Method of inhibiting copper deposition on hair

Abstract

A method of inhibiting copper deposition on hair and facilitating the removal of copper deposited on hair including applying to the hair a shampoo composition having ethylenediamine-N,N′-disuccinic acid (EDDS) and / or histidine, rinsing the shampoo composition from the hair, applying to the hair a conditioner composition comprising histidine, rinsing the conditioner composition from the hair, and applying to the hair a leave-on treatment comprising ethylenediamine-N,N′-disuccinic acid (EDDS).

Description

FIELD OF THE INVENTION[0001]The present invention relates to a method of inhibiting copper deposition on hair and facilitating the removal of copper deposited on hair.BACKGROUND OF THE INVENTION[0002]Many water sources that are used by consumers for personal care contain elevated levels of calcium and magnesium salts, as well as undesirable levels of redox metals (e.g., copper and / or iron) salts. As such, using chelants to sequester trace redox metals often proves to be ineffective because most chelants also competitively bind calcium and / or magnesium.[0003]It has been found that even trace quantities of copper can deposit on the hair surface and in between the cuticle layers of hair. This deposition of copper on hair is especially problematic because transition metal ions, such as copper and iron, can facilitate reduction-oxidation (redox) reactions during hair coloring treatments and during UV exposure. These reactions generate reactive oxygen species (ROS), which in turn can caus...

AI Technical Summary

Benefits of technology

The patent text describes a method for preventing copper deposition on hair and effectively removing copper deposits. The method involves using a shampoo composition with ethylenediamine-N,N′-disuccinic acid or its derivatives, detersive surfactants, and an aqueous carrier. After rinsing, a conditioner composition with histidine and a gel matrix is applied. Another round of rinsing is followed by a leave-on treatment with ethylenediamine-N,N′-disuccinic acid, rheology modifiers, and an aqueous carrier. The technical effect of the patent is to provide a method for preventing and removing copper deposition on hair, which can help to protect and maintain its appearance.

Problems solved by technology

Many water sources that are used by consumers for personal care contain elevated levels of calcium and magnesium salts, as well as undesirable levels of redox metals (e.g., copper and / or iron) salts.

As such, using chelants to sequester trace redox metals often proves to be ineffective because most chelants also competitively bind calcium and / or magnesium.

This deposition of copper on hair is especially problematic because transition metal ions, such as copper and iron, can facilitate reduction-oxidation (redox) reactions during hair coloring treatments and during UV exposure.

These reactions generate reactive oxygen species (ROS), which in turn can cause damage to the hair.

In addition, they can interfere with the oxidative color formation chemistry and lead to reduced color uptake for hair colorant users.

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