Method for forming optically smooth polymeric layers.

摘要

A method for forming an optically smooth layer on a substrate comprising the sequential steps of: a. applying to the substrate a layer of a flowable Newtonian liquid composition comprising (1) a film-forming polymer, and (2) a mutually soluble thermally activatable liquid cross-linking agent, both dissolved in (3) a volatile organic solvent; b. raising the temperature of the flowable liquid layer to a temperature below the activation temperature of the cross-linking agent by which the thickness of the layer is reduced but the layer remains flowable at the raised temperature. c. raising the temperature of the flowable layer to a level above the activation temperature to initiate cross-linking and to effect removal of solvent by evaporation and to induce polymer flow; and d. heating the solvent-free flowed polymer solution layer to effect cross-linking of the polymer solution to an extent that the solution of polymers becomes thermoset.