Photosensitive lithographic printing plate requiring no fountain solution

A presensitized plate for use in making a lithographic printing plate requiring no fountain solution, which comprises a support and, formed thereon in the order from the support, a photosensitive layer and a silicone rubber layer, wherein said silicone rubber layer is a crosslinked and cured product obtained by addition reaction consisting essentially of (a) polysiloxane having alkenyl groups with (b) hydrogen polysiloxane having .tbd.Si--H groups so that the ratio of the total number of .tbd.Si--H groups in the total amount of (b) relative to the total number of alkenyl groups in the total amount of (a) is from 11 to 30,

• wherein said polysiloxane (a) has at least two alkenyl groups directly bonded to silicon atoms per molecule, average repeating number x of an --[Si(R.sup.1)(R.sup.2)--O].sub.x -- group of 100.ltoreq.x.ltoreq.600 (wherein R.sup.1 and R.sup.2 each represents a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group, a substituted or unsubstituted aralkyl group, a substituted or unsubstituted alkenyl group, a substituted or unsubstituted polydimethylsiloxane group or a substituted or unsubstituted halogenated hydrocarbon group, provided that 70% or more of R.sup.1 and R.sup.2 are methyl groups), and substituted or unsubstituted alkyl groups or substituted or unsubstituted alkenyl groups directly bonded to the terminal silicon atoms, and
• wherein said hydrogen polysiloxane (b) is represented by formula (I);
• R.sup.3 --Si(R.sup.4).sub.2 --O--[SiH(R.sup.4)--O].sub.y --[Si(R.sup.4).sub.2 --O].sub.z --Si(R.sup.4).sub.2 --R.sup.3 (I)
• wherein R.sup.3 represents a hydrogen atom or a methyl group;
• R.sup.4 represents and alkyl group, an aryl group, or an aralkyl group, and R.sup.4 's may be the same or different, provided that 70% or more of R.sup.4 is a methyl group;
• y is from 4 to 100, and z is from 0 to 100.