460 JOURNAL OF THE SOCIETY OF COSMETIC CHEMISTS z 3 , O-- MEAN DROPLET SIZE i m /X SOLUBILI ZATION LIMIT (5) 7.5) lO) 18) 20) 30 0 ' ' , (...__•) m m I m m , 0 0 2 0 4 0 60 80 100 o o m o z WEIGHT % ETHYLENE OXIDE IN 5URFACTANT Figure 1. Solubilization-emulsion droplet size correlation for single surfactant systems. (Emulsion contain 30 per cent mineral oil, 65 per cent deionized water, and 5 per cent polyoxyethylene nonylphenyl ethers with per cent ethylene oxide corresponding to abscissa. Number in parenthesis indicates actual mole number of E. O. in each surfactant)

OPTIMUM O/W EMULSIFICATION 461 o 3 6 z c::) • N 2 Z, • z I-- C:) m,m N 3 O --) z o 1 2 ,,, O-- MEAN DROPLET SIZE •,----- 5OLUBILIZATION LIMIT 0 0 0 .2 .• .6 .8 1 POE (2) POE ( ? ) OLEYL ETHER OLEYL ETHER WEIGHT FRACTION OF HYDROPHILIC 5URFACTANT Figure 2. Solubilization-emulsion droplet size correlation for binary surfactant systems. (Emulsions contain 30 per cent mineral oil, 65 per cent aleionized water, and 5 per cent nonionic surfactant mixtures. Surfactant mixtures consist of hydrophilic POE (7) oleyl ether and lipophilic POE (2) oleyl ether at ratios indicated by abscissa)

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