Development of New Cationic Surfactant "AG" and application for Hair Conditioners.

Novel amino acid‐based surfactant for silicone emulsification and its application in hair care products: a promising alternative to quaternary ammonium cationic surfactants

“…Mitamura et al . , reported that the hydrophobic interaction between ACS and hair surfaces is more valid than electrostatic interaction by steric shielding of three alkyl groups of ACS which cationic charge is in a quaternized nitrogen. It was suggested that ACS‐stabilized emulsion easily adsorbed to the Healthy Hair surface, which is coated with 18‐methyleicosanoic acid (the F‐layer), making it hydrophobic .…”

Effects of dioctadecyl dimethyl ammonium chloride on the rheological behavior of behenyl trimethyl ammonium chloride/1-hexadecanol/water ternary system

“…The phase behavior and structures have been extensively studied in connection with rheological and electrical properties [4][5][6][7]. In application to hair conditioner and hair treatment products, the typical formations have been established by the use of single-chain cationic surfactants in aqueous solutions of long-chain alcohols [8][9][10]. The cationic surfactants are essential ingredients which are adsorbed on the hair surfaces to increase the flexibility of single fibers and reduce the friction between fibers [11].…”

Interaction of Guanidine-type Surfactants with Biological Substances

“…Dodecylguanidine acetate salt has been used as an antibacterial agent for plants 10) , and N-acylarginine ethylester acetate salts display antibacterial activity 11) . While guanidine groups strongly affect the physiological activity of surfactants, hair conditioner containing LAG has been found to be safe for human use 4) . Therefore, it is important to elucidate the relationship between the molecular structure of LAG and its safety.…”

“…Among many amino acid-type surfactants, cationic lauroylamidebutylguanidine acetate (LAG), which adsorbs well to hair, has been developed and applied in hair conditioners 4,5) . Guanidine groups interact strongly with biological substances 6,7) , and guanidine hydrochloride salts have been reported to be highly irritative 8) .…”

“…Guanidine-type surfactants were synthesised by reacting amines with cyanamide as reported earlier 4) . n-Dodecylamine and dodecanoylamide alkylamine, which were synthesised from methyl laurate and diaminoalkane, respectively, were reacted with cyanamide in the presence of acetic acid to yield C 12 A 0 G and C 12 A m G (m = 2, 3, 4, 6) as acetate salts.…”