Method for the preparation of layer structures

Claim 1

In a method for the preparation of highly heat-resistant layered structures soluble in organic solvents comprising: a. applying a coating of a radiation-sensitive, preliminary polymer to a substrate in the form of a layer or a foil; b. irradiating the radiation sensitive layer or foil through negative patterns; c. removing the non-irradiated layer or foil to form a relief structure; and d. annealing said relief structure; the improvement which comprises using as said radiation sensitive preliminary polymer a solvent soluble preliminary polymer comprising a polycondensation product of a primary diamine with bicyclo[2.2.2.]octene-7-tetracarboxylic acid-2,3,5,6-diester-bis-acid chloride or with a mixture of said bicyclo[2.2.2.]octene with a compound selected from the group consisting of an aromatic di-ortho-tetracarboxylic acid diester-bis-acid chloride, an aromatic di-ortho-tetracarboxylic acid-bis-anhydride and mixtures thereof; wherein the ester groups of said bicyclo[2.2.2.]octene-7-tetra-carboxylic acid-2,3,5,6-diester-bis-acid chloride and said di-ortho-tetracarboxylic acid diester-bis-acid chloride are in ortho position with respect to said acid chloride groups, said ester groups containing radiation reactive radicals selected from the group consisting of: ##STR5## wherein R 1 is alkylene or aralkylene; R 2 is hydrogen, CH 3 or Cl and R 3 is hydrogen; ##STR6## wherein R 4 is hydrogen or methyl; and R 5 is oxyalkylene; ##STR7## wherein R 6 is alkyl, phenyl, alkoxy phenyl or halogenated phenyl; n is 1 or 2; and R.sub. 7 is H, Cl, alkyl or alkoxy; ##STR8## wherein R 8 is a carbocyclic or heterocyclic aromatic radical bound via a ring carbon atom, and wherein said radiation-sensitive preliminary polymer is prepared in a hexamethyl phosphoric acid triamide solution.