Photopolymerizable recording materials containing a triazole sensitizer and photoresist layers and lithographic printing plates based thereon

Claim 1

A photopolymerizable recording material composed of one or more photopolymerizable olefinically unsaturated organic compounds, a polymeric binder, one or more photopolymerization initiators, a color-forming system which on irradiation with actinic light causes an increase in the color intensity of the recording material, a sensitizer and further auxiliary substances, wherein the sensitizer comprises one or more compounds of the formula I ##STR22## where A is one of the radicals of the formulae (II) to (IV) ##STR23## R is hydrogen or C 1 -C 8 R 1 is C 1 -C 12 -alkyl, C 1 -C 12 -alkoxy, phenyl or an NR 5 R 6 group where R 5 and R 6 are identical to or different from each other and each is C 1 -C 12 -alkyl; allyl; phenylalkyl having 1 to 4 carbon atoms in the alkyl group; phenyl; phenyl substituted by C 1 -C 4 -alkyl, C 1 -C 4 -alkoxy or halogen; C 1 -C 12 -alkyl substituted by OH--, halogen-, CN--, --O--CO-alkyl having 1 to 6 carbon atoms in the alkyl group or --CO--O-alkyl having 1 to 6 carbons in the alkyl group; oxaalkyl of 3 to 12 carbon atoms and 1 to 5 oxygen atoms; or R 5 and R 6 carbon atoms and 1 to 5 oxygen atoms; or R 5 and R 6 together form a julolidine, carbazole, morpholine, piperidine or N-alkyl-piperidine radical, R 2 is hydrogen, C 1 -C 12 -alkyl, C 1 -C 12 -alkoxy, halogen or trialkylsilyl, n is 1 or 2, R 3 and R 4 are identical to or different from each other and each is C 1 -C 8 -alkyl, cycloalkyl, CO 2 R 7 where R 7 is C 1 -C 8 -alkyl, cycloalkyl, CO 2 R 7 where R 7 is C 1 -C 12 -alkyl; aryl; phenyl; or phenyl substituted by halogen, C 1 -C 12 -alkyl- or C 1 -C 4 -alkoxy; or R 3 and R 4 together form a carbocyclic or heterocyclic saturated or unsaturated fused ring system which is monosubstituted or polysubstituted by halogen; OH; CN; --O--CO-alkyl having 1 to 6 carbon atoms in the alkyl group; --CO--O-alkyl having 1 to 8 carbon atoms in the alkyl groupl trifluoromethyl; C 3 -C 6 -cycloalkyl; C 1 -C 8 -alkoxy; phenylalkyl having 1 to 4 carbon atoms in the alkyl gorup; C 1 -C 12 -alkyl; C 1 -C 12 -alkyl substituted by OH-, halogen-, CN--, --O--CO-alkyl- having 1 to 6 carbon atoms in the alkyl group, or --CO--O-alkyl having 1 to 6 carbon atoms in the alkyl group; oxaalkyl containing 2 to 12 carbon atoms and 1 to 6 oxygen atoms; trialkylsilyl having 1-4 carbons in the alkyl groups; or NR 8 R 9 , where R 8 and R 9 are identical to or different from each other and each is C 1 -C 8 -alkyl; C 1 -C 8 -alkyl substituted by OH, halogen-, CN--, --O--CO-alkyl having 1 to 6 carbon atoms in the alkyl group or --CO--O-alkyl having 1 to 6 carbon atoms in the alkyl group; oxaalkyl containing 3 to 12 carbon atoms and 1 to 5 oxygen atoms; phenylalkyl having 1 to 4 carbon atoms in the alkyl group; phenyl; or phenyl substituted by C 1 -C 4 -alkyl, C 1 -C 4 -alkoxy- or halogen, with the proviso that the maximum of the long-wave absorption band of these compounds is below 420 nm.