Fabric Conditioner Viscosity Stability via Hydrophobic Mediator
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Solution Overview
Problem
Fabric softening compositions with saturated and monounsaturated C18 fatty acid chains face stability issues during storage, leading to unacceptable viscosity changes and phase separation, especially under variable temperature conditions.
Innovation Solution
An aqueous fabric conditioner composition containing 2-9 wt% of ester-linked quaternary ammonium compounds with 20-35 wt% saturated and 20-35 wt% monounsaturated C18 fatty acid chains, combined with 0.05-1.0 wt% of a hydrophobic agent having a ClogP of 4-7, which maintains viscosity stability above 50 cps under shear at 25°C.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fabric softening compositions use ester-linked quaternary ammonium compounds with saturated and monounsaturated C18 fatty acid chains, then fabric softening performance is improved, but physical stability deteriorates during storage leading to viscosity changes and phase separation
Solution Approach 1:
The patent introduces a specific hydrophobic agent (C12-C22 fatty acid with ClogP of 3.5-5.0) as an intermediary substance to mediate between the fabric softening active ingredient and the aqueous environment. This hydrophobic agent acts as a stabilizing mediator that prevents phase separation and viscosity degradation while maintaining the fabric softening efficacy of the ester-linked quaternary ammonium compounds.
Solution Approach 2:
The patent applies parameter changes by carefully controlling the hydrophobicity parameter (ClogP) of the added fatty acid within a specific range (3.5-5.0), and by specifying the fatty acid chain composition (20-35% saturated C18, 20-35% monounsaturated C18). These parameter optimizations resolve the stability issue while preserving fabric softening performance.
2Stability of the object's composition
If viscosity control agents or anti-gelling agents are added to improve physical stability, then storage stability is improved, but product complexity and formulation cost increase
Solution Approach 1:
The patent achieves multi-functionality by selecting a hydrophobic agent (fatty acid) that simultaneously provides viscosity control, prevents phase separation, and maintains fabric softening performance. This single ingredient performs multiple functions that would traditionally require separate viscosity control agents and anti-gelling agents, thereby reducing formulation complexity.
Solution Approach 2:
The patent optimizes the hydrophobicity parameter (ClogP) of the fatty acid within a narrow range (3.5-5.0) to achieve the desired balance between stability and simplicity. This parameter optimization allows a single ingredient to provide multiple benefits without requiring complex additive packages.
3Stability of the object's composition
If nonionic surfactants are added to improve physical stability of dilute compositions, then storage stability is improved, but the risk of phase separation and gelling increases under variable temperature conditions
Solution Approach 1:
The patent uses a hydrophobic fatty acid as an intermediary that mediates the interaction between the cationic fabric softening agent and water. This intermediary prevents the harmful effects of temperature variation by creating a stable microstructure that resists phase separation and gelling, unlike nonionic surfactants which can promote these issues.
Solution Approach 2:
The patent converts the inherent hydrophobicity of the fabric softening active ingredient, which normally causes instability, into a beneficial feature. By adding a controlled amount of hydrophobic fatty acid (ClogP 3.5-5.0), the formulation exploits hydrophobic interactions to create a stable structure that actually prevents phase separation and gelling under temperature variation.
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 viscostability with a stable viscosity range of 55-200 cps, maintaining consistency and flowability over time, addressing the stability issues faced by previous compositions.
Implementation Method 1
0.05 to 1.0 wt % by weight of the total composition of a hydrophobic agent having a ClogP of from 4 to 7
Data Source
AI summary
An aqueous fabric conditioner composition comprising (a) from 2 to 9 wt % of a fabric softening active, by weight of the total composition, wherein the fabric softening active is an ester-linked quaternary ammonium compound having fatty acid chains comprising from 20 to 35 wt % of saturated C18 chains and from 20 to 35 wt % of monounsaturated C18 chains, by weight of total fatty acid chains; and (b) from 0.05 to 1.0 wt % by weight of the total composition of a hydrophobic agent having a ClogP of from 4 to 9; wherein the aqueous fabric conditioner composition has a stable viscosity of greater than 50 cps, preferably from 55 to 200 cps as measured on a cup and bob viscometer; the viscosity being continuously measured under shear at 106s-1 for 60 seconds, at 25°C.