摘要：

log K CuL log K CaL ratio calculated at pH 10 of at least 3.20 wherein log K CuL is the common logarithm of the Conditional Stability Constant of said chelant with Cu 2+ and log K CaL is the common logarithm of the Conditional Stability Constant of said chelant with Ca 2+ . Suitable chelants are diamine-N,N′-dipolyacids or monoamine monoamide-N,N′-dipolyacids. The compositions according to the present invention contribute to reducing the oxidative damage sustained by a keratinous fiber such as hair during bleaching, dyeing, perming or other oxidative treatments. Especially preferred diamine dipolyacid is ethylenediamine-N,N′-disuccinic acid (EDDS).

展开