Patent ID: 7981471

Claim:
A process for producing a thin film, comprising: subjecting a water repellent solution to a vacuum deposition method to form the thin film, the water repellent solution being a mixture of (a) a water repellent having a perfluoroalkyl group, (b) a mixture of an aminopropyltrialkoxysilane, an epoxy-modified silicone oil introduced with an epoxy group into its side chain and/or both terminal ends, and a perfluoroether compound selected from the group consisting of perfluorobutyl ether, methyl perfluorobutyl ether, butyl perfluoromethyl ether and propyl perfluoroethyl ether, and (c) at least one conductive substance selected from the group consisting of fullerenes, carbon nanotubes and graphite compounds respectively having a particle size of 80 μm or less; wherein, a content of (b) in the water repellent solution is in the range of 18.5 to 50% by weight on the basis of the total weight of (a), (b) and (c), a weight ratio of (b) to (a) is in the range of 0.7 to 1.1, a weight ratio of the aminopropyltrialkoxysilane and the epoxy-modified silicone oil is in the range of 1:3 to 3:1, and an amount of the perfluoroether compound is in the range of 0.1 to 0.8 part by weight per 1 part by weight of the sum of the aminopropyltrialkoxysilane and the epoxy-modified silicone oil.