Photosensitive composition
AssigneesMitsubishi Chemical Corporation, Konica Corporation
InventorsShigeo Tsuji, Akihisa Murata, Toshiyuki Matsumura, Nobuyuki Ishii, Noriyuki Kidu
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Abstract
A photosensitive composition comprising (1) a compound having at least one addition-polymerizable ethylenically unsaturated double bond, (2) an acidic vinyl copolymer soluble or swellable in alkaline water, which contains, in its molecule, a vinyl monomer having an aromatic hydroxyl group, as a constituting unit, (3) a photopolymerization initiator, and (4) a diazo resin, wherein the diazo resin is a copolycondensed compound which contains, in its molecule, an aromatic compound having a carboxyl group and/or a hydroxyl group, and an aromatic diazonium compound, as constituting units.
Claims14
A method for developing a photosensitive lithographic plate, which comprises exposing to light, a photosensitive lithographic plate having a photosensitive composition comprising (1) a compound having at least one addition-polymerizable ethylenically unsaturated double bond, (2) an acidic vinyl copolymer soluble or swellable in alkaline water, which contains, in its molecule, a vinyl monomer having an aromatic hydroxyl group, as a constituting unit, (3) a photopolymerization initiator, and (4) a diazo resin,
- wherein said diazo resin is a polycondensed compound which contains, in its molecule, an aromatic compound having a carboxyl group or a hydroxyl group, or both carboxyl and hydroxyl groups and an aromatic diazonium compound, as constituting units,
- provided on a support, and
- developing said photosensitive lithographic plate with an alkali developer containing not higher than 0.5 wt. % of an organic solvent.
A method for developing a photosensitive lithographic plate, which comprises exposing to light, a photosensitive lithographic plate having a photosensitive composition comprising (1) a compound having at least one addition-polymerizable ethylenically unsaturated double bond, (2) an acidic vinyl copolymer soluble or swellable in alkaline water, which contains, in its molecule, a vinyl monomer having an aromatic hydroxyl group, as a constituting unit, (3) a photopolymerization initiator, and (4) a diazo resin,
- wherein said diazo resin is a polycondensed compound which contains, in its molecule, an aromatic compound having a carboxyl group or a hydroxyl group, or both carboxyl and hydroxyl groups and an aromatic diazonium compound, as constituting units,
- provided on a support, and
- developing said photosensitive lithographic plate with an alkali developer containing no organic solvent.
Dependencies are inferred from the claim text.