CO2 Aerosol Composition Balancing Conditioning and Storage Stability
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Solution Overview
Problem
Aerosol compositions containing high concentrations of cationic surfactants and higher alcohols with carbon dioxide as a propellant suffer from separation issues during storage, necessitating shaking before use.
Innovation Solution
An aerosol composition with a specific ratio of mono-long-chain-alkyl type cationic surfactant and linear saturated higher alcohol, combined with carbon dioxide, maintains stability without separation over time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high concentrations of cationic surfactant and higher alcohol are used to enhance smooth use feeling and conditioning effect, then the conditioning performance is improved, but the composition undergoes separation during storage
Solution Approach 1:
The patent applies parameter changes by precisely controlling the content of cationic surfactant (0.9-6.0% by mass) and establishing a specific molar ratio range of higher alcohol to cationic surfactant (3.0-7.0). This quantitative parameter optimization resolves the contradiction by finding the optimal balance point where sufficient conditioning effect is achieved while preventing composition separation during storage.
2Ease of operation
If carbon dioxide gas is used as propellant to provide creamy and elastic foam, then the foam quality and retention are improved, but the composition becomes prone to separation
Solution Approach 1:
The patent uses parameter changes by optimizing the concentration parameters of cationic surfactant and higher alcohol, and their molar ratio, to achieve compatibility with carbon dioxide propellant. This allows the system to maintain both the creamy elastic foam quality and storage stability without separation.
3Reliability
If the molar ratio of higher alcohol to cationic surfactant is increased to improve smooth use feeling, then the conditioning performance is enhanced, but the composition stability deteriorates
Solution Approach 1:
The patent applies parameter changes by defining a specific molar ratio range of higher alcohol to cationic surfactant (3.0-7.0). This controlled parameter change ensures that the smooth use feeling and conditioning performance are enhanced while maintaining composition stability during storage.
Data Source
AI summary
An aerosol composition including an aerosol stock solution containing a cationic surfactant (A) and a linear saturated higher alcohol (B), and a propellant (C) containing carbon dioxide. The component (A) containing a mono-long-chain-alkyl cationic surfactant (A1). A content of the component (A) being 0.9% by mass or more and less than 6.0% by mass in the aerosol stock solution. A molar ratio [(B)/(A1)] of the component (B) with respect to the component (A1) being 3.0 or more and 7.0 or less in the aerosol stock solution. A content of the component (A1) in the component (A) being 90% by mass or more and 100% by mass or less, and a difference between a number of carbon atoms of the long-chain alkyl in the component (A1) and the number of carbon atoms of the component (B) being 0.