no dampening water, which comprises a support, a primer layer comprising a gelatin and a silane coupling agent, a photosensitive layer, and a silicone rubber layer in this order. According to the present invention, a photosensitive lithographic plate having a primer layer with an excellent resistance to a solvent and dyeability is obtained.

Abstract: A photosensitive lithographic plate is suitable for use in making a water-less lithographic plate which does not require dampening water. The photosensitive lithographic plate has a primer layer containing a hardened gelatin, a photosensitive layer and a silicone rubber layer. The silicone rubber layer and the photosensitive layer are imagewise removed as a result of the imagewise exposure and development so as to expose portions of the primer layer corresponding to an image. The exposed gelatin-containing plate is securely adhered to the substrate and is easily dyeable for examination of the formed image.

Abstract: A presensitized plate for use in making a lithographic printing plate requiring no dampening water which comprises a substrate having provided thereon a primer layer, a photodimerizable photosensitive layer containing at least one organotin compound and at least one silane coupling agent in a total amount of 0.1 to 20% by weight of the photosensitive resin and a silicone rubber layer, in order, the photosensitive layer of the presensitized plate is formed by previously incorporating the above two compounds into a photosensitive resin composition and then applying the composition to the surface of the primer layer or by contacting a solution containing the compounds with the previously formed photosensitive layer and penetrating the solution into the photosensitive layer. The dry presensitized plate is extremely strong in adhesiveness between the primer layer and the photosensitive layer and exhibits a relatively broad developing latitude and a good image reproducibility.