Patent ID: 7939590

Claim:
A composition for forming a silica-based coating film, comprising a siloxane polymer and an alkali metal compound, wherein said siloxane polymer is at least one hydrolysis-condensation product of a compound represented by a general formula (1) shown below: R n SiX 4-n (1) (wherein, R represents an organic group of 1 to 20 carbon atoms, X represents an alkoxy group of 1 to 5 carbon atoms, n represents an integer from 0 to 2, a plurality of R groups may be either identical or different, and a plurality of X groups may be either identical or different), wherein said alkali metal compound is selected from the group consisting of alkoxides, halides, acetates and nitrates of sodium, lithium, potassium, rubidium and cesium, and wherein the quantity of said alkali metal compound is within a range from 0.03 to 1 wt % relative to said siloxane polymer in terms of the solid fraction calculated as an equivalent weight of SiO 2 .