Antiperspirant Chelating Agent Substitution
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Solution Overview
Problem
Current chelating agents in the cosmetic and personal care industry, such as EDTA, are not biodegradable and have limitations in enhancing antiperspirant performance, particularly in reducing yellowing caused by free iron cations.
Innovation Solution
Compositions comprising aluminum as an antiperspirant active, ethylenediamine disuccinate salt, and water, with a molar ratio of aluminum to ethylenediamine disuccinate ranging from 15:1 to 150:1, are used to enhance antiperspirant efficacy by increasing the amount of SEC Peak 4 material, thereby improving deodorancy and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If EDTA or its sodium salts are used as chelating agents in antiperspirant formulations, then preservation system is boosted and yellowing caused by free iron cations is reduced, but biodegradability is poor
Solution Approach 1:
The patent changes the chemical structure parameter of the chelating agent from EDTA to ethylenediamine disuccinate (EDDS), which has similar chelating properties but improved biodegradability. This parameter change maintains the preservation system effectiveness while resolving the environmental harm issue.
Solution Approach 2:
The patent employs a biodegradable chelating agent (EDDS) that can be naturally broken down and replaced in the environment, analogous to using disposable items that do not persist. This resolves the contradiction by allowing the chelating function to be temporary and renewable rather than persistent.
2Reliability
If conventional chelating agents are used, then metal complex formation is achieved, but enhancement of antiperspirant performance is limited
Solution Approach 1:
The patent optimizes the molar ratio parameter of aluminum to ethylenediamine disuccinate (specifically 15:1 to 150:1) to maximize antiperspirant performance. This parameter optimization enables superior performance compared to conventional chelating agents while maintaining effective metal complex formation.
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 use of ethylenediamine disuccinate salt in antiperspirant compositions increases the intensity of SEC Peak 4, leading to enhanced antiperspirant performance and stability, while being biodegradable and free from ethylenediaminetetraacetic acid salts.
Implementation Method 1
EDTA forms a variety of stable metal complexes with exceptionally high stability constants making it a desirable ingredient to suppress unwanted activity of heavy metals. Ethylenediamine disuccinate salt is used as a biodegradable alternative with similar chelating properties.
Implementation Method 2
WO95/30405 discloses antiperspirant gel stick compositions comprising an antiperspirant active, preferably a complex of aluminum, zirconium and amino acids and a chelator capable of complexing with the active.
Data Source
AI summary
Antiperspirant compositions that incorporate ethylene diamine disuccinate salts as replacements for ethylenediaminetraacetic acid salts.