Perfume Delivery Particles With Ester Cores for Capsule Stability
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Solution Overview
Problem
Existing delivery particles with polymeric shells made from amine-containing biopolymers face challenges in encapsulating perfume raw materials containing aldehydes, leading to weak and leaky capsules, particularly when using chitosan-based shells.
Innovation Solution
The use of ester-containing perfume raw materials in the core, combined with a polymeric shell formed from a reaction product of a biopolymer with a cross-linking agent, including primary amine groups, reduces interactions and enhances capsule stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If aldehyde-containing perfume raw materials are encapsulated in polymeric shells made from amine-containing biopolymers (such as chitosan), then the shells can be formed through cross-linking reactions, but the aldehyde groups react with the amine groups resulting in weak and leaky capsules
Solution Approach 1:
The patent changes the chemical composition parameters of the fragrance material by specifying minimum percentages of ester-containing PRMs (at least 30% by weight) and aldehyde-containing PRMs (at least 0.5% by weight), along with specific S-ESTER value requirements (average at least 5, or at least 30% of PRMs having S-ESTER values of 13 or greater). These parameter changes optimize the chemical interaction between fragrance and shell materials to prevent unwanted reactions while maintaining encapsulation effectiveness.
2Reliability
If ester-containing perfume raw materials are used in the core with amine-containing biopolymer shells, then interactions between shell and fragrance are minimized, but the complexity of fragrance formulation increases
Solution Approach 1:
The patent establishes specific quantitative parameters for the fragrance material composition, including minimum weight percentages of ester-containing (at least 30%) and aldehyde-containing (at least 0.5%) PRMs, as well as minimum S-ESTER value thresholds (average at least 5). These parameter specifications provide a systematic framework that guides fragrance formulation while ensuring optimal performance and stability.
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 selected fragrance materials improve freshness performance by minimizing reactions with amine groups, resulting in more stable and effective delivery particles.
Implementation Method 1
the shell comprises a polymeric material, where the polymeric material includes a reaction product of a biopolymer and a cross-linking agent, where the biopolymer includes primary amine groups
Implementation Method 2
The selected fragrance materials improve freshness performance by minimizing reactions with amine groups
Data Source
AI summary
A composition comprising a population of core/shell delivery particles, where the shell includes a polymeric material formed from a cross-linked amine-containing biopolymer, and where the core includes a fragrance material that includes ester-containing perfume raw materials. Related methods of making and using such compositions.