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J. Soc. Cosmetic Chemists, 17, 157-169 (1966) Surface Modifying Effects Lanolin Derivatives of LESTER I. CONRAD, B.S., HENRY F. MASO, B.S. and SHIRLEY A. DERAGON, B.S.* Presented March 1 O, 1965, A ustralian Society of Cosmetic Chemists, Sydney Synopsis--The influence of lanolin derivatives on the physical aspects of dispersions is dis- cussed. Particular reference is made to pigment wetting, rheological patterns in emulsion systems, solubilization, emulsification and spreading coefficients. Practical applications of these phenomena are illustrated by typical cosmetic formulations. INTRODUCTION This presentation is concerned primarily with the influence of lanolin derivatives on the physical aspects of dispersions. Lanolin is known to contain many chemical groups and configurations which are potentially surface-active. However, due to the manner in which these groups are chemically bound, they cannot achieve that potential. As a result, lanolin itself is relatively poor when considered from the view- point of surface activity. Fortunately, by means of chemical and phys- ical procedures lanolin can be converted into very useful functional deriv- atives of predictable surface activity. Whereas formerly lanolin was employed mostly for the marketing advantages of having "Contains Lanolin" on the label, derivatives of lanolin are now widely used for their ability to modify the surfaces of dispersed systems as well as for emollient effects on the skin. * American Cholesterol Products, Inc., Edison, N. J. 157