Acidic Fabric Care Formulation Stability via Surfactant Micelles
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Solution Overview
Problem
Liquid fabric care compositions with high citric acid and fragrance materials face physical stability issues due to phase separation, affecting their efficiency and consumer experience.
Innovation Solution
Incorporating a specific nonionic surfactant with an HLB of 12.0 to 13.9 and a Stability Parameter of 11.0 to 25.0, which forms hydrophobic micelles to suspend fragrance materials, maintaining the composition's clarity and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If fragrance materials are added to low-pH fabric care compositions, then freshness benefits and neat product odor are improved, but physical stability deteriorates due to phase separation
Solution Approach 1:
A nonionic surfactant is introduced as an intermediary substance between the fragrance materials and the acidic aqueous phase. The surfactant forms micelles that encapsulate the fragrance materials, preventing direct interaction between the hydrophobic fragrance components and the hydrophilic acidic solution, thereby preventing phase separation while maintaining fragrance benefits.
Solution Approach 2:
The invention changes the physical-chemical parameters of the fragrance delivery system by controlling the HLB value (12.0-13.9) and Stability Parameter (11.0-25.0) of the nonionic surfactant. These parameter specifications ensure optimal micelle formation and fragrance encapsulation, resolving the stability issue while preserving freshness benefits.
2Productivity
If high levels of citric acid are used, then limescale removal and fabric softening benefits are improved, but physical stability worsens due to increased acidity
Solution Approach 1:
The nonionic surfactant acts as a mediator that protects the fragrance materials from the harsh acidic environment. By forming micellar structures, the surfactant creates a protected microenvironment for the fragrance, allowing high citric acid concentrations to be used for effective limescale removal without compromising physical stability.
3Ease of manufacture
If fragrance materials are suspended in the composition, then freshness profile is maintained, but phase separation occurs without proper surfactant selection
Solution Approach 1:
The invention specifies precise parameter ranges for the nonionic surfactant: HLB value between 12.0 and 13.9, and Stability Parameter between 11.0 and 25.0. These parameter constraints ensure optimal micelle formation and fragrance encapsulation, allowing the composition to maintain a clear single phase while preserving the desired freshness profile.
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 solution ensures high phase stability and maintains the desired freshness profile, preventing phase separation and ensuring the composition remains clear and effective during storage and use.
Implementation Method 1
Incorporating a specific nonionic surfactant with an HLB of 12.0 to 13.9 and a Stability Parameter of 11.0 to 25.0, which forms hydrophobic micelles to suspend fragrance materials
Data Source
AI summary
Acidic liquid fabric care compositions that include citric acid and/or a salt thereof, a nonionic surfactant that has a Stability Parameter between 11.0 and 25.0, and water. Related methods of using and making such compositions.