Effect of Coacervate of the Cationic Polymer and Surfactant on the Adhesion of Fragrance on the Hair

The anionic surfactant, which is the main component of shampoo, interacts with the cationic polymer to form a water insoluble complex called coacervate in a certain concentration region upon shampoo dilution. It is known that coacervate adheres to hair and imparts a conditioning effect, and it has been reported that the properties of coacervate influence the feeling of use of shampoo. Fragrances are used in shampoo, and the aroma when using shampoo and the substantivity of fragrances on the hair are important. Since coacervate adheres to the hair, it is considered that the aroma when using shampoo and the substantivity of fragrances on the hair are affected by coacervate. In this study, we investigated that the effect of coacervate on the adhesion of fragrance on the hair. As a result of comparing the amount of fragrance in the supernatant part of shampoo solutions with/without coacervate, it is clear that the fragrance tended to be incorporated into the coacervate. The amount of fragrance adhering to the shampooed hair using a shampoo solution with/without coacervate was determined by gas chromatography; it is confirmed that the amount of fragrance on the hair shows more increase with coacervate than without it. It is considered that the fragrance is taken in together with coacervate and adheres to the hair.