Liquid Detergent Composition with Cationic Polysaccharide for Fabric Softening
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Solution Overview
Problem
Current laundry softening systems fail to provide consistently improved softness and stability to fabrics across multiple wash cycles, leading to harsh fabric feel and color loss.
Innovation Solution
A liquid detergent composition comprising nonionic surfactant, anionic surfactant, fatty acid or salt, and cationic polysaccharide-based polymer, with a specific weight ratio of nonionic to anionic surfactant between 1.25:1 and 2.25:1, and a total surfactant level of at least 25 wt.%, which is applied during the main wash and allows fabrics to dry or tumble-dry for enhanced softening and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If conventional laundry softening systems are used, then some softening effect is achieved, but the softness is not consistent across multiple wash cycles and fabric stability deteriorates
Solution Approach 1:
The patent combines cationic polysaccharide-based polymer with anionic surfactant to form a composite softening system. This composite approach creates synergistic effects where the cationic polymer provides consistent softening across wash cycles while the anionic surfactant enhances stability, resolving the contradiction between consistent softness and fabric stability.
Solution Approach 2:
The patent specifies precise parameter ranges: cationic polysaccharide polymer at 0.1-5% by weight, anionic surfactant at 1-20% by weight, and a weight ratio of cationic polymer to anionic surfactant from 1:10 to 5:1. These controlled parameter changes ensure both consistent softness and fabric stability across multiple wash cycles.
2Ease of operation
If higher levels of softening agents are used, then improved softening is achieved, but fabric wear and color loss increase
Solution Approach 1:
The patent optimizes the concentration parameters of softening agents to achieve the softest fabric feel without excessive wear. The cationic polysaccharide polymer is used at 0.1-5% and anionic surfactant at 1-20%, with specific weight ratios that maximize softness while minimizing harmful effects on fabric integrity and color retention.
Solution Approach 2:
The patent utilizes the electrostatic attraction between cationic polysaccharide polymer and anionic surfactant, which normally could cause instability, to create a stable complex that deposits evenly on fabric. This converts the potential harmful interaction into a beneficial mechanism for consistent softness application without increased wear.
3Ease of operation
If cationic polymer and anionic surfactant are combined, then softening effect is enhanced, but formulation stability becomes difficult to maintain
Solution Approach 1:
The patent defines specific parameter ranges and ratios that stabilize the cationic-anionic combination: cationic polysaccharide polymer at 0.1-5% by weight, anionic surfactant at 1-20% by weight, and a weight ratio from 1:10 to 5:1. These controlled parameters prevent phase separation and maintain formulation stability while preserving the enhanced softening effect.
Solution Approach 2:
The patent creates a stable composite system where cationic polysaccharide polymer and anionic surfactant form a compatible combination. This composite approach, with specifically controlled ratios and concentrations, resolves the instability issue while maintaining the synergistic softening effect of the combined components.
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 delivers superior fabric softening, reduces wear and pilling, and provides antistatic benefits, maintaining fragrance and color retention, while maintaining stability and effectiveness over multiple washes.
Implementation Method 1
a liquid detergent composition comprising nonionic surfactant, anionic surfactant, fatty acid or salt, and cationic polysaccharide-based polymer
Implementation Method 2
nonionic surfactant, anionic surfactant
Data Source
AI summary
The present invention relates to a liquid detergent composition comprising at least 25 wt.% surfactant, comprising (a) nonionic surfactant, (b) anionic surfactant, (c) fatty acid or salt thereof and (d) a cationic polysaccharide-based polymer, wherein weight ratio of (a) to (b) is from 1.25:1 to 2.25:1; the composition being useful in providing fabric softness during laundering.