OIL DEPOSITION ON SKIN 617 corded from aqueous dispersions of di-isopropyl sebacate (Fig. 2d). However, the amount of di-isopropyl sebacate deposited on skin appears to be the least with the highest spreading coefficient value obtained in this series. A relationship between spreading coefficient and the amount of oil deposited on the skin was recorded for triglyceride and the polyol Table V I Effect of Concentration of Various Surfactants on Spreading Coefficient of Mineral Oil (Technical) Type and Concentration Surface Tension Interfacial (%) of Surfactant in of Oil (dynes/ Tension Spreading Mineral Oil cm) at 25øC at 25øC Coefficient Polyethylene Glycol 400 Dilaurate 0 31.4 41.5 0 4 31.4 0.8 42.9 8 30.9 1.2 42.8 Polyethylene Glycol 400 Dioleatc 0 31.4 41.5 0 4 30.1 1.8 42.0 8 28.8 1.0 42.3 Polyoxyethylene (5) Tallow Amine 0 31.4 41.5 0 4 30.9 1.0 42.9 8 31.8 0.8 42.4 Polyoxyethylcne (5) Soybean Amine 0 31.4 41.5 0 4 31.2 1.3 42.5 8 30.9 1.0 42.8 esters of fatty acids. In both series, with increasing spreading coef- ficient values there appears to be an increase in the amount and cover- age of the oil film deposited after immersion in an oil bath. Hexadecyl alcohol demonstrates good deposition on skin after im- mersion in aqueous dispersion and a substantial spreading coefficient value. However, the coverage of the deposited film on the skin ap- pears to be inadequate when compared to the film deposited by esters of similar spreading coefficient values. The affinity to skin of three lanolin derivatives in aqueous dispersions is recorded in Table III. A relationship appears to exist between the spreading coefficient values obtained for two lanolin derivatives (A and B) and the amount of oil deposited on the skin. However, lanolin

JOURNAL OF TItE SOCIETV OF COSMI, TIC CIIEMISTS Figure .•a. 4c,•, Polyethylene glycol 40{} dilaurate in mineral oil Figure 3b 8% Polyethylcne glycol 400 dilaurate in mineral oil Figure 3c. 4% Polyethylene glycol 400 dioleate in mineral oil - ..½{•,.... Figure 8e. 4c• Polyoxyethylene (8) tallow amine in mineral oil Figure 3d. 8% Polyethylene glycol 400 dioleate in mineral oil F, gure 3f. 8% Polyoxyethylene (5) tallmv amine in mineral oil