Core-Shell Capsules With Polyisocyanate Shells for Fragrance Control
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Solution Overview
Problem
Existing fragrance formulations face issues with fragrance interactions and premature evaporation, leading to unstable olfactory impressions and sensory properties, necessitating improved microcapsule shell structures for controlled release and stability.
Innovation Solution
A core-shell capsule is developed using a polymeric material formed by reacting linear and/or branched aliphatic polyisocyanates with cyclic aliphatic polyisocyanates and a crosslinking agent, providing a shell structure that balances stability and controlled release of fragrances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a polymeric shell material is used to enclose fragrance, then stability and prevention of premature evaporation are improved, but controlled release and sensory properties may be compromised
Solution Approach 1:
The patent uses a composite shell structure made from reacting linear/branched aliphatic polyisocyanates with cyclic aliphatic polyisocyanates and crosslinking agents. This composite material provides both stability to prevent premature evaporation and controlled release properties, resolving the contradiction between reliability and harmful factors.
2Stability of the object's composition
If the shell structure is made more stable to prevent fragrance loss, then fragrance stability is improved, but release control and sensory properties deteriorate
Solution Approach 1:
The patent adjusts the composition parameters of the polymeric material by varying the ratios of linear/branched aliphatic polyisocyanates to cyclic aliphatic polyisocyanates and selecting different crosslinking agents. These parameter changes allow optimization of both fragrance stability and controlled release properties simultaneously.
3Ease of manufacture
If existing polyisocyanate-based shells are used, then manufacturing is simplified, but fragrance interactions and evaporation control are insufficient
Solution Approach 1:
The patent employs a composite polymeric material combining linear/branched aliphatic polyisocyanates with cyclic aliphatic polyisocyanates and crosslinking agents. This composite approach maintains ease of manufacture through established polymerization processes while significantly improving evaporation control and preventing fragrance interactions.
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 combination of aliphatic polyisocyanates with a crosslinking agent results in a shell that prevents premature fragrance release while maintaining stability, allowing for controlled fragrance release under defined conditions, enhancing sensory properties and stability.
Implementation Method 1
the polymeric material is produced or producible by reacting component (A) with component (B), wherein component (A) comprises or consists of at least one linear aliphatic polyisocyanate and/or at least one branched aliphatic polyisocyanate having more than one isocyanate group, respectively, and at least one cyclic aliphatic polyisocyanate having more than one isocyanate group, and component (B) comprises or consists of one or more crosslinking agent(s)
Data Source
AI summary
The present invention relates to core-shell capsules prepared with linear and/or branched and cyclic aliphatic polyisocyanates. In particular, the present invention discloses a core-shell capsule, wherein the shell comprises or consists of a polymeric material which is produced or producible by reacting two components, the first component comprising or consisting of at least one linear aliphatic polyisocyanate and/or at least one branched aliphatic polyisocyanate having more than one isocyanate group, respectively, and at least one cyclic aliphatic polyisocyanate having more than one isocyanate group, the second component comprising or consisting of one or more crosslinking agent(s). Furthermore, a product comprising the present core-shell capsule, a process for producing the present core-shell capsules and the use of the present core-shell capsules is provided.