Compound, photosensitive composition, lithographic printing plate precursor, and method of forming image
View Patent ↗A compound having a novel structure and a photo-sensitive composition comprising (i) the novel compound as a sensitizing dye, (ii) an activator compound generating at least one of a radical and an acid by interacting the activator compound with light absorption of the sensitizing dye to cause chemical change, and (iii) a compound changing its physical or chemical property irreversibly by a reaction with at least one of the radical and the acid.
1. A compound represented by formula (1):
wherein A represents an aromatic or heterocyclic ring which may have a substituent; X represents an oxygen atom, a sulfur atom or ═NR 7 ; R 1 , R 2 , R 3 , R 4 , R 5 , R 6 and R 7 each independently represents a hydrogen atom or a monovalent nonmetallic atom group, provided that at least one of R 2 , R 3 , R 4 , R 5 and R 6 is a substituent represented by —OR 8 , in which R 8 independently represents a monovalent nonmetallic atom group; and n represents an integer of 1 to 6.
2. The compound according to claim 1 , which is represented by formula (2):
wherein X 1 represents an oxygen atom or a sulfur atom; R 1 , R 2 , R 3 , R 4 , R 5 and R 6 each independently represents a hydrogen atom or a monovalent nonmetallic atom group, R 9 and R 10 each independently represents a monovalent nonmetallic atom group, provided that at least one of R 2 , R 3 , R 4 , R 5 and R 6 is a substituent represented by —OR 8 , in which R 8 independently represents a monovalent nonmetallic atom group; and n represents an integer of 1 to 6.
3. A photosensitive composition comprising:
(i) a sensitizing dye according to claim 1 ;
(ii) an activator compound generating at least one of a radical and an acid by interacting the activator compound with light absorption of the sensitizing dye represented by formula (1) to cause chemical change; and
(iii) a compound changing its physical or chemical property irreversibly by a reaction with at least one of the radical and the acid.
4. The photosensitive composition according to claim 3 , wherein the sensitizing dye (i) is represented by formula (2):
wherein X 1 represents an oxygen atom or a sulfur atom; R 1 , R 2 , R 3 , R 4 , R 5 and R 6 each independently represents a hydrogen atom or a monovalent nonmetallic atom group, R 9 and R 10 each independently represents a monovalent nonmetallic atom group, provided that at least one of R 2 , R 3 , R 4 , R 5 and R 6 is a substituent represented by —OR 8 , in which R 8 independently represents a monovalent nonmetallic atom group; and n represents an integer of 1 to 6.
5. The photosensitive composition according to claim 3 , wherein the compound (iii) is an addition-polymerizable compound having an ethylenic unsaturated double bond.
6. The photosensitive composition according to claim 4 , wherein the compound (iii) is an addition-polymerizable compound having an ethylenic unsaturated double bond.
7. A lithographic printing plate precursor comprising:
a photosensitive layer including the photosensitive composition according to claim 3 .
8. A method of forming image comprising:
exposing a predetermined area of a photosensitive layer including the photosensitive composition according to claim 3 .
9. The method according to claim 8 , further comprising:
developing one of the predetermined area and the other area.