methanol again the reaction mixture was stirred at room temperature for 1 hour and the resulting homogeneous dispersion was filtered to remove the unreacted content which dissolves in methanol the content in the form of cake which failed to dissolve in the methanol was added to a mixed solvent of 200 g of methanol and 300 g of ion exchanged water and the mixture was stirred for 1 hour with cooling in an ice water the resulting homogeneous dispersion was filtered to remove the remaining ionic impurities the resulting product in the form of a cake was washed with acetone and then dried at 100 u00b0 c for 5 hours at a reduced pressure of 10 torr to remove the remaining acetone and water the resulting product was pulverized in a mortar to obtain 128 g of a fine white powder the thus obtained silicone compound 1 has a theoretical structure such that content of the phenyl group in relation to all organic groups bonded to the silicon atom in the molecule is 50 by mole content of the potassium sulfonate salt group bonded to the silicon atom by the intervening propyl group in relation to all organic groups bonded to the silicon atom in the molecule is 21 4 by.