Water-Soluble Unit-Dose Composition for Stable Perfume Capsules
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Solution Overview
Problem
Laundry compositions with perfume capsules face issues of perfume leakage and oxidation of ingredients, particularly in water-soluble unit-dose articles, which affect the availability and stability of perfumes and other components.
Innovation Solution
A unit-dose article comprising a water-soluble film with a liquid composition containing glycerol, polypropylene glycol, and ethylene oxide-propylene oxide triblock copolymers, along with alcohol alkoxylated nonionic surfactants, to reduce perfume leakage and maintain composition stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If perfume capsules are used in water-soluble unit-dose articles, then perfume delivery is improved, but perfume leakage from capsules increases
Solution Approach 1:
A non-aqueous solvent system comprising polypropylene glycol (PPG), ethylene oxide-propylene oxide triblock copolymer (EO-PO-EO), and glycerol is introduced as an intermediary medium between the perfume capsules and the water-soluble film. This solvent system reduces capsule wall plasticization and maintains capsule structural integrity during storage, thereby minimizing perfume leakage while ensuring reliable perfume delivery upon activation.
Solution Approach 2:
The patent modifies the chemical composition parameters of the liquid composition by incorporating a specific non-aqueous solvent system with controlled ratios of PPG (5-50 wt%), EO-PO-EO copolymer (5-40 wt%), and glycerol (5-30 wt%). These parameter changes alter the interaction between the liquid composition and capsule walls, reducing unwanted perfume migration while maintaining system compatibility.
2Reliability
If perfume capsules are used in water-soluble unit-dose articles, then perfume encapsulation is achieved, but oxidation of perfume ingredients and other components occurs
Solution Approach 1:
The non-aqueous solvent system creates a low-water-activity environment that acts as an inert barrier, reducing oxidative reactions between perfume ingredients and oxygen. The hydrophobic nature of PPG and EO-PO-EO copolymer minimizes water availability that would otherwise promote oxidation, thereby protecting both encapsulated and free perfume ingredients from degradation.
Solution Approach 2:
The solvent system serves as a protective intermediary layer between oxygen and susceptible ingredients, reducing direct contact and oxidative interactions while maintaining the functionality of the water-soluble unit-dose article.
3Manufacturing precision
If water-soluble unit-dose articles are used, then dosing precision is improved, but design constraints and compatibility issues increase
Solution Approach 1:
The non-aqueous solvent system performs multiple functions simultaneously: it acts as a capsule wall protector, oxidation inhibitor, film plasticizer, and compatibility enhancer. This multi-functionality reduces the need for additional separate components, simplifying the overall formulation while maintaining dosing precision in water-soluble unit-dose articles.
Solution Approach 2:
By adjusting the composition parameters of the non-aqueous solvent system, the patent optimizes multiple performance characteristics simultaneously, including capsule stability, film solubility, and ingredient compatibility, thereby reducing design constraints associated with water-soluble unit-dose formulations.
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 solution effectively minimizes perfume leakage and prevents oxidation, ensuring consistent perfume delivery and composition integrity in water-soluble unit-dose articles.
Implementation Method 1
the leakage of perfume from capsules in liquid laundry compositions is often caused by the plasticization of the capsule walls
Implementation Method 2
Another negative effect can be that the perfume ingredients, can oxidize other ingredients of the laundry composition
Data Source
AI summary
A unit-dose article comprising a water-soluble film creating a first compartment and a second compartment, wherein the first compartment comprises a first liquid composition comprising: i) from 5 to 90% by weight of the first liquid composition of: glycerol wherein the composition is free of polyethylene glycol having a number average molecular weight of from 200 Da to 1000 Da; or glycerol and polyethylene glycol, having a number average molecular weight of from 200 Da to 1000 Da, in a weight ratio of at least 1.5, preferably at least 2; ii) from 1 to 50% by weight of the first liquid composition of perfume capsules; and iii) from 1 to 25% by weight of the first liquid composition of water; and iv) less than 5% by weight of the first liquid composition of anionic surfactant.