Patent ID: 7655607
Filing Date: 2010-02-02
Classification: A61K,A61Q

Abstract:
1. Method of providing stability for personal liquid cleanser composition comprising a broad selection of fatty acid isethionate surfactants which method comprises mixing components comprising: (a) 1 to 30% by wt of fatty acyl isethionates; (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 items a and b; and (d) 0.5 to 14 wt % of straight chain fatty acids; or mixture of straight chain fatty acids with straight chain fatty alcohols and/or aliphatic hydrocarbon oils wherein said straight chain fatty acid with a chain length of C wherein total amount of straight chain fatty acids, straight chain fatty alcohols and aliphatic hydrocarbon is oils used at a level of at least 10% of fatty acyl isethionates (a) and synthetic co-surfactants (b) in combination wherein said liquid cleansing composition contains 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 of components (c) and (d) have been added to induce formation of sufficient liquid crystalline vesicles having size less than 5 microns.