Radiation-sensitive mixture and use thereof

A radiation-sensitive mixture which is suitable for preparing a polyamide, a polyisoindoloquinazolinedione, a polyoxazinedione, a polyquinazolinedione or a polyquinazolone and which on irradiation with actinic light undergoes solubility differentiation, which mixture comprises

• (a) one or more precursors having structural elements of the general formula (I) ##STR14## where A is --O--, --NH-- or a single bond,
• Q is an unsubstituted or halogen-substituted aromatic tetravalent radical, wherein two at a time of the valences are adjacent to each other,
• B.sup.1 is --O-- or --NR.sup.4 --,
• B.sup.2 is --NH--CO--NH--, --NH--CO--O--, --NH--CO-- or a single bond,
• R.sup.1 is H, alkyl, aryl, an ethylenically unsaturated radical or a readily hydrogen-donating radical selected from the group consisting of isoalkyls, aminoisoalkyls, and groups of the following general formulae:
• ##STR15## where n is 2 or 3,
• R.sup.2 is a bivalent aliphatic or aromatic radical or a single bond,
• R.sup.3 is a bivalent aliphatic, cycloaliphatic, aromatic radical which may be halogen-substituted,
• R.sup.4 is H or straight-chain or branched alkyl which may be halogen-substituted, and
• R.sup.5 is alkyl, aryl, halogen-substituted alkyl or halogen-substituted aryl,
• with the proviso that at least one of Q and R.sup.3 has a readily abstractable hydrogen atom,
• (b) one or more aryl-containing carbonyl compounds which when excited by UV radiation are capable of hydrogen abstraction, and optionally
• (c) one or more substances selected from the group consisting of a photoinitiator, a photosensitizer, a (leuco)dye and an aliphatic ketone.