Patent ID: 7517633

Claim:
A method for applying a composition to a substrate for forming a gap-filling material, wherein the composition comprises a polymer solution comprising a polymer and a solvent and has a coefficient H of 0.046 or less, which is defined as (logarithmic change in viscosity (mPas))/(change in solid content concentration (% by weight)) and a viscosity of 1 to 80 mPas which is measured at a solid content concentration of 25% by weight; a cross-linking agent having at least two cross-linking forming functional groups; and a cross-linking catalyst, wherein the solvent comprises two or more solvents, comprising 20 to 80% by weight of a high boiling point solvent having a boiling point of 145° to 220° C. and having a boiling point that is 10° C. or more higher than a glass transition temperature of the polymer based on the whole solvent, wherein the method comprises: applying the composition to a substrate having holes with an aspect ratio of 1 or more, which is defined as height/diameter, and drying the composition to form a planarized filling layer on the substrate, and wherein the polymer is a homopolymer comprised of the repeating unit represented by Formula (1) wherein R 1 and R 2 each independently represent a hydrogen atom, a methyl group, a fluorine atom, a chlorine atom, a bromine atom or a cyano group, or a copolymer comprised of the repeating unit represented by Formula (1) and a repeating unit which is a vinyl group that contains an aromatic moiety or a carboxylic acid ester moiety on a side chain thereof wherein a weight-average molecular weight of the polymer is from 500 to 30000, wherein the repeating unit represented by Formula (I) is present in an amount of 20% or more based on the total number of repeating units in the polymer.