| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an image forming material excellent in solubility discrimination and useful for a positive planographic printing plate precursor having a low degree of developability change with time after exposure and adaptable to a heat mode. <P>SOLUTION: The image forming material has on a support an image forming layer comprising at least (A) a water-insoluble and alkali-soluble high molecular compound, (B) a photothermal conversion agent and (C) an onium salt represented by the formula X<SP>-</SP>M<SP>+</SP>(wherein X<SP>-</SP>is an anion having at least one substituent having an alkali-dissociating proton and M<SP>+</SP>is a counter cation selected from sulfonium, iodonium, ammonium, phosphonium and oxonium). <P>COPYRIGHT: (C)2004,JPO |
