Patent ID: 7141305

Claim:
A water-repellent film that is formed on a solid substrate, comprising: a molecule (A) —OSi(R 1 R 2 )(CH 2 ) n Si(R 1 R 2 )O— comprising at least one or more of siloxane bonding (—Si—O—) at both ends and a hydrocarbon chain in a middle part, (where R 1 and R 2 are a methyl group, an ethyl group, a methoxy group(—OCH 3 ), an ethoxy group (—OC 2 H 5 ), a hydroxyl group (—OH), or oxygen constituting siloxane bonding, and n is a natural number from 1 to 10) or a molecule (A) and comprising at least one or more of siloxane bonding (—Si—O—) at both ends and a benzene ring in a middle part; and a molecule (B) comprising a fluorocarbon chain at one end and at least one or more of siloxane bonding (—Si—O—) at another end, wherein a polymer film is formed at least with the molecule (A) and the molecule (B), wherein a ratio of the molecule (B) to the molecule (A) is in the ranue from 0.001 to 0.2 (the amount of molecule (B)/the amount of molecule (A)) as represented by a mol ratio.