Patent ID: 7399504

Claim:
A method comprising the steps of a) applying to a substrate a solution of a solvent and a polymer containing labile solubilizing groups; b) removing the solvent from the solution to form a soluble polymer film; and c) removing a sufficient amount of the labile solubilizing groups from the soluble polymer film or converting a sufficient amount of the labile solubilizing group to less soluble groups, to form a film on the substrate that is less soluble in the solvent than before the removal or conversion of the labile solubilizing groups, wherein the polymer contains structural units selected from the group consisting of fluorene-2,7-diyls and triarylamine-diyls and the labile solubilizing groups contain a) a C 4 -C 30 hydrocarbyl or b) a C 3 -C 30 hydrocarbyl containing one or more heteroatoms of S, N, Si, P, or O, or c) an aralkyl group and optionally one or more heteroatoms of S, N, Si, P, or O.