Patent ID: 8821739

Claim:
A method for processing a substrate, comprising: providing a substrate having a surface; providing a copolymer composition, comprising: a poly(styrene)-b-poly(siloxane) block copolymer component, wherein the number average molecular weight of the poly(styrene)-b-poly(siloxane) block copolymer component is 5 to 1,000 kg/mol; and, an antioxidant; applying a film of the copolymer composition to the surface of the substrate; optionally, baking the film; annealing the film by heating the film at 275 to 350° C. under a gaseous atmosphere for a period of 1 second to 4 hours; and, treating the annealed film to remove the poly(styrene) block from the annealed film and to convert the poly(siloxane) block in the annealed film to SiO x .