aqueous mixture with continuous mixing in a separate vessel the 10 citric acid was stirred into the standamax lao 30 surfactant and the solution was added to the heating aqueous mixture the powdered methyl paraben was then added to the aqueous mixture which was stirred until the preservative was dissolved the mixture was continuously and rapidly agitated and heated to 76 u00b0 c in the water bath in a separate vessel the oil phase was prepared by combining the cerasynt 945 crodacol c 95 nf lipowax d mineral oil finsolv tn generol 122 e 16 and the two other preservatives propyl paraben and butyl paraben the oil phase mixture was heated to 78 u00b0 c with agitation until all the components were melted and a clear hot uniform mixture was achieved the oil phase at 78 u00b0 c was then added to the aqueous phase of the lotion by means of a subsurface addition technique with rapid agitation of the mixture the addition rate of the oil phase into the aqueous phase was at 1 092 grams of the oil phase per second the total time for the addition was 2 5 minutes the resulting emulsion that was formed had a temperature of 76 u00b0 c agitation of the oil in water emulsion was continued and the temperature of the emulsion was maintained at 76 u00b0 c in the.