Compositions suitable for the treatment of hair comprising chelants and methods for reducing oxidative hair damage

摘要

The present invention relates to hair care compositions comprising an oxidizing agent and chelants having 1 $\frac{\log K_{\mathrm{CuL}}}{\log K_{\mathrm{CaL}}}$ ratio calculated at pH 10 of at least 3.20 wherein log KCuL is the common logarithm of the Conditional Stability Constant of said chelant with Cu<2+> and log KCaL 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).