Laundry Delivery Particle Shell Using Mixed Aromatic Isocyanates
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Solution Overview
Problem
Existing laundry treatment compositions with delivery particles exhibit lower than desired consumer noticeable freshness benefits due to unacceptable levels of perfume leakage when formulated into certain laundry treatments.
Innovation Solution
Incorporating a mixture of di- and/or poly-isocyanates, comprising at least one alpha-aromatic isocyanate and at least one beta-aromatic isocyanate, in the shell of the delivery particles to reduce perfume leakage and enhance freshness retention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a cross-linking agent comprising an isocyanate component is used in the shell of delivery particles, then the structural integrity and durability of the particle is improved, but perfume leakage increases resulting in lower freshness benefits
Solution Approach 1:
The patent changes the chemical parameters of the isocyanate component by specifying particular types (toluene diisocyanate, methylene diphenyl diisocyanate, xylylene diisocyanate) and their ratios in the cross-linking agent formulation. This parameter optimization allows the shell to achieve both structural integrity and reduced perfume leakage by controlling the density and distribution of cross-linking bonds in the polymer network.
Solution Approach 2:
The patent creates a composite shell structure combining chitosan (a natural polymer) with synthetic isocyanate cross-linking agents. This composite material approach leverages the biocompatibility and film-forming properties of chitosan while using the isocyanate to create a dense cross-linked network that simultaneously provides strength and prevents perfume migration.
2Ease of operation
If the delivery particles are formulated into laundry treatment compositions, then the practical application and consumer benefit is improved, but perfume leakage becomes unacceptable reducing freshness benefits
Solution Approach 1:
The patent optimizes the chemical composition parameters of the shell by selecting specific isocyanate types and ratios that maintain particle integrity during the mechanical stresses of laundry treatment applications. This parameter control ensures that the particles remain stable in detergent formulations while preventing perfume leakage during washing cycles.
3Loss of substance
If a mixture of di- and/or poly-isocyanates comprising alpha-aromatic and beta-aromatic isocyanates is used, then perfume leakage is reduced and freshness benefits are improved, but the complexity of the cross-linking agent formulation increases
Solution Approach 1:
The patent segments the isocyanate component into distinct functional categories (alpha-aromatic and beta-aromatic isocyanates) with specific examples provided for each. This segmentation approach allows formulators to understand and control the contribution of each isocyanate type to the overall shell performance, making the complex formulation more manageable and predictable.
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 modified delivery particles achieve consumer-acceptable freshness benefits across various laundry treatment compositions by minimizing perfume leakage and ensuring consistent fragrance delivery to fabrics.
Implementation Method 1
the shell comprises a polymeric material that is the reaction product of chitosan wherein the reaction product of chitosan is derived from an aqueous phase, and a cross-linking agent, wherein the cross-linking agent comprises an isocyanate component
Data Source
AI summary
A laundry treatment composition includes a delivery particle. The delivery particle includes a core and shell surrounding the core, and the core includes a perfume and the shell includes a polymeric material that is the reaction product of chitosan. The reaction product of chitosan is derived from an aqueous phase and a cross-linking agent. The cross-linking agent includes an isocyanate component, the isocyanate component including a mixture of two or more di- and/or poly-isocyanates, derived from an oil phase, the di- and/or poly-isocyanates each including an aromatic moiety; and the mixture of di- and/or poly-isocyanates including an aromatic moiety includes at least one alpha-aromatic isocyanate and at least one beta-aromatic isocyanate.