Patent ID: 8889229
Filing Date: 2014-11-18
Classification: C08G,C09D,H01L,Y10T

Abstract:
1. A method for formation of a siliceous film, comprising (A) a first coating step, in which a polysilazane composition is applied on a substrate surface having concaved portions and convex portions to form a coating layer having a thickness of 10- 1000 nm, (B) a covering film-formation step, in which said coating layer is hardened only from the surface of the substrate out to 1-50 nm from the surface of the substrate, where the thickness that is hardened is less than the entire thickness of the coating layer, thereby forming a 1 to 50 nm hardened covering film having homogeneous fill along the shape of said substrate surface having concaved portions and convex portions, and (C) an unhardened layer-removal step, in which the polysilazane composition that remains in said coating layer in a part not hardened in the above covering film formation step is removed.