Patent ID: 7014917

Claim:
A method of forming an insulating film between interconnect layers of a semiconductor device comprising the steps of: providing a liquid coating composition by dissolving a siloxane-based resin in an organic solvent; coating a silicon wafer with the liquid coating composition to form a coating film thereon; and heat-curing the coating film, wherein the siloxane-based resin is prepared by hydrolyzing and polycondensing a first monomer of the formula (1) and a second monomer of the formula (2) in an organic solvent in the presence of an acid or alkaline catalyst and water: wherein, R 1 is H, C 1-3 alkyl or C 6-15 aryl; each of X 1 , X 2 and X 3 , independently, is C 1-3 alkyl, C 1-10 alkoxy or halogen, provided that at least one of them is hydrolysable; m is an integer from 0 to 10; and p is an integer from 3 to 8; and wherein, R 2 is H, C 1-3 alkyl or C 6-5 aryl; X 4 is C 1-10 alkoxy; Y 1 is C 1-3 alkyl or C 1-10 alkoxy; and n is an integer from 0 to 10.