Metal Capturing Agents for Skin Protection
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Solution Overview
Problem
Current cosmetic and pharmaceutical compositions fail to effectively protect skin from metal irritants and allergens like nickel, cobalt, and chromium, often causing contact dermatitis, and existing solutions either irritate the skin or are not cosmetically acceptable.
Innovation Solution
A composition containing metal capturing agents with carboxyl, sulfonyl, or sulfate moieties, such as polyacrylic acid polymers and carrageenans, that remain stable at physiological pH, effectively capturing metal ions and preventing their penetration through the skin.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If occlusive ingredients (vaseline, dimethicone) are used to form a protective barrier layer on the skin, then protection against metal penetration is improved, but skin irritation and allergic reactions worsen
Solution Approach 1:
The patent introduces metal chelating agents as intermediary substances that specifically bind to metal ions (nickel, cobalt, chromium) through chemical coordination. These agents act as mediators between the skin and metal allergens, capturing metal ions before they can penetrate the skin barrier, thereby providing protection without forming occlusive films that cause irritation.
Solution Approach 2:
The patent changes the protection mechanism from physical barrier formation to chemical binding by utilizing the chelating properties of specific molecules. This parameter change allows the composition to bind metal ions through chemical affinity rather than relying on occlusive physical layers, thus avoiding skin irritation while maintaining protection efficacy.
2Reliability
If varnish is applied to create a protective layer between skin and metal, then protection against metal allergy is improved, but cosmetic acceptability and skin compatibility worsen
Solution Approach 1:
The patent transforms the protective mechanism from a thick occlusive varnish layer to a lightweight cosmetic composition containing chelating agents. This parameter change in formulation approach maintains protection efficiency while dramatically improving cosmetic acceptability, allowing daily use without the heavy, suffocating feel associated with traditional barrier varnishes.
Solution Approach 2:
The chelating agents serve as molecular intermediaries that provide protection through chemical binding rather than physical barrier formation. This intermediary mechanism enables the use of thin, cosmetically pleasing formulations that do not require thick varnish layers, thus improving ease of application and cosmetic acceptability.
3Reliability
If calcium carbonate particles are used to capture metal ions, then metal binding capacity is improved, but skin pH balance worsens due to alkaline suspension
Solution Approach 1:
The patent changes the chemical nature of the metal-binding agent from basic calcium carbonate to chelating molecules with appropriate pKa values that function effectively at physiological skin pH. This parameter change in chemical composition allows metal binding without disrupting skin pH balance, as the chelating agents remain protonated and effective in the slightly acidic skin environment.
Solution Approach 2:
The patent replaces the need for alkaline buffering systems with chelating agents that function directly at skin pH. This substitution eliminates the requirement for pH-adjusting components like calcium carbonate suspensions, simplifying the formulation and maintaining skin pH stability without compromising metal binding capacity.
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 composition provides effective protection against metal irritants and allergens, reducing the risk of contact dermatitis and skin irritation while being cosmetically acceptable and stable for daily use.
Implementation Method 1
specific metal capturing agents bearing carboxyl, sulfonyl or sulfate moieties which combine the ability to effectively capture metals such as nickel
Data Source
AI summary
The subject of the present invention is cosmetic or pharmaceutical compositions which are protective against common skin irritants or allergens. The invention is also directed to the use of these compositions to protect skin from the effects of metal. Another object of the invention is a method of preventing or protecting the skin from the effects of metal, using the compositions of the invention.