Patent ID: 7569231

Claim:
A method for improving storage stability of an oil-based thickening gel composition, comprising adding (c) a tocopherol compound to an oil-based thickening gel composition comprising (a) an anionic surfactant having a lipopeptide structure, (b) water and/or a polyhydric alcohol having a valence of 3 or more and (d) from 30 to 99% by mass of an oil component being one or more selected from polyoxyethyleneglyceryl ether fatty acid esters and polyoxyethylene sorbitol ether fatty acid esters, and wherein (a) the anionic surfactant having a lipopeptide structure is surfactin represented by the following formula (1) and/or salts thereof, wherein R is isoalkyl group having 11 carbon atoms, X is leucine, the polyhydric alcohol is water and glycerin, the tocopherol compound is δ-tocopherol and the oil component is polyoxyethylene (20) glyceryl triiostearate and glycerin tri-2-ethylhexanoate, and wherein the storage stability comprises preventing separation of the composition.