EMULSION STABILITY 805 3.0 z O n,,, 2.0 TWEEN 80 I N OIL TWEEN 80IN WATER 1.0 0 i I I I I t I I I I I 0 20 40 60 8o 100 120 EMUSIFICATION TIME (MIN) Figure 5. Change of mean volume diameter, d .... of emulsion droplets with mixing time during emulsification (mineral oil system) --- 3.0 I,/3 Z O n," •: 2.0 1.0 TWEEN 80 IN OIL '11,NEEN 80 IN WATER 0 i I I I I I I I I I I 0 20 40 60 60 100 120 EMULSIFICATION TIME (MIN) Figure 6. Change of mean volume diameter, d,•, of emulsion droplets with mixing time during emulsification (isopropyl myristate)
806 JOURNAL OF THE SOCIETY OF COSMETIC CHEMISTS 6.0 E -O- TWEEN 80 IN OIL TWEE N 80 I N WATER /+.0 0 20 /+0 6O 8O 100 120 EMULSIFICATION TIME ( MIN ) Figure 7. Change of mean volume diameter, d=, of emulsion droplets with mixing time during emulsification (castor oil system) 2O mlo TWEEN 80 IN OIL TWEEN 80 IN WATER EMULSIFICATION TIME (MIN•) Figure 8. Effect of emulsification time on stability of mineral oil emulsion (% separation after 116 days) o o 20 40 60 80 lOO 12o
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