Ester Quat Fabric Softener with Controlled Melt Viscosity
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Solution Overview
Problem
Existing fabric softener actives face challenges in achieving high softening performance and storage stability in aqueous dispersions without the use of volatile solvents, as they often require solvents due to high melting points and limited thermal stability, leading to viscosity issues and settling.
Innovation Solution
A fabric softener composition comprising bis-(2-hydroxypropyl)-dimethylammonium methylsulphate fatty acid ester with a specific molar ratio of fatty acid to amine, average chain length, and iodine value, along with a controlled amount of free fatty acid, allowing for processing without solvents and maintaining stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ester quats are used to achieve high softening performance, then softening performance is improved, but storage stability deteriorates due to viscosity rise and settling at temperatures above 40°C
Solution Approach 1:
The patent modifies the chemical structure parameters of the ester quat by using specific alkanolamines (diethanolamine, triethanolamine, or mixtures) and controlling the fatty acid esterification to achieve optimal balance between softening performance and storage stability. The specific structural parameters (hydroxyl groups, ether linkages) are tuned to prevent aggregation and viscosity rise during storage.
Solution Approach 2:
The invention creates a composite molecular structure combining quaternary ammonium cation with ester groups and hydroxyl/ether functional groups. This composite structure integrates multiple functions: cationic charge for fabric interaction, ester groups for biodegradability, and hydroxyl/ether groups for steric stabilization and solubility, achieving both high performance and stability.
2Ease of operation
If solvents are added to enable handling and processing, then ease of operation is improved, but product complexity and safety requirements worsen due to volatility and flammability
Solution Approach 1:
The patent removes the solvent component from the formulation entirely. By designing the ester quat with sufficient hydroxyl and ether functional groups, the molecule becomes self-sufficient for handling and processing without requiring external solvents like ethanol or isopropanol, thereby eliminating safety concerns and formulation complexity.
Solution Approach 2:
The ester quat structure serves its own solubility and handling requirements through its inherent hydroxyl and ether functional groups. These groups provide sufficient hydrophilicity and molecular flexibility for the compound to be handled and processed in its pure form without needing additional solvent assistants.
3Reliability
If high melting point ester quats are used to achieve desired performance, then softening performance is improved, but ease of manufacture worsens due to high melt viscosity requiring solvent addition
Solution Approach 1:
The patent adjusts the melting point and melt viscosity parameters by selecting specific alkanolamine structures and fatty acid compositions. The hydroxyl and ether functional groups reduce intermolecular forces and increase molecular flexibility, lowering melt viscosity to acceptable levels while preserving the softening performance through maintained cationic charge and hydrophobic interactions.
Data Source
AI summary
A fabric softener composition, comprising 1% to 49% by weight of a bis-(2-hydroxypropyl)-dimethylammonium methylsulphate fatty acid ester having a molar ratio of fatty acid moieties to amine moieties of from 1.85 to 1.99, wherein the average chain length of the fatty acid moieties is from 16 to 18 carbon atoms and the iodine value of the fatty acid moieties, calculated for the free fatty acid, is from 0.5 to 50.