Patent ID: 6685983
Filing Date: 2004-02-03
Classification: C09D,H01L,Y10T

Abstract:
A method for preparing a substantially defect-free dielectric coating on a substrate surface, comprising:(a) admixing (i) a decomposable porogen comprised of a nitrogenous polymer containing a plurality of nitrogenous monomer units, and (ii) a silicon-containing host polymer, in (iii) a casting solvent, wherein the porogen and the host polymer are miscible with respect to each other; (b) depositing the admixture prepared in (a) onto a substrate surface to provide a uncured coating thereon; (c) heating the uncured coating to a temperature effective to cure the host polymer without decomposing the porogen, thereby converting the uncured coating to a vitrified, two-phase coating comprised of vitrified host polymer and the porogen; and (d) decomposing the porogen in the vitrified, two-phase coating.