| 摘要 |
The invention relates to a positive-working, radiation-sensitive mixture which contains an organic polymeric binder which is insoluble in water but soluble or at least swellable in aqueous alkaline solution and at least one IR-absorbing cyanine dye having a betaine structure or having a betaine structure and containing an anion and having the formula (I)in whichR1 to R8 independently of one another, are a hydrogen or halogen atom, a sulfonate, carboxylate, phosphonate, hydroxyl, (C1-C4)alkoxy, nitro, amino, (C1-C4)alkylamino, di(C1-C4)alkylamino group or a (C6-C10)aryl group which in turn may be substituted by one or more halogen atoms and/or one or more sulfonate, carboxylate, phosphonate, hydroxyl, (C1-C4)alkoxy, nitro, amino, (C1-C4)alkylamino and/or di(C1-C4)alkylamnino groups,R9 and R10 independently of one another, are a straight-chain or branched (C1-C6)alkyl, a (C7-C6)aralkyl or a (C6-C10)aryl group, each of which in turn may be substituted by one or more halogen atoms and/or one or more sulfonate, carboxylate, phosphonate, hydroxyl, (C1-C4)alkoxy, nitro, amino, (C1-C4)alkylamino and/or di(C1-C4)alkylamino groups,R11 and R12 independently of one another, are (C1-C4)alkyl or (C6-C10)aryl groups which in turn may be substituted,Z1 and Z2 independently of one another, are a sulfur atom, a di(C1-C4)alkylmethylene group or an ethene-1,2-diyl group andA is a carbon atom or a chain having conjugated double bonds which results in the formation of a delocalized II-electron system between the quaternary nitrogen atom of the 3H-indolium, quinolinium or benzothiazolium radical and the enolate oxygen atom of the pyrimidine-2,4,6-trione radical.After imagewise exposure to a laser, the recording material prepared using this mixture can be readily developed with an aqueous alkaline solution without additional processing steps (such as post-bake or postexposure). The invention also relates to a process for the production of printing plates for offset printing from a recording material according to the invention.
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