COMPLEX FORMATION IN AEROSOLS 829 or Freon-114. Freon-12/Freon-11 (51)/30), Propellant 142b, and Pro- pellant 132a gave less stable foams. The latter two propellants gave foams with the lowest density. Triethanolamine-fatty acid systems with an excess of fatty acid were investigated to a limited extent. The data indicate that fatty acids also form complexes with the triethanolamine salts. The results of the present study show that molecular complex for- marion can vary the properties of aerosol emulsions and foams over a wide range. These data were obtained with simple aerosol systems. The extent to which the present findings can be applied to modify the properties of practical aerosol products remains to be determined. Possible applications include the formulation of more heat stable foams, resulting from a potentially higher film drainage temperature with the foams containing molecular complexcs, and the preparation of aerosol emulsion systems with powder suspensions. The increased viscosity of the aerosol emulsion systems with molecular complexes might retard set fling and agglomeration of the powder sufficiently so that a practical product could be obtained. (Received March 29, 1966) REFERENCES (1) Schulman, J. H., and Rideal, E. K., Proc. Roy. Soc., 122B, 29, 46 (1937). (2) Schulman, J. H., and Stenhagen, F., Proc. Roy. Soc., 126B, 356 (1938). (3) Schulman, J. H., and Cockbain, E.G., Trans. Far. Soc., 36, $1 (1940). (4) Miles, G. D., Shedlovsky, L., and Ross, J., J. Phys. Chem., 49, 93 (1945). ($) Miles, G. D., Ross, J., and Shedlovsky, J., J. Am. Oil Chemists' Soc., 27,268 (July, 1950). (6) Epstein, M. B., Ross, J., and Jakob, W. C. W., J. Colloid Sci., 9, 50 (1954). (7) Becher, P., and Del Vecchio, A. H., J. Phys. Chem., 68, 3511 (December, 1964). (8) Epstein, M. B., Wilson, A., Jakob, W. C. W., Conroy, L. E., and Ross, J., J. JPhys. Chem., 58, 60 (1954). (9) Kung, H. C., and Goddard, E. D., J. Phys. Chem., 67, 1965 (1963). (10) Kung, H. C., and Goddard, E. D., J. Colloid Sci., 20, 766 (September, 1965). (11) Ryer, F. V., Oil and Soap, 23,310 (1946). (12) John, L. M., and McBain, J. W., J. Am. Oil Chemists' Soc., 25, 141 (1948). (13) Reed, F. T., Chemical Specialties Manufacturers' Association, Proc. 39th Annual Meet- ing, p. 32 (December 1952). (14) Foresman, R. A., Ibid., p. 35. (15) Carter, P., and Truax, H. M., Proc. Sci. Sect. Toilet Goods Assoc., 35, 37 (May, 1961). (16) "Freon" Aerosol Report, FA-21, Aerosol Emulsions with the "Freon" Propellants, E. I. du Pont de Nemours & Co. (17) Sanders, P. A., J. Soc. Cosmetic Chemists, 9, 274 (September 1958). Also available as "Freon" Aerosol Report, A-49, E. I. du Pont de Nemours & Co. (18) Sanders, P. A., Aerosol Age, 5, No. 11, 33 (November 1960). Also available as "Freon" Aerosol Report, A-53, E. I. du Pont de Nemours & Co.

830 JOURNAL OF THE SOCIETY OF COSMETIC CHEMISTS (19) (20) (21) (22) (23) (24) (25) (26) Id., Ibid., 8, No. 7, 33 (July, 1963). Also available as "Freon" Aerosol Report, A-58, E. I. du Pont de Nemours & Co. "Freon" Aerosol Report, A-59, ,4 queous Alcohol Aerosol Fortms, E. I. du Pont de Nemours & Co. Sanders, P. A., Soap and Chem. Specialties, 39, No. 9, 63 (September, 1963). Also available as "Freon" Aerosol Report, A-60, E. I. du Pont de Nemours & Co. Sanders, P. A., Am. Perfumer, 81, 31 (February, 1966). Also available as "Freon" Aerosol Report, A-62, E. I. du Pont de Nemours & Co. Sumner, C. G., Clayton's, The Theory of Emulsions and Their Technical Treatment, 5th Edition, p. 497, The Blakiston Co., Inc., New York (1954). Schwartz, A. J., Perry, J. W., and Berch, J., Surface Active Agents and Detergents, Vol. II, p. 474, Interscience Publishers, Inc., New York (1958). Becher, P., Emulsions: Theory and Practice, 2nd Edition, p. 151, Reinhold Publishing Corp., New York (1965). Bikerman, J. J., Foams: Theory and Industrial Applications, Chapter 4, Reinhold Publishing Corp., New York (1953).