F(CF2)m(CH2)nSiRqX3???q???(A) wherein m represents an integer ranging from 1 to 15, n represents an integer ranging from 0 to 15, the sum of m and n ranges from 10 to 30, q represents an integer ranging from 0 to 2, R represents an alkyl or an alkoxyl group, and X is a halogen atom or an alkoxyl group, or of the formula: F(CF2)m???(CH2)n???A(CH2)pSiRqX3???q???(B) wherein m??? represents an integer