Solid Fabric Softener Composition With High Quat Stability
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Solution Overview
Problem
Developing a solid fabric softener composition that is environmentally friendly, has a high active content, and maintains performance comparable to traditional liquid softeners, while avoiding melting, weeping, or separation during storage and transport, and ensuring adequate dispense rates during the rinse cycle.
Innovation Solution
A solid fabric softener formulation stabilized with a combination of a water-soluble organic salt and a medium to long chain carboxylic acid, allowing for up to 70% quaternary ammonium compound content, which remains stable at typical storage temperatures and dissolves appropriately in the rinse cycle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If liquid fabric softener compositions are used, then ease of dispensing and handling is improved, but water content is high (90-95%) requiring large packaging and transport weight
Solution Approach 1:
The patent transitions the fabric softener composition from liquid phase to solid phase by incorporating waxes (microcrystalline wax, paraffin wax, or vegetable wax) as structuring agents. This phase transition enables the composition to maintain a solid form at room temperature while still dispensing effectively when heated during the rinse cycle, thereby reducing water content from 90-95% to approximately 72-80% or lower.
Solution Approach 2:
The patent changes the physical state parameters of the composition by controlling the melting point of the solidifying agents and the composition ratios of waxes and softening agents. The waxes are selected to melt at temperatures achievable during typical rinse cycles (40-60°C), transforming the solid composition into a dispensable liquid form during use while maintaining solid form during storage and transport.
2Quantity of substance
If solid fabric softener compositions are used, then packaging material and transport weight are reduced, but stability during storage and transport at various temperatures is compromised
Solution Approach 1:
The patent creates a composite material system combining fabric softening agents (quat compounds) with structuring agents (waxes including microcrystalline wax, paraffin wax, and/or vegetable wax). This composite structure provides thermal stability during storage while enabling controlled dispensing during use, as the waxes maintain the solid form at storage temperatures but melt at rinse cycle temperatures.
Solution Approach 2:
The patent incorporates antioxidants (such as BHT, BHA, or tocopherols) and chelating agents (such as EDTA or citric acid) into the composition before storage to prevent oxidative degradation and maintain stability during storage and transport, cushioning against potential composition breakdown.
3Quantity of substance
If concentrated fabric softener compositions are used, then water content and environmental impact are reduced, but dispense rate during rinse cycle may be insufficient
Solution Approach 1:
The patent utilizes phase transition of the wax-based structuring agents to control dispense rate. The composition remains solid during storage but melts and becomes freely dispensable when exposed to heated rinse water (40-60°C), ensuring adequate dispense rate during the rinse cycle while maintaining concentrated formulation.
Solution Approach 2:
The patent creates a dynamic system where the physical state of the composition changes from solid to liquid based on temperature conditions. The waxes are selected and formulated to undergo this transition at rinse cycle temperatures, enabling the composition to adapt its dispensability to the operational conditions without requiring high water content.
4Reliability
If high levels of quaternary ammonium compound are used, then fabric softening performance is improved, but composition stability and resistance to melting/weeping is reduced
Solution Approach 1:
The patent formulates a composite material where fabric softening agents (quat compounds at 20-70% level) are combined with structuring waxes (microcrystalline wax, paraffin wax, and/or vegetable wax). The waxes provide structural integrity and prevent melting or weeping during storage, while the quat compounds deliver fabric softening performance. The combined system maintains both stability and effectiveness.
Solution Approach 2:
The patent controls the melting point parameters of the composition by selecting waxes with appropriate melting points and adjusting the ratio of softening agent to structuring agent. This parameter optimization ensures the composition remains stable at storage temperatures while achieving adequate dispense rate during the rinse cycle, preventing both premature melting and insufficient dispensing.
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 formulation provides fabric softening performance comparable to traditional liquid compositions, maintains stability, and ensures adequate dispense rates during the rinse cycle, making it environmentally friendly and economically feasible.
Implementation Method 1
a cationic fabric softening agent dispersed in water
Implementation Method 2
dissolves appropriately in the rinse cycle
Data Source
AI summary
A solid fabric softening composition is disclosed which includes a quaternary ammonium fabric softening compound which is stabilized to form a solid with a mixture of a water soluble organic salt and a medium to long chain carboxylic acid. This stabilizing combination has been shown to effectively form a solid quaternary ammonium based fabric softening composition with up to as much as 70% by weight of quaternary ammonium compound. The formulations are stable at typical storage temperatures of up to 110° F. and provide fabric softening similar to and even superior to other traditional liquid formulations.