Selective Copper Chelant Shampoo for Hair Color Protection
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Solution Overview
Problem
Existing shampoo compositions are ineffective in inhibiting the deposition of copper salts on hair and removing them, as most chelants also bind calcium and magnesium, leading to interference with hair coloring treatments and damage from reactive oxygen species.
Innovation Solution
A shampoo composition containing 0.005% to 5% of specific chelants with a molecular structure that preferentially binds copper, combined with 2% to 50% detersive surfactants and 75% to 98% aqueous carrier, designed to inhibit copper deposition and facilitate its removal from hair.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional chelants are used to sequester trace redox metals, then some metal binding occurs, but they also competitively bind calcium and magnesium, reducing effectiveness
Solution Approach 1:
The chelant is designed with specific molecular structure characteristics (log P value between -5 and 2, molecular weight between 50 and 500, specific functional groups) that create local chemical environment preferences, enabling selective binding to copper ions while minimizing interaction with calcium and magnesium ions
Solution Approach 2:
The invention changes the chemical parameters of the chelant molecule, specifically controlling the log P value (partition coefficient) between -5 and 2, molecular weight between 50 and 500, and incorporating specific functional groups (Y and Z selections), to optimize copper binding affinity (log KML > 6) while reducing non-specific binding to other metal ions
2Ease of operation
If copper salts deposit on hair, then hair cleansing occurs, but copper facilitates redox reactions that damage hair and interfere with hair coloring
Solution Approach 1:
The chelant is applied to hair before or during copper deposition to prevent copper from binding to hair proteins and facilitating redox reactions. By establishing copper-chelant complexes in advance, the system prevents the harmful redox chemistry that would otherwise occur on the hair surface
Solution Approach 2:
The invention converts the harmful interaction between copper and hair into a beneficial copper-chelant complexation. The copper ions that would normally cause damage are instead sequestered by the chelant, transforming a harmful redox-active copper species into a benign chelated complex that can be safely removed during rinsing
3Ease of operation
If copper is already deposited on hair, then hair appears cleaned, but copper remains embedded and continues to cause damage
Solution Approach 1:
The chelant is formulated to penetrate into the hair structure and pre-complex with embedded copper ions before rinsing. This preliminary chelation action occurs during the brief shampoo application time, allowing the copper-chelant complex to form and then be easily removed together during the rinsing step
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The shampoo effectively reduces copper content on hair, preventing damage and ensuring better hair color uptake by forming a strong, water-soluble copper-chelant complex that is easily rinsed off.
Implementation Method 1
the one or more chelants have a molecular structure as follows: wherein n is 2 or 3; m is 1, 2, 3, or 4; and Y and Z are independently selected from the group consisting of hydrogen, methyl, ethyl, propyl, butyl, pentyl, —CH2CH2OH, —CH2CH(CH3)OH), —CH2CH2NH2, —CH2CH(CH3) NH2, and combinations thereof; and wherein the one or more chelants comprise: (1) log of the formation constant log KML of its complex with copper is higher than 6
Data Source
AI summary
Described herein is a shampoo composition and methods of using the same, the shampoo composition including a copper chelant, a detersive surfactant, and a carrier.