Patent ID: 8113116

Claim:
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 a cyanine dye, a polymerization initiator, a polymerizable compound and at least one of the compounds represented by the following formulae (1) to (2): R 1 SO 3 − A + ) n (1) R 2 NR 3 —SO 3 − A + ) n (2) wherein R 1 represents a substituted or unsubstituted alkyl group having 9 or less carbon atoms, wherein R 2 represents a substituted or unsubstituted alkyl group having 9 or less carbon atoms or a substituted or unsubstituted aryl group having 10 or less carbon atoms, R 3 represents a hydrogen atom, a substituted or unsubstituted alkyl group having 9 or less carbon atoms or a substituted or unsubstituted aryl group having 10 or less carbon atoms, A represents lithium or sodium, and n represents an integer of from 1 to 3.