Foamable Skin Composition with Acidic pH and Stable Foam
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Foamable skin compositions with alkaline pH disrupt the skin's natural barrier function and suffer from low foam stability at acidic pH, making it challenging to create stable foams suitable for pharmaceutical or cosmetic applications with acidic pH ranges.
Innovation Solution
A foamable skin composition comprising C12-C22 fatty acid, C12-C22 fatty alcohol, ester or vegetable oil, non-ionic surfactant, emollient, and water, with specific concentration ranges, that maintains an acidic pH while achieving stable foam formation and improved skin compatibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If alkaline pH is used to achieve sufficient foam stability, then foam stability is improved, but skin compatibility deteriorates because the pH is much higher than the natural skin pH range
Solution Approach 1:
The invention changes the pH parameter from alkaline (pH > 7.0) to acidic (pH < 7.0), specifically formulating the composition with pH 3.0-6.5 to match skin's natural pH range. This parameter change resolves the contradiction by achieving foam stability through acidic pH-compatible surfactant systems rather than requiring alkaline conditions.
Solution Approach 2:
The invention uses a composite surfactant system combining anionic surfactants (sodium lauryl sulfate, sodium myristate) with cationic surfactants (cetyl trimethyl ammonium bromide) and nonionic surfactants (polysorbates). This composite approach enables foam stability at acidic pH by creating synergistic interactions between different surfactant types, eliminating the need for alkaline pH.
2Object-affected harmful factors
If acidic pH is used to maintain skin compatibility, then skin compatibility is improved, but foam stability deteriorates because low pH destabilizes the foam
Solution Approach 1:
The invention employs a composite surfactant system containing anionic, cationic, and nonionic surfactants that work synergistically to maintain foam stability at acidic pH. The cationic surfactant (cetyl trimethyl ammonium bromide) particularly contributes to foam stability in acidic conditions, while the combination with anionic and nonionic surfactants prevents precipitation and maintains overall foam structure.
Solution Approach 2:
The invention optimizes the pH parameter within the acidic range (pH 3.0-6.5) to balance skin compatibility and foam stability. By controlling pH within this specific range and adjusting surfactant concentrations accordingly, the composition achieves both skin-friendly properties and sufficient foam stability without requiring alkaline conditions.
3Object-affected harmful factors
If active ingredients are added to lower pH to acidic range, then skin compatibility is improved, but foam stability deteriorates due to low pH destabilizing the foam
Solution Approach 1:
The invention uses active ingredients such as salicylic acid, lactic acid, or glycolic acid at controlled concentrations (0.1-5.0%) to adjust and maintain pH within the acidic range (3.0-6.5). These pH-adjusting active ingredients are incorporated into the composite surfactant system that is specifically designed to remain stable at these acidic levels, thus achieving both skin compatibility and foam stability simultaneously.
Solution Approach 2:
The invention incorporates pH-adjusting active ingredients into a composite surfactant system containing anionic, cationic, and nonionic surfactants. This composite approach ensures that the foam structure remains stable despite the presence of acidic active ingredients, as the multiple surfactant types work synergistically to maintain foam integrity at acidic pH levels.
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 a stable, skin-friendly foam with enhanced spreadability and cosmetic elegance, maintaining foam stability and skin compatibility even at acidic pH, suitable for various applications.
Implementation Method 1
at least one non-ionic surfactant at a concentration of 1-15%
Implementation Method 2
at least one C12-C22 fatty acid at a concentration of 1-3%, at least one C12-C22 fatty alcohol at a concentration of 1-5%
Data Source
AI summary
A foamable skin composition comprises, in % by weight of the foamable skin composition, at least one C12-C22 fatty acid at a concentration of 1-3%, at least one C12-C22 fatty alcohol at a concentration of 1-5%, at least one ester and/or vegetable oil at a concentration of 1-40%, at least one non-ionic surfactant at a concentration of 1-15%, at least one emollient at a concentration of 0.5-10% and water. The foamable skin composition has an acidic pH but still forms a stable form following dispensing.