Patent ID: 7964659

Claim:
An antireflection coating composition which contains a fluorinated surfactant (A) containing a compound (A1) represented by the following formula (I), a water-soluble polymer (B) and an aqueous medium (C): R 1 —O—(R 2 —O) n —R 3 —X 1 (I) wherein R 1 is a linear or branched perfluoroalkyl group of which the terminal fluorine atom may be substituted by a hydrogen atom or a chlorine atom, each of R 2 and R 3 which are independent of each other, is a linear or branched perfluoroalkylene group, provided that the total number of carbon atoms in R 1 , R 2 and R 3 is at most 5, n is 0 or an integer of at least 1, X 1 is —COOH or —C(CF 2 Z 1 )(CF 2 Z 2 )OH, which may form a salt, and each of Z 1 and Z 2 is a hydrogen atom, a fluorine atom, a chlorine atom or a trifluoromethyl group.