ABSTRACT
Silicone elastomeric powders, also referred to as silicone powders, are small particles of silicone rubber (elastomer) that are usually on the order of 2-10 μm in size (see Figure 5.1). Silicone powders are used in a number of applications that fall into the major categories of personal care, plastics modification, and coatings modification. Silicone powders can be prepared by several different techniques, such as cryogenic grinding of silicone rubber, atomization of liquid silicone rubber, and an aqueous emulsion process. This chapter will deal with only powders made by the emulsion process. In the emulsion process, reactive, liquid, silicone polymers are first emulsified followed by cross-linking or vulcanization and, finally, removal of
5.5.5 Applications in Skin Care ................................................................. 164 5.5.5.1 Absorption of Liquids and Delivery of Actives ................. 164 5.5.5.2 Absorption of Sebum ......................................................... 165 5.5.5.3 Optical Properties, Soft Focus, and Wrinkle Masking ...... 167
5.5.6 Application in Hair Care .................................................................. 167 5.6 Conclusions ................................................................................................... 169 Acknowledgments .................................................................................................. 169 References .............................................................................................................. 170
water [1,2]. Silicone powders were first prepared by Japanese researchers in the early to mid-1980s, and they became commercially available in the late 1980s [3-6].
