Dual-Shell Benefit Agent Capsules for Leakage-Controlled Release
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Solution Overview
Problem
Encapsulated benefit agents, such as perfumes, often experience leakage over time, leading to instability and performance issues in formulations, including loss of intensity and timing in perfume delivery.
Innovation Solution
The development of particles with an outer crosslinked shell made of hydrophobically modified polyvinyl alcohol and an inner polyamide shell, where the outer shell is formed prior to the inner polyamide shell, providing improved deposition efficiency and benefit delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If encapsulation is used to deliver benefit agents, then delivery enhancement is achieved, but leakage of the benefit agent occurs over time
Solution Approach 1:
The invention uses a composite shell structure comprising polyamide and crosslinked mPVOH materials. The polyamide provides initial encapsulation and the crosslinked mPVOH layer provides enhanced barrier properties. This composite approach combines the benefits of different materials to achieve both delivery enhancement and leakage prevention.
Solution Approach 2:
The invention employs thin film encapsulation technology to create a protective barrier around the benefit agent. The shell is designed to be sufficiently thin to allow controlled delivery while maintaining integrity to prevent leakage. The crosslinked mPVOH forms a flexible yet protective film that balances delivery and retention requirements.
2Reliability
If encapsulation is used to deliver benefit agents, then delivery enhancement is achieved, but instability and performance issues occur in formulations
Solution Approach 1:
The composite shell structure with polyamide and crosslinked mPVOH provides enhanced chemical and physical stability. The crosslinked network of mPVOH creates a more robust barrier that resists degradation in formulation environments, preventing premature release and maintaining formulation stability throughout the product lifecycle.
Solution Approach 2:
The invention modifies the shell material parameters by introducing crosslinking to the mPVOH polymer structure. This crosslinking changes the physical and chemical properties of the shell, increasing its resistance to degradation, reducing permeability, and enhancing overall stability in various formulation conditions while maintaining controlled delivery capabilities.
3Ease of manufacture
If single-shell encapsulation is used, then manufacturing is simpler, but deposition efficiency is lower
Solution Approach 1:
The encapsulation system is segmented into two distinct functional layers: an inner polyamide shell and an outer crosslinked mPVOH shell. Each layer performs specific functions - the polyamide provides initial encapsulation and the mPVOH provides enhanced barrier and deposition properties. This segmentation allows optimization of each layer for its specific purpose while maintaining manufacturing feasibility through sequential formation processes.
Solution Approach 2:
The invention employs a nested shell structure where the crosslinked mPVOH shell is formed around the polyamide shell. This nested configuration allows both shells to work together synergistically, with the inner shell providing primary encapsulation and the outer shell enhancing deposition efficiency and providing additional barrier protection, all within a single integrated particle structure.
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 described particle structure enhances the retention of benefit agents during storage and allows for controlled release, reducing leakage and maintaining perfume intensity and timing, while also using renewable materials to minimize environmental impact.
Implementation Method 1
an outer crosslinked shell, which comprises a crosslinked, hydrophobically modified polyvinyl alcohol
Implementation Method 2
an outer crosslinked shell, which comprises a crosslinked, hydrophobically modified polyvinyl alcohol
Data Source
AI summary
A process for the preparation of a particle, wherein the particle comprises: (a) a core comprising a hydrophobic benefit agent; (b) an outer crosslinked shell, which comprises a crosslinked, hydrophobically modified polyvinyl alcohol, which comprises a crosslinking agent comprising a first dextran aldehyde having a molecular weight of from 2,000 to 2,000,000 Da; and (c) an inner polyamide shell, wherein the shell comprises a polyamide, and wherein the polyamide comprises an aromatic group; wherein the outer crosslinked shell is formed prior to the formation of the inner polyamide shell.