e following general formula (II). [Chemical formula 1] CH2=C(???X)???C(???O)???Y???[???(CH2)m-Z-]p-(CH2)n-Rf (I) wherein X is a hydrogen atom, a methyl group, a fluorine atom, a chlorine atom, a bromine atom, an iodine atom, a CFX1X2 in which X1 and X2 are a hydrogen atom, a fluorine atom or a chlorine atom, a cyano group, a straight-chain or branched-chain fluoroalkyl group having 1 to 20 carbon