Photosensitive lithographic printing plate
View Patent ↗A photosensitive lithographic printing plate comprising: a hydrophilic support; and a photosensitive layer containing a polymerization initiator, a chain transfer agent, a compound having an ethylenically unsaturated double bond and a polymer binder having a crosslinkable group in a side chain, wherein the chain transfer agent is a thiol compound represented by the following formula (I): in which R represents an alkyl group which may have a substituent or an aryl group which may have a substituent; and A represents an atomic group necessary for forming a 5-membered or 6-membered hetero ring containing a carbon atom together with the N═C—N linkage, and A may have a substituent.
1. A photosensitive lithographic printing plate comprising:
a hydrophilic support; and
a photosensitive layer containing a polymerization initiator, a chain transfer agent, a compound having an ethylenically unsaturated double bond and a polymer binder having a crosslinkable group in a side chain,
wherein the chain transfer agent is a thiol compound represented by the following formula (I):
in which R represents an alkyl group which may have a substituent or an aryl group which may have a substituent; and A represents an atomic group necessary for forming a 5-membered or 6-membered hetero ring containing a carbon atom together with the N═C—N linkage, and A may have a substituent.
2. The photosensitive lithographic printing plate according to claim 1 , wherein the thiol compound represented by the formula (I) is at least one selected from the group consisting of compounds represented by the following formulae (II) and (III):
wherein R represents an alkyl group which may have a substituent or an aryl group which may have a substituent; and X represents a halogen atom, an alkoxy group, an alkyl group which may have a substituent or an aryl group which may have a substituent.
3. The photosensitive lithographic printing plate according to claim 1 , wherein the polymer binder is at least one selected from the group consisting of a (meth)acrylic copolymer having a crosslinkable group in a side chain and a polyurethane resin having a crosslinkable group in a side chain.
4. The photosensitive lithographic printing plate according to claim 1 , wherein the polymerization initiator is at least one selected from the group consisting of a hexaarylbiimidazole compound, an onium salt, a trihalomethyl compound and a metallocene compound.
5. The photosensitive lithographic printing plate according to claim 1 , which further comprises a protective layer so that the hydrophilic support, the photosensitive layer and the protective layer are in this order.
6. The photosensitive lithographic printing plate according to claim 5 , wherein the protective layer comprises a polyvinyl alcohol.
7. The photosensitive lithographic printing plate according to claim 6 , wherein a content of the polyvinyl alcohol in the protective layer is tom 20 to 95% by weight.
8. The photosensitive lithographic printing plate according to claim 6 , wherein the protective layer farther comprises a polyvinyl pyrrolidone or a modified product thereof.
9. The photosensitive lithographic printing plate according to claim 1 , wherein the photosensitive layer further contains a sensitizing dye.
10. The photosensitive lithographic printing plate according to claim 1 , wherein a coating amount of the photosensitive layer is from 0.1 to 10 g/m 2 .