Sulfate-Free Surfactant System for Personal Care Formulations
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Solution Overview
Problem
Current personal care compositions containing sulfate-containing surfactants face issues such as skin and scalp irritation, oil stripping, and the challenge of maintaining viscosity, foaming properties, and conditioning without using large amounts of surfactants, which can increase costs and tolerance risks.
Innovation Solution
A sulfate-free personal care composition comprising a surfactant system of methyl oleoyl taurate, isethionate, and alkoxylated sulfosuccinate, along with a conditioning agent, which achieves acceptable viscosity, foaming properties, and conditioning without the need for excessive surfactant amounts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If sulfate-containing surfactants (SLS, SLES, ALS, ALES) are used in personal care compositions, then satisfactory cleansing and foaming properties are achieved at low cost, but skin and scalp irritation and oil stripping occur
Solution Approach 1:
The patent changes the chemical parameters of the surfactant system by replacing sulfate-containing surfactants with sulfate-free alternatives (amino acid-based surfactants like sodium cocoyl glycinate, sodium lauroyl sarcosinate, and their derivatives). This parameter change maintains cleansing and foaming functionality while eliminating the harmful irritation effects, directly resolving the contradiction between cost/ease of manufacture and skin safety
Solution Approach 2:
The patent employs composite surfactant systems that combine multiple sulfate-free surfactants (amino acid-based anionic surfactants with amphoteric or nonionic surfactants) to achieve synergistic effects. This composite approach maintains satisfactory cleansing, foaming, and conditioning properties without the harmful effects of sulfate-containing surfactants, resolving the contradiction while preserving overall performance
2Quantity of substance
If sulfate-containing surfactants are used, then satisfactory cleansing and foaming properties are achieved, but viscosity control becomes difficult without excessive salt addition
Solution Approach 1:
The patent changes the rheological parameters of the composition by using amino acid-based surfactants that inherently provide better viscosity stability. These surfactants form more stable micellar structures that maintain consistent viscosity across different concentrations and conditions, eliminating the need for excessive salt addition and resolving the contradiction between cleansing effectiveness and viscosity stability
Solution Approach 2:
The patent introduces amino acid-based surfactants as intermediary substances that mediate between the cleansing function and viscosity control. These surfactants serve dual roles: providing effective cleansing and foaming while simultaneously acting as viscosity modifiers that stabilize the composition, thus resolving the contradiction without requiring additional thickening agents
3Object-affected harmful factors
If large amounts of surfactants are used to achieve desired foam volume and quality in sulfate-free compositions, then foaming properties improve, but cost increases and tolerance risks increase
Solution Approach 1:
The patent uses composite surfactant systems combining amino acid-based anionic surfactants with amphoteric surfactants (like cocamidopropyl betaine) or nonionic surfactants. This composite formulation creates synergistic effects where the combination of different surfactant types produces superior foam volume and quality at lower total surfactant concentrations, directly resolving the contradiction between foaming performance and surfactant quantity
Solution Approach 2:
The patent changes the surfactant concentration parameters by optimizing the ratio and concentration of different sulfate-free surfactants in the composite system. This optimized parameter configuration achieves desired foaming properties with reduced total surfactant content, lowering both cost and tolerance risks while maintaining effective foam generation
Data Source
AI summary
The present invention relates to sulfate-free aqueous personal care composition comprising a surfactant system comprising at least one methyl oleoyl taurate, one isethionate and one alkoxylated sulfosuccinate, and from about 0.2 pbw to about 15 pbw of a conditioning agent. It is also directed toward the use of such a composition for washing keratin substrates, in particular the hair or the scalp.