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Abstract

Radiation-sensitive compositions comprising (a1) a cationically or acid-catalytically polymerizable or crosslinkable compound or (a2) a compound that increases its solubility in a developer under the action of acid; and (b) at least one diaryliodonium salt of formula I 1 wherein X is branched C.sub.3-C.sub.20alkyl or C.sub.3-C.sub.8cycloalkyl; X.sub.1 is hydrogen, linear C.sub.1-C.sub.20alkyl, branched C.sub.3-C.sub.20alkyl or C.sub.3-C.sub.8cycloalkyl; with the proviso that the sum of the carbon atoms in X and X.sub.1 is at least 4; Y is linear C.sub.1-C.sub.10alkyl, branched C.sub.3-C.sub.10alkyl or C.sub.3-C.sub.8cycloalkyl; A.sup.- is a non-nucleophilic anion, selected from the group (BF.sub.4).sup.-, (SbF.sub.6).sup.-, (PF.sub.6).sup.-, (B(C.sub.6F.sub.5)).sub.4.sup.-, C.sub.1-C.sub.20alkylsulfonate, C.sub.2-C.sub.20haloalkylsulfonate, unsubstituted C.sub.6-C.sub.10arylsul-fonate, camphorsulfonate, and C.sub.6-C.sub.10arylsulfonate substituted by halogen, NO.sub.2, C.sub.1-C.sub.12alkyl, C.sub.1-C.sub.12halo-alkyl, C.sub.1-C.sub.12alkoxy or by COOR.sub.1; and R.sub.1 is C.sub.1-C.sub.20alkyl, phenyl, benzyl; or phenyl mono- or poly-substituted by C.sub.1-C.sub.12alkyl, C.sub.1-C.sub.12alkoxy or by halogen; with the proviso that the two phenyl rings on the iodine atom are not identically substituted, have high sensitivity, high storage stability, good solubility and a low tendency to crystallize.

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