Patent ID: 7517808

Claim:
A method comprising: (i) applying a photopatternable silicone composition to a surface of a substrate to form a film, where the photopatternable silicone composition comprises (A) an organopolysiloxane containing an average of at least two silicon-bonded alkenyl groups per molecule, (B) an organosilicon compound containing an average of at least two silicon-bonded hydrogen atoms per molecule in a concentration sufficient to cure the composition, and (C) a catalytic amount of a photoactivated hydrosilylation catalyst; (ii) exposing a portion of the film to radiation to produce a partially exposed film having non-exposed regions covering at least a portion of the surface and exposed regions covering the remainder of the surface; (iii) heating the partially exposed film for an amount of time such that the exposed regions are substantially insoluble in a developing solvent and the non-exposed regions are soluble in the developing solvent; (iv) removing the non-exposed regions of the heated film with the developing solvent to form a patterned film; (v) heating the patterned film; and (vi) removing all or a portion of the product of step (v) using an etching solution where step (vi) is performed by immersion of the product of step (v) in the etching solution at ambient temperature for 1 to 25 minutes.