| 摘要 |
Stability of compositions comprising relatively low levels (0.5-15 % wt) of peroxycarboxylic acids can be improved by formulation such that the pH of the composition is such that it is above the pKa of the corresponding imido acid and below 6.0. Stability can be further improved by the use of a secondary alkane sulphonate surfactant and by the use of a sulphate salt other than a transition metal sulphate. Stability can be yet further improved by selection of a specific ratio of the quantity of surfactant to said sulphate such that the ratio is in the range 0.4-0.8:1, more preferably 0.6-0.8:1, as surfactant: sulphate (both being expressed as sodium salts). |
