Novel Multi-Functional Hybrid Polymer

Abstract

Although W/O emulsions are widely used especially for rich cream formulas, there are some oils such as silicones difficult to incorporate into the system by conventional emulsifiers. Here, we have applied a novel hybrid polymer bearing hydrolyzed silk protein as the hydrophilic group, and both alkyl and silicone moieties as the hydrophobic group for the W/O emulsification of silicone oil. The hybrid polymer gave W/O emulsion with silicone oils or polar-oils relatively easily with long-term stability. W/O sunscreen lotion prepared with the hybrid polymer exhibited supple moisturizing effect while suppressing tackiness (stickiness) and excess oily feeling by sensory evaluation. The skin moisturizing effect was confirmed by in vitro and in vivo test.