Photosensitive composition
View Patent ↗A photosensitive composition comprising: a sensitizing dye represented by the following formula (1): in which A represents an optionally substituted aromatic ring or an optionally substituted hetero ring; X represents an oxygen atoms a sulfur atom, or —N(R 6 )—; and R 1 , R 2 , R 3 , R 4 , R 5 , and R 6 each independently represents a hydrogen atom or a monovalent non-metal atomic group; an activator compound being capable of causing a chemical change due to a mutual action with light absorption of the sensitizing dye represented by the formula (1) so as to generate at least one of a radical, an acid and a base; and a compound being capable of reacting with at least one of a radical and an acid so that physical or chemical characteristics thereof change irreversibly.
1. A photosensitive composition comprising:
a sensitizing dye represented by the following formula (1):
in which A represents an optionally substituted aromatic ring or an optionally substituted hetero ring; X represents an oxygen atom; and R 1 , R 2 , R 3 , R 4 , R 5 , and R 6 each independently represents a hydrogen atom or a monovalent non-metal atomic group;
an activator compound being capable of causing a chemical change due to a mutual action with light absorption of the sensitizing dye represented by the formula (1) so as to generate at least one of a radical, an acid and a base; and
a compound being capable of reacting with at least one of a radical and an acid so that physical or chemical characteristics thereof change irreversibly.
2. The photosensitive composition according to claim 1 , wherein the activator compound is a titanocene compound.
3. The photosensitive composition according to claim 1 , wherein the compound being capable of reacting with at least one of a radical and an acid is an addition polymerizable compound having an ethylenically unsaturated double bond.
4. The photosensitive composition according to claim 3 , wherein the addition polymerizable compound has at least one terminal ethylenically unsaturated double bond.
5. The photosensitive composition according to claim 3 , wherein the addition polymerizable compound has at least two terminal ethylenically unsaturated double bonds.
6. The photosensitive composition according to claim 1 , further comprising a cosensitizer.
7. The photosensitive composition according to claim 1 , further comprising a thermal polymerization inhibitor.
8. The photosensitive composition according to claim 1 , wherein A in the formula (1) represents an optionally substituted N,N-diphenylaminobenzene group or an optionally substituted carbazole group.
9. A lithographic printing plate precursor comprising a support and photosensitive layer containing the photosensitive composition according to claim 1 .
10. The lithographic printing plate precursor according to claim 9 , wherein the photosensitive layer further contains a binder polymer.
11. The lithographic printing plate precursor according to claim 9 , further comprising a protective layer containing a water-soluble polymer so that the support, the photosensitive layer and the protective layer are in this order.