Patent ID: 7309722

Claim:
A composition for forming a porous film comprising: an amorphous polymer solution obtained by hydrolyzing and condensing at least one silane compound expressed by formula (1): (R 1 ) n Si(OR 2 ) 4−n (1) wherein R 1 represents a straight-chain or branched alkyl group or aryl group having 1 to 8 carbons, which can have a substituent, and when there is more than one R 1 , the R 1 s can be independent and the same as or different from each other; R 2 represents an alkyl group having 1 to 4 carbons, and when there is more than one R 2 , the R 2 s can be independent and the same as or different from each other; and n is an integer of 0 to 3; and a zeolite sol formed by a method comprising: hydrolyzing, in the presence of a quaternary ammonium hydroxide, a silane compound expressed by formula (2); Si(OR 3 ) 4 (2) wherein R 3 represents a straight-chain or branched alkyl group having 1 to 4 carbons, and can be independent and the same as or different than each other; and heating said silane compound after hydrolyzing said silane compound, and wherein said composition is suitable for coating.