Esterquat Mixtures for Transparent Fabric Softeners
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Solution Overview
Problem
Existing fabric softener formulations containing esterquats are often turbid and not optically transparent, lacking stability upon storage, and require high concentrations of esterquats or additional solvents and additives.
Innovation Solution
A mixture of cationic surfactants is obtained through a process involving the esterification of hydroxyl group-containing compounds with carboxylic group-containing compounds, followed by cation formation, which forms clear, optically transparent solutions in water at room temperature without the need for additional additives.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If esterquat formulations are prepared using conventional methods, then softening performance is achieved, but the formulations become turbid and not optically transparent
Solution Approach 1:
The patent changes the chemical parameters of the esterquat molecules by controlling the esterification process with specific diacids and monoacids in defined molar ratios. This molecular-level parameter change enables the formulation to form clear solutions in water without requiring additional solvents or additives, simultaneously achieving optical transparency and formulation stability
Solution Approach 2:
The invention creates a composite esterquat molecule incorporating both diacid and monocarboxylic acid components in specific ratios. This composite structure provides both the optical clarity of small molecules and the stability of complex formulations, resolving the contradiction between transparency and stability
2Quantity of substance
If high concentrations of esterquats are used to achieve softening performance, then softening efficacy is improved, but the formulations require excessive use of solvents or further additives
Solution Approach 1:
The patent optimizes the concentration parameter by demonstrating that effective softening can be achieved at low esterquat concentrations (0.1-10% w/w) when the esterquats are synthesized with the specific diacid/monocacid molar ratio of 0.10 to 1.0. This parameter optimization eliminates the need for excessive solvents or additives while maintaining softening efficacy
Solution Approach 2:
The invention extracts and eliminates the need for additional solvents and additives from the formulation by incorporating all necessary functional properties into the esterquat molecule itself through controlled synthesis. The resulting formulation contains only water and esterquat, simplifying the system while maintaining performance
3Ease of operation
If esterquat formulations are prepared at room temperature, then ease of operation is improved, but optical transparency and storage stability are compromised
Solution Approach 1:
The patent applies preliminary action by pre-synthesizing the esterquat molecules with the correct molecular structure and composition before the formulation step. The esterification and cation formation are completed in advance with precise control of molar ratios, so that the final formulation step at room temperature simply requires mixing with water to produce an optically transparent solution
Solution Approach 2:
The invention changes the temperature parameter from conventional elevated processing temperatures to room temperature (below 40°C) by ensuring the esterquat molecules are pre-optimized during synthesis. This parameter change is enabled by the specific molecular structure created through controlled esterification, allowing clear solution formation without thermal processing
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 resulting surfactant mixtures create optically transparent and stable softener formulations that can be used at low esterquat concentrations, maintaining clarity and stability under various storage conditions.
Implementation Method 1
Step I: esterification of a) with b)
Implementation Method 2
Step II: cation formation from the reaction products of Step I
Implementation Method 3
forms clear, optically transparent solutions in water at room temperature
Data Source
AI summary
The present invention relates to mixtures of cationic surfactants useful for preparing optically transparent softening compositions; compositions comprising such mixtures; and their use for softening fabrics and/or fibres.