Laundry Detergent Composition with Polyglucosamine for Fabric Softness
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Solution Overview
Problem
Existing laundry detergents often fail to maintain fabric softness, especially after multiple wash and wear cycles, despite the use of rinse-added conditioners and softening systems.
Innovation Solution
A laundry detergent composition comprising nonionic and anionic surfactants, combined with an alkyl ether carboxylic acid or its salt and a polyglucosamine or copolymer of glucosamine and N-acetylglucosamine, delivered in an aqueous emulsion, which provides improved softening during the wash process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If rinse-added conditioners and softening systems are used, then fabric softness is improved, but fabric softness deteriorates after multiple wash and wear cycles
Solution Approach 1:
The patent combines polyglucosamine (a cationic polymer) with alkyl ether carboxylic acid or its salt (anionic surfactant) in a single detergent composition, creating a synergistic effect that provides both immediate softness and durable softness retention through multiple wash cycles, eliminating the need for separate rinse-added conditioners
Solution Approach 2:
The invention uses a composite formulation consisting of polyglucosamine and alkyl ether carboxylic acid/salt in specific ratios (1:4 to 4:1), creating a composite material that leverages the cationic properties of polyglucosamine for fabric binding and the anionic surfactant properties for cleaning and softening, achieving prolonged softness duration
2Strength
If polyglucosamine and alkyl ether carboxylic acid are used in specific ratios, then fabric softness is significantly improved, but formulation complexity increases
Solution Approach 1:
The patent optimizes specific parameter ranges for polyglucosamine (0.1-10 wt%, preferably 0.5-5 wt%) and alkyl ether carboxylic acid/salt (1-15 wt%, preferably 2-7.5 wt%) to achieve maximum softening effect while maintaining formulation simplicity and cost-effectiveness
Solution Approach 2:
The combined polyglucosamine and alkyl ether carboxylic acid/salt system performs multiple functions simultaneously: cleaning (anionic surfactant action), softening (cationic-anionic interaction), and anti-static properties (cationic polymer action), reducing the need for multiple separate additives
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 significantly enhances fabric softness, as demonstrated by improved rankings in softness tests, even when used in conjunction with a standard laundry detergent.
Implementation Method 1
a polyglucosamine or a copolymer of glucosamine and N-acetylglucosamine
Implementation Method 2
an alkyl ether carboxylic acid or carboxylate salt thereof
Data Source
AI summary
The present invention relates to a laundry detergent composition comprising (a) nonionic surfactant, (b) anionic surfactant, (c) alkyl ether carboxylic acid or carboxylate salt thereof, and, (d) a polyglucosamine or a copolymer of glucosamine and N-acetylglucosamine; and to its use to soften fabrics.