PREPARATION OF POLYETHYLENE-MINERAL OIL GELS 863 Photomicrographs of composition A (Table I) prepared by the con- ventional and by the high-shear processes are shown in Fig. 2. It is evident that the high shear process yields a finer dispersion of the wax than the conventional process. This results in a sponge-like structure with smaller pore size which probably is responsible for the greater rigidity of the gel prepared by the high shear process. SUMMARY A process for the preparation of polyethylene wax-mineral oil gels using commercially available high shear equipment has been described. The properties of several gels prepared by the high shear method have been compared to gels prepared by the use of conventional mixing equip- ment. This procedure is more adaptable for the preparation of cosmetic and dermatological formulations than previously described methods. ACKNOWLEDGMENT The authors gratefully acknowledge the assistance of Mr. James A. Tassoff and Mr. James H. Skillman in the preparation of photomicro- graphs and õraphs. (Received August 1, 1964) REFERENCES (1) E. R. Squibb & Sons, Plastibase © Bulletin. (2) Foster, S., Wurster, D. E., Higuchi, T., and Busse, L. W., J. Am. ?harm. Assoc., Sci. Ed.• 40, 123 (1951) (3) U.S. Pat. 2,627,938, Feb. 10, 1953. (4) U.S. Pat. 2,628,187, Feb. 10, 1953. (5) Mutimer, M. N., Riffkin, C., Hill, J. A., Glickman, M. E., and Cyr, G. N., J. Am. ?harm. Assoc., Sci. Ed., 45,212 (1956). (6) Mutimer, M. N., Riffkin, C., Hill, J. A., and Cyr, G. N., Ibid., 45, 101 (1956).

364 JOURNAL OF THE SOCIETY OF COSMETIC CHEMISTS International Federation of Societies of Cosmetic Chemists The Fourth Congress of the I. F. S.C. C. will take place in Paris in June, 1966. The "Soci6t6 Francaise de Cosmetologie" has created a scientific Committee consisting of: Dr. Ir. Velon Ir. Jean Morelle Dr. Coilin This Committee wishes to receive conference papers before January 31, 1966. Each paper can be typed in the original language of the speaker. The French Committee will take care of the translation in English, French and German. General Secretary Dr. P. A.M. E. van Velzen Scheveningseweg 62 The Hague, The Netherlands