Abstract
Betaines were prepared from amides of N, N-dimethy1-1, 3-propanediamine and lauric acidor hardened coconut oil fatty acids. The viscosity of a shampoo frame formulation containing only betaine and sodium dodecyldi (oxyethylene) sulfate (SDES) as surfactants was found to increase 2000 mPa·s with the addition of 0.06 % lauric acid. Increase in viscosity was proportional to fatty acids added. A determining facter of viscosity was found to be component fatty acid in the range such as that for the present betaine preparation.
