Lamellar Low-Sulfate Surfactant Compositions Preventing Crystallization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing sulfate-free personal cleansing compositions with acyl isethionates face issues of crystallization due to low solubility and lack of synergy between acyl isethionates and methyl acyl taurates, leading to suboptimal lather performance and stability, especially at higher temperatures.
Innovation Solution
A lamellar liquid cleansing composition with a specific ratio of acyl isethionate to methyl acyl taurate (1.5:1 to 1:1.5) and minimal nonionic surfactants, combined with amphoteric and zwitterionic surfactants, maintains pH between 5.0 to 7.4, enhancing lather volume and creaminess.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high levels of acyl isethionates are used in liquid cleansers, then mildness and moisturization are improved, but crystallization occurs due to low solubility in aqueous systems
Solution Approach 1:
Methyl acyl taurate is introduced as an intermediary surfactant that facilitates the solubilization of acyl isethionates in aqueous systems. The methyl acyl taurate acts as a bridge between the hydrophobic acyl isethionates and water, enabling high levels of acyl isethionates to be used without crystallization while maintaining mildness and moisturization benefits.
Solution Approach 2:
The invention creates a composite surfactant system combining acyl isethionates with methyl acyl taurate in specific ratios. This composite formulation leverages the complementary properties of both surfactants: acyl isethionates provide mildness and moisturization, while methyl acyl taurate provides solubility and stability, eliminating crystallization issues.
2Productivity
If acyl isethionates and methyl acyl taurates are combined in specific ratios, then lather volume and creaminess are enhanced, but formulation complexity increases
Solution Approach 1:
The invention optimizes the formulation by establishing specific parameter ranges for the ratio of acyl isethionate to methyl acyl taurate (1:1 to 1.5:1.5 by weight). By defining this specific parameter relationship, the formulation achieves synergistic lather enhancement while providing clear guidance for manufacturing, actually simplifying the complexity rather than increasing it.
3Temperature
If formulations are made at higher temperatures for tropical regions, then stability is improved, but hydrolysis of acyl isethionates occurs at pH above 7.3
Solution Approach 1:
The invention establishes a dual parameter control system: pH between 5.0-7.4 and temperature适应性 to 32-40°C. This parameter optimization prevents hydrolysis of acyl isethionates while maintaining formulation stability in tropical conditions. The specific pH range below 7.4 is critical to prevent base-catalyzed hydrolysis, while the temperature range ensures adequate solubility 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 lather volume and stability, maintaining mildness and moisturization while avoiding crystallization, even at tropical temperatures.
Implementation Method 1
methyl acyl taurate offers a distinct advantage over the others in that methyl acyl taurates and acyl isethionates can be commercially synthesized as a mixture in a single pot reactor
Implementation Method 2
a mixture of acyl isethionate and methyl acyl taurate, when combined in a specific weight ratio, exhibit synergy and generate a superior and enhanced lather volume
Implementation Method 3
The compositions preferably are able to lather appreciably, are stable and have a lamellar (liquid crystalline) microstructure
Implementation Method 4
Formulations of the subject invention have a pH of 5.0 to 7.4, preferably 6.0 to 7.3. In preferred embodiments, composition pH is 6.3 to 7.0
Data Source
AI summary
The invention relates to lamellar liquid composition comprising acyl isethionate, methyl acyl taurate, amphoteric and/or zwitterionic surfactant. Unexpectedly, applicants have found that, when ratio of isethionate to taurate is kept at about to 1:1, enhanced lather is achieved. Other criticalities include ratio of amphoteric and/or zwitterionic to anionic surfactant, total amount of surfactant, and pH.