Water-Soluble Unit-Dose Liquid Composition for Stable Perfume Delivery
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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 liquid composition comprising alcohol alkoxylated nonionic surfactants, non-aqueous solvents like polyglycerol and alkoxylated polyol esters, and ethylene oxide-propylene oxide triblock copolymers is used to create a first compartment in a water-soluble film, reducing perfume leakage and enhancing stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If perfume capsules are used in laundry compositions, then perfume protection and controlled release are improved, but perfume leakage from capsules occurs
Solution Approach 1:
A non-aqueous solvent system comprising polyglycerol and alkoxylated polyol esters is introduced as an intermediary medium between the perfume capsules and the aqueous laundry composition. This solvent system creates a compatible environment that prevents direct water-capsule interaction causing leakage, while maintaining the encapsulated perfume's integrity until the intended release point during washing.
Solution Approach 2:
The patent modifies the physical and chemical parameters of the laundry composition by incorporating specific non-aqueous solvents with controlled hydrophobicity and viscosity. These parameter changes create a less aggressive environment for the perfume capsules, reducing the driving force for leakage while preserving the capsules' ability to release perfume under washing conditions.
2Duration of action of moving object
If perfume capsules are used in laundry compositions, then after-wash freshness is improved, but oxidation of perfume ingredients and other actives occurs
Solution Approach 1:
The non-aqueous solvent system acts as an inert environment that excludes oxygen and water from direct contact with the perfume ingredients and other active components. This inert atmosphere prevents oxidative reactions that would otherwise degrade the perfume compounds and reduce the duration of freshness delivery.
Solution Approach 2:
The alkoxylated polyol esters and polyglycerol serve as intermediary substances that physically separate the perfume capsules and other actives from oxidizing agents in the aqueous environment. This mediation protects the sensitive ingredients while allowing the composition to function as intended during the washing process.
3Manufacturing precision
If water-soluble unit-dose articles are used, then dosage precision and convenience are improved, but perfume leakage and ingredient instability increase
Solution Approach 1:
The patent carefully adjusts the concentration and molecular weight parameters of the non-aqueous solvents to achieve optimal compatibility with the water-soluble film matrix. This parameter optimization ensures that the film remains stable during storage and handling, preventing premature capsule damage and ingredient degradation while maintaining precise dosage delivery.
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 wherein the first liquid composition comprises:i) from more than 16% to 90% by weight of the first composition of an alcohol alkoxylated nonionic surfactant;ii) from 1 to 50% by weight of the first liquid composition of perfume capsules;iii) from 1 to 25% by weight of the first liquid composition of water; andiv) less than 5% by weight of the first liquid composition of anionic surfactant.