Patent ID: 8017570

Claim:
A liquid detergent composition, comprising: at least about 25 weight percent of an α-sulfofatty acid methyl ester; and at least about 10 weight percent of a hydrotrope selected from the group consisting of a lower molecular weight alkanol, glycols, ethyl benzene sulfonate, an ammonium salt of toluene sulfonate, a potassium salt of toluene sulfonate, a sodium salt of toluene sulfonate, an ammonium salt of xylene sulfonate, a potassium salt of xylene sulfonate, a sodium salt of xylene sulfonate, an ammonium salt of cumene sulfonate, a potassium salt of cumene sulfonate, and a sodium salt of cumene sulfonate; wherein the hydrotrope reduces pH drift of the composition and protects the α-sulfofatty acid methyl ester from more than a minor amount of di-salt formation; and wherein the composition has less than about 1 weight percent of an anionic surfactant other than an α-sulfofatty acid ester.