NEW SOFT CAPSULE 243 Figure 2. (a) Optical photomicrograph of microcapsule. (b) Cryo-scanning electron microscopy of micro- capsule.

244 JOURNAL OF COSMETIC SCIENCE 250 200 100 0 1000 2000 3000 4000 5000 6000 Stirring spccd I rpm Figure 3. Effect of stirring speed on the mean diameter of microcapsules. Stirring speed was 1000-5000 rpm. Preparation temperature was 70øC. Composition (see Table I) was uniform for each condition. 450 400 350 3OO 25O 200 150 lOO 0 100 200 300 400 500 Stirring speed I rpm Figure 4. Effect of stirring speed on the mean diameter of microcapsules. Stirring speed was 100400 rpm. Temperature was 70øC. Composition (see Table I) was uniform for each condition. average particle diameters and the process temperatures. With the low stirring speed (250 rpm), the average diameter of microcapsules also decreased with the increasing process temperature. The range of the diameters was approximately 300-400 Fm.