Patent ID: 6238838
Filing Date: 2001-05-29
Classification: B41C

Abstract:
A positive-working, radiation-sensitive mixture comprising:an organic, polymeric binder which is insoluble in water but soluble or at least swellable in aqueous alkaline solution, andat least one IR-absorbing anionic cyanine dye, of the formula (I) ##STR4##whereinn is 2 or 3,R.sup.1 to R.sup.8 independently of one another, are a hydrogen or halogen atom, a sulfonate, carboxylate, phosphonate, hydroxyl, (C.sub.1 -C.sub.4) alkoxy, nitro, amino, (C.sub.1 -C.sub.4) alkylamino or di(C.sub.1 -C.sub.4) alkylamino group or a (C.sub.6 -C.sub.10) aryl group which in turn may be substituted by one or more halogen atoms and/or one or more sulfonate, carboxylate, phosphonate, hydroxyl, (C.sub.1 -C.sub.4) alkoxy, nitro, amino, (C.sub.1 -C.sub.4) alkylamino and/or di(C.sub.1 -C.sub.4) alkylamino groups,R.sup.9 and R.sup.10 independently of one another, are a straight-chain or branched (C.sub.1 -C.sub.6) alkyl, a (C.sub.7 -C.sub.16) aralkyl or a (C.sub.6 -C.sub.10) 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, (C.sub.1 -C.sub.4) alkoxy, nitro, amino, (C.sub.1 -C.sub.4) alkylamino and/or di(C.sub.1 -C.sub.4) alkylamino groups,Z.sup.1 and Z.sup.2 independently of one another, are a sulfur atom, a di(C.sub.1 -C.sub.4) alkylmethylene group or an ethene-1,2-diyl group andX.sup.+ is a cation,with the proviso that the dye contains from 2 to 4 sulfonate, carboxylate and/or phosphonate groups but altogether not more than two sulfonate groups.