| 摘要 |
The present invention provides a negative-working image recording material which can be used as a lithographic printing plate for so-called direct plate making process comprising directly making plate from digital signal such as computer signal. A novel negative-working image recording material is provided, comprising a high-molecular compound having a weight-average molecular weight of from 5,000 to 400,000 and a repeating unit represented by the following general formula (I), and a substance which absorbs light to generate heat: <IMAGE> (I) wherein R1 represents a hydrogen atom, a halogen atom, a cyano group (-CN) or an alkyl group; R2 represents an alkyl group, an aralkyl group or an aromatic ring group; L1 represents a single bond or a phenylene group; L2 represents an alkylene group, an alkenylene group or an aromatic ring group; X represents a single bond, -O-, -OCO-, -COO-, -CONR3-, -CONR3CO-, -CONR3SO2-, -NR3-, -NR3CO-, -NR3SO2-, -SO3-, -SO2NR3- or -SO2NR3CO-; and R3 represents a hydrogen atom, an alkyl group, an aralkyl group or an aromatic ring group. The negative-working image recording material according to the present invention can provide a lithographic printing plate which can be exposed to infrared laser to undergo heat mode writing and exhibits a high sensitivity and developability when developed with an aqueous developer.
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