Photopolymerizable composition and photopolymerizable lithographic printing plate
AssigneeMitsubishi Chemical Corporation
InventorToshiyuki Urano
Life of this patent
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Abstract
A photopolymerizable composition which is highly sensitive to light in the visible region and long-wavelength regions including the near infrared region, is not sensitive to light in the ultraviolet region, and has excellent handling efficiency under day light fluorescent lamps. The composition contains an ethylenically unsaturated compound, a dye which has a basic structure, a photopolymerization initiator, and a photopolymerizable lithographic printing plate which has a support and a layer of the photopolymerizable composition on its surface.
Claims19
A photopolymerizable composition comprising the following components (A), (B) and (C):
- (A) an ethylenically unsaturated compound;
- (B) a dye which has, as a basic structure, a structure having hetero atoms connected via a polymethine chain and which is selected from the group consisting of the following (B-1), (B-2), (B-3) and (B-4):
- (B-1) a dye having, on a polymethine chain, a substituent containing a chain ether bond which forms an oxonium cation or a chain thioether bond which forms a sulfonium cation, upon resonance in the dye molecule,
- (B-2) a dye having, on a polymethine chain, two substituents forming a cyclic ether bond which forms an oxonium cation or a cyclic thioether bond which forms a sulfonium cation, upon resonance in the dye molecule, wherein the two substituents forming a cyclic ether bond or a cyclic thioether bond have a trimethine group represented by the following formula (VIa):
- wherein W3 is an oxygen atom or a sulfur atom, and the hetero ring containing W3 is a substituted or unsubstituted 5- or 6-membered ring,
- (B-3) a dye having, on a polymethine chain, a substituent containing an amino-vinyl bond which forms an aminium cation upon resonance in the dye molecule, and
- (B-4) a dye having, on a polymethine chain or other basic structure, a substituent containing a sulfonic acid anion group;
- and
- (C) a photopolymerization initiator.
Dependencies are inferred from the claim text.