Patent ID: 8188024

Claim:
A surfactant composition comprising the following components (A), (B) and (C), wherein a content of the component (A) is more than 50 wt. % and not more than 65 wt. %: (A) a sulfate surfactant represented by the following general formula (1): R 1 O—(PO) m (EO) n SO 3 M (1) wherein R 1 represents a saturated or unsaturated hydrocarbon group having 8 to 18 carbon atoms; PO represents a propyleneoxy group; EO represents an ethyleneoxy group; m and n represent an average mole number of added PO and EO, respectively, are the same as or different from each other, and independently represent a number within the ranges of 0.1<m<0.9 and 0.5<n<4.0; and M represents a cation; (B) one or more of compound(s) selected from the group consisting of the following (B-1) and (B-2): (B-1) an alkylene oxide adduct of alcohol represented by the following general formula (2): R 2 O—(AO) t —R 3 (2) wherein R 2 represents a linear or branched alkyl or alkenyl group having 8 to 10 carbon atoms; AO represents an alkyleneoxy group having 2 to 4 carbon atoms; t represents an average mole number of added AO and represents a number of 0.5 to 4.0; and R 3 represents a hydrogen atom or a methyl group; (B-2) a monoalkyl having 6 to 18 carbon atoms or monoalkenyl having 6 to 18 carbon atoms glyceryl ether; and (C) a water-soluble salt selected from the group consisting of sodium chloride, sodium sulfate, sodium carbonate, trisodium citrate, ammonium chloride, ammonium sulfate, and ammonium nitrate; wherein a weight ratio of the components (A) to the components (B), (A)/(B), is 99/1 to 75/25, and a weight ratio of the component (A) to the component (C), (A)/(C), is 99/1 to 85/15.