R3 is a substituted or unsubstituted monovalent hydrocarbon radical, Z is an oxygen atom or divalent hydrocarbon radical, at least one Z being an oxygen atom, and letters d, e, and f are positive numbers in the range: 0<d???2, 0???e, 0<f???1 and d+e+f???3.0, containing at least two hydrogen atoms each bonded to a silicon atom in a molecule, the monovalent organic radical having an aromatic ring c