248 parts 2 0 mol and deionized water 1000 parts were charged into a 4 neck flask with flush bottom outlet valves equipped with a thermometer a stirrer and a reflux condenser and the mixture was stirred with heating for dissolving while this solution was stirred thereafter calcium hydroxide 74 parts 1 0 mol was added thereto over a period of ten minutes and after its temperature was raised to 70 90 u00b0 c a neutralization reaction was carried out at this temperature by stirring for one hour after the stirring was stopped it was left quietly for 30 minutes to separate the lower layer portion containing deposited calcium salt of propylsulfonic acid water 500 parts was added to the portion containing the calcium salt of propylsulfonic acid after it was heated to 70 90 u00b0 c and stirred for one hour the stirring was stopped and it was left quietly for three hours at the same temperature after the upper layer of aqueous solution was removed from the top by leaving the lower layer portion it was washed with water a similar washing process with water was repeated once more and calcium salt of propylsulfonic acid 257 parts 0 9 mol was obtained by dehydration and drying this was collected as metal organic sulfonate s 1 metal organic sulfonats s 2 s 35 and t 1 t 3 in table 1 below were synthesized similarly as described above mineral oil a 1 with viscosity at 30 u00b0 c of 3 5 u00d7 10 u2212 5 m 2 s 82 parts and metal organic sulfonate s 1.