Patent ID: 7671000

Claim:
A personal liquid cleanser composition comprising: (a) 1 to 50% by wt of fatty acyl isethionate surfactant product which surfactant product comprises about 30 to 90% alkali metal fatty acid isethionates and about 10 to 55% free fatty acid and/or fatty acid salt; (b) 1 to 30% by wt. of a co-surfactant selected from the group consisting of anionic, nonionic, amphoteric, zwitterionic synthetic surfactants and mixture of above; (c) 0.5 to 10% by wt. of alkanolamide selected from the group consisting of mono-and di-ethanolamides, N-methyl-monoethanolamide, isopropanolamides of fatty acids having about 10 to 20 carbon atoms, and PPG-hydroxyethyl cocamides wherein the amount of said alkanolamide is ≧15 wt % of total amount of fatty acyl isethionate of item a and co-surfactant of item b; (d) 1 to 10 wt % of a molecule selected from the group consisting of straight chain fatty acids, straight chain fatty alcohols or aliphatic hydrocarbon oils and mixtures thereof; wherein the total amount of straight chain fatty acids including fatty acid/fatty soap of item a, straight chain fatty alcohols and aliphatic hydrocarbon oils are used at a level of at least 10% of fatty acyl isethionates and synthetic co-surfactants (b) in combination, wherein said liquid cleansing composition contains some portion in a liquid crystalline-phase, as recognized by characteristic patterns observed via optical microscopy or x-ray diffraction; wherein the final composition has a thermal trace in a differential scanning colorimetry (DSC) experiment such that more than 50% of the transition enthalpy measured between 5 and 60° C. occurs in the window from 5 to 35° C.; and wherein the composition is stable at 40° C. for at least 2 weeks; wherein said thermal trace and said stability confirm that sufficient components (c) and (d) have been added to induce formation of sufficient liquid crystalline vesicles having size less than 5 microns.