Patent ID: 7648894

Claim:
A preparation method of a low dielectric insulating film comprising the steps of: a) preparing an organic polysiloxane precursor having a weight-average molecular weight ranging from 500 to 30,000, and a molar ratio of hydroxy groups 80% or more of the total condensable functional groups; b) preparing a coating composition for production of insulating film by mixing i) said organic polysiloxane precursor, ii) an organic solvent, and iii) water; c) coating said coating composition on a substrate of a semiconductor device; and d) drying and baking said coating composition to produce insulating film, wherein the organic polysiloxane precursor is prepared by hydrolyzation and condensation of one or more silane compounds selected from the group consisting of silane compounds represented by Chemical Formulas 1 to 3 below: SiR 1 p R 2 4-p Chemical Formula 1 where R 1 is hydrogen, an aryl, a vinyl, an allyl, or a linear or branched C 1 to C 4 alkyl substituted by fluorine or unsubstituted, R 2 is a linear or branched C 1 to C 4 alkoxy, and p is an integer of 1 or 2, R 3 q R 4 3-q Si—M—SiR 5 r R 6 3-r Chemical Formula 2 where each of R 3 and R 5 is hydrogen, fluorine, an aryl, a vinyl, an allyl, or a linear or branched C 1 to C 4 alkyl substituted by fluorine or unsubstituted, each of R 4 and R 6 is a linear or branched C 1 to C 4 alkoxy, M is a C 1 to C 6 alkylene or phenylene, and each of q and r is an integer of 0 to 2, and where R 7 is hydrogen, fluorine, an aryl, a vinyl, an allyl, or a linear or branched C 1 to C 4 alkyl substituted by fluorine or unsubstituted, R 8 is hydrogen, a hydroxy, or a linear or branched C 1 to C 4 alkoxy or —(CH 2 ) a —SiR 9 R 10 (where a is 2 or 3), R 9 is fluorine, an aryl, a vinyl, an allyl, or a linear or branched C 1 to C 4 alkyl substituted by fluorine or unsubstituted, R 10 is a linear or branched C 1 to C 4 alkoxy, and each of m and n is an integer of 3 to 7.