| 摘要 |
PURPOSE: To provide a planographic printing material capable of utilizing any supporting body, with good ink building up, no base dirt, making plate placing possible, with high image quality and high printing capability by including a specific silver halide emulsion in a silver halide photosensitive layer. CONSTITUTION: A silver halide emulsion spectrally sensitized by at least one kind of compounds represented by formula I or II is included in a silver halide photosensitive layer. In formula I, Z, Z1 indicate a nonmetallic atom group necessary to complete a 5 or 6 membered nitrogen containing heterocyclic ring, R, R1 indicate an alkyl group or aryl group, Q, Q1 indicate a nonmetallic atom group necessary to complete together 4-thiazolidone, 4-imidazolinedione nucleus, L, L1 , L2 each indicates a methine group, and X indicates an anion. In formula II, R11 indicates an alkyl group, Z11 indicates an atomic group necessary to form 5 or 6 membered nitrogen containing heterocyclic ring, D, Da indicate an atomic group necessary to form a non-cyclic or cyclic acidic nucleus, L11 -L16 indicate a methine group, and M11 indicates a charge neutralizing pair ion. |
