Hydroxy Acid Hair Cleansing Composition for Lasting Clean, Less Irritation

The patent changes the chemical parameters of the cleansing system by replacing traditional surfactant-based formulations with a hydroxy acid-based system. Specifically, it uses alpha-hydroxy acids (glycolic acid, lactic acid, citric acid) and beta-hydroxy acids (salicylic acid) at controlled concentrations (0.1-10% and 0.1-5% respectively) to achieve cleansing effects without the irritation caused by high surfactant amounts. This parameter change fundamentally alters the mechanism of action from surfactant-mediated emulsification to hydroxy acid-mediated dissolution and exfoliation.

The patent converts the potentially harmful high surfactant content into a beneficial low-surfactant formulation by utilizing hydroxy acids as the primary cleansing agents. The hydroxy acids naturally occur in the skin and provide gentle exfoliation and cleansing benefits while maintaining scalp health. This approach transforms the problem of surfactant-induced irritation into an opportunity to use milder, more compatible ingredients that still deliver effective long-lasting clean performance.

The patent applies preliminary action by using hydroxy acids to exfoliate and prepare the scalp surface before the actual cleansing process. The hydroxy acids work to dissolve sebum, remove dead skin cells, and unclog pores during the exposure period (1-5 minutes), creating a cleaner base that enhances the subsequent rinsing effect. This preliminary chemical exfoliation and sebum dissolution action ensures that the cleansing function is more effective and the clean effect lasts longer between washes.

The patent achieves continuity of useful action through the sustained presence of hydroxy acids on the scalp during the exposure period. Unlike traditional shampoos that are rinsed off immediately, the hydroxy acid composition is designed to remain on the scalp for 1-5 minutes, continuously acting to dissolve sebum and exfoliate dead cells throughout this period. This extended contact time ensures thorough cleansing and contributes to the long-lasting clean effect observed between washes.