Abstract
A peptide/silicone hybrid functional polymer composed of silk peptide and silicone resin with a hydrophobic alkyl group was investigated for its compatibility and functionality as a cosmetic ingredient. We have found this polymer provides characteristic functions to modify and control various interfacial properties and named it Active Interfacial Modifier (AIM-FN). At the liquid/liquid interface, AIM-FN worked as an excellent W/O emulsifier for various oils, polar or non-polar, and even for silicone oil. In principle AIM-FN stays at the interface between the aqueous phase and lipid phase because it isn't compatible with either phase. At liquid/solid interfaces, the peptide moiety of AIM-FN attaches to the hydrophilic solid surface and makes it water repellant and water proof with its hydrophobic silicone and alkyl residue. An emulsion formulated with AIM-FN gives a non-oily and non-tacky skin feeling as AIM-FN improves the solid/solid (skin/skin) surface property.
