Patent ID: 7358300

Claim:
A composition for forming silica based coating film which comprises component (a): siloxane resin obtained by hydrolytic condensation of a compound represented by the following formula (1): R 1 n SiX 4-n (1) (wherein R 1 represents an H atom or F atom, a group containing a B atom, N atom, Al atom, P atom, Si atom, Ge atom or Ti atom, or a C1-20 organic group, X represents a hydrolyzable group, and n represents an integer of 0-2, with the proviso that when n is 2, each R 1 may be the same or different, and when n is 0-2, each X may be the same or different), component (b): a solvent capable of dissolving said component (a), component (c): an onium salt, and component (e): a polymer with a side chain containing a hydroxyl group, wherein said polymer satisfies the relationship represented by the following inequality (2): 0< M OH <0.4×10 −2 (2), (wherein M OH represents the concentration (mol/g) of said hydroxyl groups in said polymer).