| 摘要 |
A process for bleaching or disinfecting a substrate comprising the steps of: (a) reacting in aqueous solution, at an initial pH below 8, or pKa' if pKa' is lower than 8, at least one bleach activator, which is a reactive acyl group donor, with a source of peroxide to form a strong oxidant, the ratio of available peroxide to reactive acyl groups being in the range 2:1 to 1:3, and (b) contacting the substrate with the strong oxidant at a contact pH less than 8 or pKa' if pKa' is less than 8, where pKa' is the lowest pKa of the percarboxylic acid or acids formed by perhydrolysis of the reactive acyl group or groups of the bleach activator or activators, provided that the bleach activator or mixture of bleach activators used can react with hydrogen peroxide to form a soluble diacyl peroxide. |
