Patent ID: 7141353

Claim:
A presensitized plate for making a lithographic printing plate, which comprises an aluminum substrate provided thereon with a light-sensitive layer comprising a polyurethane resin binder, an addition polymerizable ethylenically unsaturated bond-containing compound and a photopolymerization initiator, wherein the polyurethane resin binder is one synthesized from at least the following compounds (i), (ii), (iii) and (iv): (i) at least one di-isocyanate compound; (ii) at least one diol compound having at least one carboxyl group; (iii) at least one diol compound whose logP value ranges from −8 to −1, wherein said logP value is defined as a logarithmic value of a balanced concentration ratio P calculated from a proportion of a partition between an octanol layer and a water layer; and (iv) at least one diol compound whose logP value ranges from 1 to 20, provided that the compounds (iii) and (iv) do not include diol compounds each having a carboxyl group, wherein the (iii) diol compound whose logP value ranges from −8 to −1 is selected from the compounds represented by Formula (A′): HO—(CH 2 CH 2 O) n —H (A′) wherein n is an integer of not less than 1.