Personal Cleansing Composition With Polysaccharide Rheology Control
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Solution Overview
Problem
Existing personal cleansing compositions struggle to achieve stable rheology and effective suspension of benefit agents while being free of alkyl sulfate and alkyl ether sulfate surfactants, particularly with fatty acyl isethionates, which have low water solubility and form unstable compositions.
Innovation Solution
A personal cleansing composition comprising a surfactant system with 0.1% to 5% fatty acyl isethionate, 0.5% to 40% co-surfactant, and 0.05% to 5% natural or chemically modified polysaccharide, forming a micellar and polymer liquid crystalline phase to provide stable structure and suspension of benefit agents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If high levels of surfactants are used to thicken sulfate-free formulas, then the composition achieves sufficient thickness and structure, but the cost increases significantly
Solution Approach 1:
The patent introduces polysaccharide derivatives as intermediary rheology modifiers that mediate between the surfactant system and the desired thickened structure. These polysaccharide derivatives act as bridging agents that enable thickening at lower surfactant concentrations by forming a network structure that traps and stabilizes the surfactant micelles, thereby achieving the desired viscosity without requiring excessive surfactant levels
Solution Approach 2:
The patent changes the rheological parameters of the composition by incorporating polysaccharide derivatives that modify the flow characteristics. The polysaccharide derivatives alter the viscosity, elastic modulus, and other rheological properties of the formulation, enabling the composition to achieve sufficient thickness and structure at lower surfactant concentrations through parameter modification rather than simply increasing ingredient quantity
2Strength
If high levels of rheology modifiers are used to thicken sulfate-free formulas, then the composition achieves sufficient thickness, but the foam volume and ease of distribution decrease
Solution Approach 1:
The patent optimizes the concentration and molecular weight parameters of the polysaccharide derivatives to achieve the desired rheological modification without excessive foam suppression. By carefully controlling these parameters, the formulation maintains adequate thickness while preserving sufficient foam volume and distribution characteristics
Solution Approach 2:
The patent creates a composite system combining polysaccharide derivatives with specific surfactant combinations. This composite approach allows the polysaccharide network to provide thickening while the surfactant system maintains foam stability, as the interaction between the two components creates a synergistic effect that balances structure and foam properties
3Object-affected harmful factors
If fatty acyl isethionate surfactants are used in liquid personal cleansing compositions, then the composition achieves mildness and good emollient properties, but the solubility in water is low resulting in unstable compositions
Solution Approach 1:
The patent introduces polysaccharide derivatives as intermediary agents that facilitate the solubility of fatty acyl isethionate surfactants in aqueous formulations. The polysaccharide derivatives act as solubilizing agents that form complexes with the surfactant molecules, enabling them to dissolve and remain stable in water-based compositions while preserving the mildness and emollient properties of the isethionate surfactants
Solution Approach 2:
The patent creates a composite surfactant system combining fatty acyl isethionate with polysaccharide derivatives and co-surfactants. This composite approach enhances the aqueous solubility and stability of the formulation while maintaining the gentle cleansing properties, as the interaction between multiple components creates a synergistic effect that overcomes the low solubility issue
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 stable rheology with good foam and creamy texture, effectively suspending benefit agents, while maintaining a satisfactory ecotoxic profile and esthetic properties.
Implementation Method 1
the surfactant system comprises: from about 0.1% to about 5%, of a fatty acyl isethionate surfactant by weight of the composition; from about 0.5% to about 40%, of a co-surfactant
Implementation Method 2
wherein the personal cleansing composition comprises a first and second phase, wherein the first phase is an isotropic and micellar surfactant phase; wherein the second phase is a polymer liquid crystalline phase
Implementation Method 3
the polymer liquid crystalline phase comprises polymer liquid crystals comprising the natural polysaccharide, the chemically modified natural polysaccharide, or the combination
Data Source
AI summary
A personal cleansing composition includes: (a) a surfactant system, wherein the surfactant system includes: from about 0.1% to about 5%, of a fatty acyl isethionate surfactant; from about 0.5% to about 40%, of a co-surfactant, wherein the co-surfactant is selected from the group consisting of an anionic surfactant being not an isethionate surfactant, a non-ionic surfactant, an amphoteric surfactant, a zwitterionic surfactant, and mixtures thereof; (b) from about 0.05% to about 5%, of a natural polysaccharide, a chemically modified natural polysaccharide, or a combination thereof; wherein the personal cleansing composition includes a first and second phase, wherein the first phase is an isotropic and micellar surfactant phase; wherein the second phase is a polymer liquid crystalline phase which includes polymer liquid crystals of the natural polysaccharide, the chemically modified natural polysaccharide, or the combination.