Patent ID: 7855043

Claim:
A heat curable silicon-containing film-forming composition comprising: (A-1) a silicon-containing compound obtained by effecting hydrolytic condensation of a hydrolyzable silicon compound in the presence of an acid catalyst which is selected from mineral acids and sulfonic acid derivatives to form a reaction mixture containing the silicon-containing compound, and substantially removing the acid catalyst from the reaction mixture, (A-2) a silicon-containing compound obtained by effecting hydrolytic condensation of a hydrolyzable silicon compound in the presence of a basic catalyst to form a reaction mixture containing the silicon-containing compound, and substantially removing the basic catalyst from the reaction mixture, (B) a compound having the general formula (1) or (2): L a H b X (1) wherein L is lithium, sodium, potassium, rubidium or cesium, X is a hydroxyl group or a monofunctional or polyfunctional organic acid group of 1 to 30 carbon atoms, “a” is an integer of at least 1, “b” is 0 or an integer of at least 1, and a+b is the number of hydroxyl or organic acid groups, MA (2) wherein M is sulfonium, iodonium or ammonium, and A is a non-nucleophilic counter ion, (C) a monofunctional or polyfunctional organic acid of 1 to 30 carbon atoms, and (D) an organic solvent, wherein component (A-2) is used in an amount of from 0.4 parts by weight per 3.6 parts by weight of component (A-1) to 30 parts by weight per 100 parts by weight of component (A-1).