Patent ID: 7875317

Claim:
An insulating-film-forming composition, comprising: a hydrolysis-condensation product obtained by hydrolyzing and condensing a hydrolyzable-group-containing silane monomer (A) in the presence of a polycarbosilane (B) including a hydrolyzable group and a basic catalyst (C); and an organic solvent, wherein the component (A) is at least one silane compound selected from the group consisting of compounds of the following general formulas (1) to (3), R a Si(OR 1 ) 4-a (1) wherein R represents a hydrogen atom, a fluorine atom, or a monovalent organic group, R 1 represents a monovalent organic group, and a represents 1 or 2, Si(OR 2 ) 4 (2) wherein R 2 represents a monovalent organic group, R 3 b (R 4 O) 3-b Si—(R 7 ) d —Si(OR 5 ) 3-c R 6 c (3) wherein R 3 to R 6 individually represent monovalent organic groups, b and c individually represent integers from 0 to 2, R 7 represents an oxygen atom, a phenylene group, or a group —(CH 2 ) m — (wherein m represents an integer from 1 to 6), and d represents 0 or 1, and the component (B) is a polycarbosilane compound of the following general formula (4), wherein R 8 represents a group selected from the group consisting of a hydrogen atom, a halogen atom, a hydroxyl group, an alkoxy group, an acyloxyl group, a sulfone group, a methanesulfone group, a trifluoromethanesulfone group, an alkyl group, an aryl group, an allyl group, and a glycidyl group, R 9 represents a group selected from the group consisting of a halogen atom, a hydroxyl group, an alkoxy group, an acyloxyl group, a sulfone group, a methanesulfone group, a trifluoromethanesulfone group, an alkyl group, an aryl group, an allyl group, and a glycidyl group, R 10 and R 11 individually represent groups selected from the group consisting of a halogen atom, a hydroxyl group, an alkoxy group, an acyloxyl group, a sulfone group, a methanesulfone group, a trifluoromethanesulfone group, an alkyl group having 2 to 6 carbon atoms, an aryl group, an allyl group, and a glycidyl group, R 12 to R 14 individually represent a substituted or unsubstituted methylene group, a substituted or unsubstituted alkylene group, a substituted or unsubstituted alkenyl group, a substituted or unsubstituted alkynyl group, or a substituted or unsubstituted arylene group, and x, y, and z individually represent integers from 0 to 10,000, provided that “5<x+y+z<10,000” is satisfied, and wherein the amount of the component (B) is 5 to 100 parts by weight for 100 parts by weight of the component (A) converted into a complete hydrolysis-condensation product.