Radiation-sensitive coating composition

Claim 1

A radiation sensitive polymeric coating composition consisting essentially of (a) an organic solvent, and dissolved therein as the active radiation-sensitive component system, (b) from 80.0 to 99.9%, by weight of the component system, of a homopolyimide or copolyimide which essentially comprises 50 to 100 mol % of recurring structural elements of the formulae Ia and/or Ib ##STR43## and 50 to 0 mol % of recurring structural elements of the formula II ##STR44## and (c) from 0.1 to 20.0%, by weight of the component system, of at least one organic chromophoric polyazide in which the azide groups are bonded to aromatic hydrocarbon radicals either directly or via an SO 2 group, the four carbonyl groups in the formula Ia, Ib and II being bonded to different carbon atoms and any two carbonyl groups being in ortho- or peri-position relative to each other, Z being a tetravalent radical which contains at least one aromatic ring, Z' being a divalent organic radical which differs from the groups of the formulae ##STR45## and is selected from among aromatic, alkylaromatic, aliphatic, cycloaliphatic and heterocyclic radicals, combinations thereof and radicals having oxygen-, sulfur-, nitrogen-, silicon- or phosphorus-containing bridge groups, R 1 and R 2 , independently of each other, each being alkyl having 1-4 C atoms, R 3 , R 4 , R 5 , R 6 , R 7 and R 8 , independently of one another, each being hydrogen, or alkyl having 1-4 C atoms and R 9 being a direct bond, --O--, --S--, --SO--, --S--S--, --SO 2 --, --CO--, --COO--, --NH--, ##STR46## alkyl having 1-6 C atoms in the alkyl, ##STR47## having 1-6 C atoms in the alkyl, ##STR48## a linear or branched alkylene group having 1-3 C atoms, alkylidene having 2-12 C atoms, cycloalkylidene having 5-6 ring carbon atoms, phenylene, ##STR49## group in which R 10 and R 11 are each alkyl or alkoxy having 1-6 C atoms each, phenyl, benzyl, phenyloxy or benzyloxy.