PROBLEM TO BE SOLVED: To provide a method for improving the low-temperature stability of an aqueous solution containing a long-chain acyliminodiacetic acid compound, and to provide a method for further improving the high-temperature stability, viscosity-improving property and use feeling.SOLUTION: There is provided a method for blending the aqueous solution containing a long-chain acyliminodiacetic acid compound and an N-acyl-N-alkyl neutral amino acid compound and/or an N-acyl-N-alkyltaurine compound in a compounding ratio by weight of 8/2 to 2/8. Further, there is provided a method for involving an amphoteric surfactant and/or bipolar surfactant and/or semipolar surfactant therein.COPYRIGHT: (C)2012,JPO&INPIT【課題】長鎖アシルイミノジ酢酸化合物を含む水溶液の低温安定性を改善し、さらに高温安定性、粘度到達性、使用感を改善する方法の提供。【解決手段】長鎖アシルイミノジ酢酸化合物含有水溶液とN-アシル-N-アルキル中性アミノ酸化合物及び/又はN-アシル-N-アルキルタウリン化合物とを、配合重量比8/2~2/8で混合する方法。さらに両性界面活性剤及び/又は双極性界面活性剤及び/又は半極性界面活性剤を含有させる方法。【選択図】なし
