Laundry Detergent Stability at pH 6.2-9 via Alkyl Ether Carboxylic Acid
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Solution Overview
Problem
Existing liquid laundry detergent compositions lack stability at pH levels between 6.2 and 9, which affects the softness and color retention of fabrics during multiple wash cycles.
Innovation Solution
A liquid laundry detergent composition comprising nonionic surfactant, anionic surfactant, alkyl ether carboxylic acid or carboxylate salt, cationic polysaccharide polymer, and optionally additional ingredients like shading dye, enzyme, or soil release polymer, formulated to maintain stability at pH levels of 6.2 to 9, with specific weight percentages and preferred components such as cationic guar or cellulose polymers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If conventional formulations with cationic polymer and anionic surfactant are used, then fabric softness is improved, but formulation stability deteriorates at pH 6.2 to 9
Solution Approach 1:
The patent changes the chemical parameters of the formulation by introducing alkyl ether carboxylic acid (AEC) as a key ingredient at 1-12 wt.%, which fundamentally alters the formulation's stability characteristics at pH 6.2-9. This parameter change enables the system to maintain both stability and fabric softness that conventional formulations cannot achieve simultaneously
Solution Approach 2:
The patent creates a composite formulation system combining four distinct ingredient classes: nonionic surfactant (2-40 wt.%), anionic surfactant (4-40 wt.%), alkyl ether carboxylic acid (1-12 wt.%), and cationic polysaccharide polymer (0.1-1.5 wt.%). This composite approach leverages the synergistic interactions between different material types to achieve both stability and softness
2Duration of action of stationary object
If multiple wash cycles are performed, then cleaning effectiveness is maintained, but fabric color retention deteriorates
Solution Approach 1:
The patent incorporates cationic polysaccharide polymer (0.1-1.5 wt.%) that provides beforehand cushioning to fabric fibers during washing. This polymer forms a protective layer that cushions against mechanical damage and chemical degradation during multiple wash cycles, thereby preserving color retention while maintaining cleaning effectiveness
3Ease of operation
If fabric softness is enhanced through rinse-added conditioner, then softness is improved, but formulation complexity increases
Solution Approach 1:
The patent merges the detergent and fabric softener functions into a single integrated formulation. The cationic polysaccharide polymer (0.1-1.5 wt.%) serves dual purposes: it contributes to the cleaning mechanism as part of the surfactant system while simultaneously providing fabric softening. This merging eliminates the need for separate rinse-added conditioner, simplifying the overall laundry process while maintaining softness benefits
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 provides improved stability and softening benefits to fabrics over multiple wash cycles while maintaining clarity and effectiveness at desired pH ranges, enhancing fabric softness and color retention.
Implementation Method 1
formulations comprising a nonionic surfactant, an anionic surfactant, an alkyl ether carboxylic acid and a cationic polysaccharide polymer are stable at pH levels of 6.2 to 9
Implementation Method 2
the composition provides improved stability and softening benefits to fabrics over multiple wash cycles
Data Source
AI summary
The present invention relates to a laundry liquid detergent composition comprising (a) nonionic surfactant which comprises an alcohol ethoxylate, (b) anionic surfactant, (c) alkyl ether carboxylic acid or carboxylate salt thereof and (d) a cationic polysaccharide polymer.