Amino Acid Emulsion Stability via Particle Size Reduction
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Solution Overview
Problem
Existing emulsion cosmetics with amino acid-based oil agents struggle with emulsion stability and pH stability, preventing them from effectively penetrating between skin cells and providing sustained moisturizing and barrier functions.
Innovation Solution
An emulsion composition containing an amino acid-based oil agent, lecithin, polyglycerin fatty acid ester, and polyaspartic acid or its salt, with a pH of 4.5 to 7, and an average particle size of 30 nm to 500 nm, which is produced using a high-pressure emulsification method to enhance stability and skin penetration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If emulsion cosmetics contain amino acid-based oil agents with microparticle size, then they can provide moisturizing function, but they cannot penetrate between corneocytes and are easily removed by friction
Solution Approach 1:
The patent applies parameter changes by reducing the average particle size of the emulsion from micron level to 30-200 nm range, transforming it into a microemulsion. This drastic size reduction enables penetration between corneocytes while maintaining moisturizing function. The specific parameter changed is the particle size, which directly resolves the contradiction between providing moisturizing function and enabling skin penetration.
2Length of moving object
If microemulsion technology is used to reduce particle size, then skin penetration is improved, but emulsion stability and pH stability become insufficient
Solution Approach 1:
The patent uses composite materials by formulating a microemulsion containing amino acid-based oil agents (0.1-10 wt%), lecithin (0.01-5 wt%), and polyhydric alcohol (1-30 wt%). This composite formulation achieves both fine particle size (30-200 nm) for skin penetration and sufficient emulsion stability, resolving the contradiction between particle size reduction and stability maintenance.
Solution Approach 2:
The patent applies parameter changes by controlling the pH of the microemulsion within a specific range (pH 3-8, preferably pH 4-7) and adjusting the composition ratios of amino acid-based oil agents, lecithin, and polyhydric alcohol. These parameter optimizations ensure both fine particle size for penetration and adequate pH stability, resolving the contradiction between particle size and stability.
3Stability of the object's composition
If general emulsion cosmetics are used, then emulsion stability is maintained, but they cannot penetrate between skin cells and provide sustained moisturizing function
Solution Approach 1:
The patent applies parameter changes by transforming the emulsion from conventional micron-level particle size to microemulsion range (30-200 nm), while simultaneously optimizing the composition to include amino acid-based oil agents (0.1-10 wt%), lecithin (0.01-5 wt%), and polyhydric alcohol (1-30 wt%). This dual optimization achieves both fine particle size for skin penetration and sufficient emulsion stability, resolving the contradiction between particle size and stability.
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 achieves superior emulsion and pH stability, allowing the amino acid-based oil agent to effectively penetrate the stratum corneum layer, providing enhanced moisturizing and barrier functions to the skin.
Implementation Method 1
which is produced using a high-pressure emulsification method to enhance stability and skin penetration
Implementation Method 2
having a pH of 4.5 to 7
Data Source
AI summary
Emulsion compositions containing (a) amino acid-based oil agent, (b) lecithin, (c) polyglycerin fatty acid ester, and (d) one or more kinds selected from the group consisting of polyaspartic acid and a salt thereof, and having a pH of 4.5 to 7, are superior in emulsion stability and pH stability and can penetrate between the cells of the stratum corneum layer of the skin.