Cationic Polymer Mediator for Hydrophilic Perfume Deposition
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Solution Overview
Problem
Current laundry detergent compositions have difficulty in effectively depositing hydrophilic perfume ingredients onto cotton fabrics, leading to reduced residuality and freshness over multiple wash cycles.
Innovation Solution
A liquid laundry detergent composition incorporating a surfactant system and a cationic polymer, specifically poly(diallyldimethylammonium chloride) or its copolymers, which enhances the deposition of hydrophilic perfume ingredients like allyl amyl glycolate and anisic aldehyde onto cotton fabrics, improving their residuality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If hydrophilic perfume ingredients are added to liquid laundry detergent composition, then the desired odour profile is achieved, but the perfume ingredients remain suspended in the wash solution and do not readily deposit onto cotton-comprising fabrics
Solution Approach 1:
The patent introduces a cationic polymer as an intermediary substance that mediates between the hydrophilic perfume ingredients and the cotton fabric. The cationic polymer binds to the negatively charged cotton fibres and simultaneously associates with the hydrophilic perfume ingredients, enabling their deposition onto the fabric surface. This intermediary mechanism allows perfume ingredients that would otherwise remain suspended in the wash solution to effectively deposit and persist on cotton fabrics.
2Quantity of substance
If more hydrophilic perfume ingredients are added to provide desired odour profile, then the odour detection threshold is met, but the residuality and accumulation over multiple wash cycles is reduced
Solution Approach 1:
The patent creates a composite deposition system consisting of the cationic polymer and hydrophilic perfume ingredients working together on the fabric surface. This composite approach allows the perfume ingredients to benefit from the fabric-substantive properties of the cationic polymer, thereby extending their residence time on the fabric. The synergistic interaction between the polymer and perfume creates a more stable and long-lasting fragrance deposit that accumulates effectively over multiple wash cycles.
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 improves the deposition and residuality of hydrophilic perfume ingredients on cotton fabrics, resulting in enhanced freshness and longevity over multiple washes.
Implementation Method 1
the composition comprises a cationic polymer and a non-encapsulated perfume, wherein the surfactant system comprises surfactant at a level of from 1.0 wt% to 70 wt% of the composition
Implementation Method 2
the cationic polymer is selected from: poly (diallyldimethylammonium chloride); copolymer of diallyldimethylammonium chloride and acrylic acid
Data Source
AI summary
The need for laundry detergent compositions that provide improved deposition of hydrophilic perfume ingredients onto fabrics comprising cotton fibres, and especially those perfume ingredients that deposit less readily onto cotton fibres, is met by incorporating certain cationic polymers and specific perfume ingredients into a laundry detergent composition.