Abstract: A presensitized plate useful for making a lithographic printing plates comprises an aluminum substrate provided thereon with a photopolymerizable light-sensitive layer, wherein the light-sensitive layer comprises an ethylenically unsaturated bond-containing compound having at least three methacryloyl or acryloyl groups alone or in any combination in the molecule and the substrate is Substrate A, which has, on the surface, grained structures comprising medium waved structure whose average pore size ranges from 0.5. to 5 ?m and small waved structure whose average pore size ranges from 0.01 to 0.2 ?m, which are superimposed; or Substrate B, which has, on the surface, grained structures comprising large waved structure whose average wavelength ranges from 5 to 100 ?m, medium waved structure whose average pore size ranges from 0.5 to 5 ?m and small waved structure whose average pore size ranges from 0.01 to 0.2 ?m, which are superimposed.

Abstract: A photopolymerization process is disclosed, which comprises exposing a photosensitive lithographic printing plate containing at least one of sensitizing dyes represented by the following general formula (I) to laser beam having a wavelength of not greater than 450 nm: wherein T represents OR, SR, N(R)2 or SO2R and at least one T is present in the ortho or para position of the vinyl group, with the proviso that when the site at which Y is connected to the phenyl ring is an oxygen atom, sulfur atom or nitrogen atom, T may not be present; X represents an oxygen atom, sulfur atom or NR; Y represents a nonmetallic atom group which forms a ring with the adjacent carbon atoms; and R's each represent a hydrogen atom or nonmetallic atom group and may be connected to each other.

Abstract: A photosensitive composition containing an infrared absorber, a borate compound, a polymerizable compound, a binder polymer, and a compound having a weight average molecular weight of not more than 3,000 and containing at least one carboxylic acid group.

Abstract: A photosensitive image-recording material comprising a support having provided thereon a photosensitive layer and an oxygen-cutoff layer (protective layer).

Abstract: A presensitized plate useful for making a lithographic printing plates comprises an aluminum substrate provided thereon with a photopolymerizable light-sensitive layer, wherein the light-sensitive layer comprises an ethylenically unsaturated bond-containing compound having at least three methacryloyl or acryloyl groups alone or in any combination in the molecule and the substrate is Substrate A, which has, on the surface, grained structures comprising medium waved structure whose average pore size ranges from 0.5. to 5 &mgr;m and small waved structure whose average pore size ranges from 0.01 to 0.2 &mgr;m, which are superimposed; or Substrate B, which has, on the surface, grained structures comprising large waved structure whose average wavelength ranges from 5 to 100 &mgr;m, medium waved structure whose average pore size ranges from 0.5 to 5 &mgr;m and small waved structure whose average pore size ranges from 0.01 to 0.2 &mgr;m, which are superimposed.

Abstract: A photopolymerization process is disclosed, which comprises exposing a photosensitive lithographic printing plate containing at least one of sensitizing dyes represented by the following general formula (I) to laser beam having a wavelength of not greater than 450 nm: 1

Abstract: A photosensitive image-recording material comprising a support having provided thereon a photosensitive layer and an oxygen-cutoff layer (protective layer).

Abstract: A photosensitive composition for short wave exposure use, which comprises (i) a sensitizing dye as a 1,3-dihydro-1-oxo-2H-indene derivative having a specified structure, (ii) an activator compound that generates chemical changes by its interaction with an electronic excitation condition induced by light absorption of the sensitizing dye represented by formula (I) and thereby produces at least any one of radicals, acids and bases and (iii) a compound whose physical or chemical characteristics are changed and maintained by undergoing reaction with at least one of radicals, acids and bases.