| 摘要 |
The present invention relates to a positive type image forming material comprising A: an alkali-aqueous-solution-soluble polymer compound having a phenolic hydroxyl group, B: a light and heat decomposing compound which suppresses alkali-aqueous-solution-solubility of said alkali-aqueous-solution-soluble polymer compound (A) having a phenolic hydroxyl group and is decomposed by light or heat to lose its alkali-aqueous-solution-solubility-suppressing effect on said compound (A), and C: a cross-linkable compound which increases said solubility-suppressing effect of said compound (B) when used together with said component (B) in a composition containing the alkali-aqueous-solution-soluble polymer compound (A) having a phenolic hydroxyl group, and which has in its molecule two or more cross-linkable groups which are cross-linked with the alkali-aqueous-solution-soluble polymer compound (A) with heating. This positive type image forming material is suitable for producing a planographic printing plate, which can be directly image-formed by a solid-state laser, semiconductor laser or the like, has excellent image forming property, and has excellent durability in printing.
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