662 JOURNAL OF THE SOCIETY OF COSMETIC CHEMISTS II II II II II II I I I I I I I I I I I I I I I I m m ß ENCAPSULATED OIL , OIL Illll! RELATIVE WATER VAPOR 2 3 4 5 6 7 B TIME HOURS Figure 5. Perspiration-induced fragrance release Table III Modification of Antiperspirant Bases Concentrate Formulasa 1 2 3 4 Isopropyl myristate a Robaneb Mineral oil c Polylan a Cab-O-Sil* Aluminum chlorhydrate• •)-CAP perfume/ Fill Concentrate Propellants (50: 50) 55.5 27.7 27.7 27.7 ß.. 27.7 ...... ...... 27.7 . .. ......... 27.7 3.6 3.6 3.6 3.6 31.8 31.8 31.8 31.8 9.1 9.1 9.1 9.1 11.0 89.0 a Wickhen Products, Inc., Huguenot, N.Y. b Robeco Chemicals, Inc., New York, N.Y. (hydrogenated squalene). c Witco Chemical Co., New York, N.Y. a American Cholesterol Products, Inc., Edison, N.J. (polyunsaturated liquid esters). e Cabot Corporation, Boston, Mass. (coloidal silicone dioxide). / Registered trademark of Polak's Frutal Works, Inc., Middletown, N.Y. g Formula No. I was the control as used in all of the testing. Formulas No. 2, 3, and 4 are 50% replacements of the IPM with the various nonpolar materials.

ENCAPSULATED PERFUMES 663 10 • 4 I o o _ • 2 I _J 1 !l •i '-I I i i I i , • i ii i ! ii ii Ii ii ii Ii Ii Ii Ii Ii [ ii i i ii " i ii I II I II '. I I I I I ROBANE IIIIIIII ISOPROPYL MYRISTATE .......... POLYLAN __ MINERAL OIL lO 9 i i i I i i 4 6 12 16 20 24 28 32 36 TIME HOURS Figure 6. Fragrance release as oeunction of polarity of vehicle 4 5 6 7 8 9 10 TIME HOURS Figure 7. Fragrance release in absence of vehicle A test was run using encapsulated perfume only to show the effect ot• the absence of nonpolar vehicles, such as IPM. The results are shown in Fig. 7. The contrast between Figs. 6 and 7 indicates that the nature ot• the aerosol vehicle accounts for the perfume release characteristic of the