NOVEL COSMETIC EMULSIONS AND EMULSIFIERS EXHIBITING DILATANT RHEOLOGICAL PROPERTIES

摘要

The use of novel nonionic polymeric thickeners that produce cosmeticallyuseful emulsions of an oil phase and a water phase is described. Thethickeners of choice are the urethane dimers of ethoxylated fatty alcohols.These materials were not anticipated to have emulsifying properties. Also, ithas been found that the esters of ethoxylated polyols show similar emulsifyingbehavior, although their uses are limited by their inherent susceptibilitytowards hydrolysis. Further, many of the emulsions produced with theseemulsifiers have a dilatant or shear thickening rheology that is unusual andhas unique cosmetic applications. In addition, it is possible to produce highinternal phase oil-in-water emulsions, with oil phase concentrations greaterthan 70%, using these emulsifiers. Finally, many of the emulsions, especiallythe high internal phase ones, have a characteristic "ring" or vibration thatis apparent when their container is tapped. This is a characteristic of socalled "microemulsions" that has not been observed in conventional appearing,white (albeit dilatant) emulsions.