Core-Shell Perfume Particles via High-Solids Emulsion Polymerization
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Solution Overview
Problem
Existing perfume deposition methods in laundry detergents face inefficiencies due to poor retention and stability of perfumes in carriers, leading to significant loss during washing, as surfactants readily combine with perfumes, resulting in inadequate and short-lived fragrance on fabrics.
Innovation Solution
A one-vessel emulsion polymerization process is developed to create core-shell perfume particles with a nonionic deposition aid, achieving a solids content above 25%wt, which significantly improves perfume deposition and retention on fabrics by ensuring the deposition aid is predominantly attached to the particle surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If perfume is incorporated into a carrier system based on encapsulation or entrapment, then perfume retention is improved, but deposition efficiency deteriorates due to poor stability and inefficient deposition onto fabric
Solution Approach 1:
The perfume carrier system is segmented into distinct functional components: a core material for entrapment, a nonionic deposition aid for efficient fabric deposition, and optional shell layers for controlled release. This segmentation allows each component to optimize its specific function without interfering with others, resolving the contradiction between retention and deposition efficiency.
Solution Approach 2:
Different regions of the carrier system are assigned different properties: the core provides retention through encapsulation, the surface is modified with nonionic deposition aid for efficient fabric deposition, and shell layers can provide controlled release characteristics. This local differentiation allows simultaneous optimization of retention and deposition efficiency.
2Productivity
If surfactants are used in laundry detergents, then cleaning effectiveness is improved, but perfume stability deteriorates as surfactants combine with perfumes causing loss during washing
Solution Approach 1:
The nonionic deposition aid acts as an intermediary between the perfume core and the fabric, facilitating deposition without forming strong associations that would cause perfume loss. The encapsulation structure serves as a mediator protecting the perfume from direct interaction with surfactants in the detergent, allowing cleaning effectiveness while maintaining perfume stability.
Solution Approach 2:
The carrier system employs shell layers that can control the release and protection of the perfume core. These flexible shell structures protect the perfume from surfactant interaction while allowing controlled deposition onto fabric, resolving the conflict between cleaning effectiveness and perfume stability.
3Productivity
If complex preparation processes are used for perfume diffusion into carriers, then diffusion efficiency is improved, but manufacturing complexity increases due to required diffusion time
Solution Approach 1:
The perfume is incorporated into the carrier system during the manufacturing process itself, rather than requiring separate diffusion steps after carrier preparation. The core material is formed with perfume already integrated, and the nonionic deposition aid is incorporated during the same process, eliminating the need for complex post-processing diffusion steps.
Solution Approach 2:
Multiple functions are merged into a single integrated manufacturing process: core formation, perfume entrapment, and deposition aid incorporation are all achieved in one process sequence. This consolidation maintains diffusion efficiency while significantly reducing manufacturing complexity compared to multi-step processes.
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
This process enhances perfume deposition efficiency from 30% to 75% retention during washing, reducing particle loss and maintaining fragrance longevity, while also simplifying the manufacturing process and reducing costs.
Implementation Method 1
a one-vessel emulsion polymerization process is developed to create core-shell perfume particles
Implementation Method 2
a nonionic deposition aid, achieving a solids content above 25%wt, which significantly improves perfume deposition and retention on fabrics by ensuring the deposition aid is predominantly attached to the particle surface
Data Source
AI summary
The invention relates to a process for the manufacture of core-shell perfume particles by emulsion polymerisation and to the products obtainable by such a process. The core of the particles comprises a perfume and the shell (which preferably comprises an aminoplast polymer) also comprises a non-ionic deposition aid (such as locust bean gum) which is substantive to textiles. The process of the invention is characterised in that, during the emulsion polymerisation step, the solids content of the polymerisation mixture does not fall below 25%wt. The particles obtained by the process are suitable for inclusion in laundry products and show significantly improved deposition and retention onto fabrics being laundered as compared with particles formed at lower solids levels.