Lithographic printing plate precursor

Abstract

A lithographic printing plate precursor which is capable of undergoing on-press development by supplying at least one of printing ink and dampening water and includes a support and an image-recording layer, wherein the image-recording layer contains at least one of compounds represented by the formulae (1) to (3) as defined herein.

Description

Claims

1. A lithographic printing plate precursor which is capable of undergoing on-press development by supplying at least one of printing ink and dampening water and comprises a support and an image-recording layer, wherein the image-recording layer contains at least one of compounds represented by the following formulae (1) to (3): R1SO3−A+)n  (1)R2NR3—SO3−A+)n  (2)

2. The lithographic printing plate precursor as claimed in claim 1, which further comprises a protective layer so that the support, the image-recording layer and the protective layer are provided in this order.

3. A lithographic printing plate precursor which is capable of undergoing on-press development by supplying at least one of printing ink and dampening water and comprises a support, an image-recording layer and a protective layer in this order, wherein the protective layer contains a compound represented by the following formula (3):

4. The lithographic printing plate precursor as claimed in claim 1, wherein R1 in the formula (1) is a straight chain alkyl group having from 4 to 7 carbon atoms.

5. The lithographic printing plate precursor as claimed in claim 1, wherein R1 in the formula (1) has a benzene skeleton or a naphthalene skeleton.

6. The lithographic printing plate precursor as claimed in claim 1, wherein R2 in the formula (2) has a cycloalkyl skeleton.

7. The lithographic printing plate precursor as claimed in claim 1, wherein the image-recording layer contains an infrared absorbing agent, a polymerization initiator and a polymerizable compound.

8. The lithographic printing plate precursor as claimed in claim 3, wherein the image-recording layer contains an infrared absorbing agent, a polymerization initiator and a polymerizable compound.

9. The lithographic printing plate precursor as claimed in claim 1, wherein the image-recording layer contains at least one of a microcapsule and microgel.

10. The lithographic printing plate precursor as claimed in claim 3, wherein the image-recording layer contains at least one of a microcapsule and microgel.

11. The lithographic printing plate precursor as claimed in claim 1, wherein the image-recording layer contains an infrared absorbing agent and a hydrophobilizing precursor.

12. The lithographic printing plate precursor as claimed in claim 3, wherein the image-recording layer contains an infrared absorbing agent and a hydrophobilizing precursor.

13. The lithographic printing plate precursor as claimed in claim 2, wherein the image-recording layer or the protective layer contains an inorganic stratiform compound and a phosphonium compound represented by the following formula (4):

14. The lithographic printing plate precursor as claimed in claim 3, wherein the image-recording layer or the protective layer contains an inorganic stratiform compound and a phosphonium compound represented by the following formula (4):