Hybrid Perfume Microcapsule Shells for Retention and Burst Release
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Solution Overview
Problem
The perfumery industry faces challenges with rapid degradation and loss of olfactory benefits from odoriferous compounds due to their chemical structure and volatility, as well as the need for controlled release of fragrances, which existing core-shell microcapsules fail to address effectively in terms of stability, mechanical properties, and perfume retention.
Innovation Solution
A polyalkoxysilane macro-monomeric composition is used to form organic-inorganic hybrid microcapsules through hydrolysis and condensation, allowing for improved mechanical properties and perfume retention, enabling controlled release of fragrances while maintaining stability across a wide pH range and reducing residual monomers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If polymeric materials such as melamine-formaldehyde or polyurea are used to make microcapsule membranes, then long-lastingness for perfume compositions is improved, but residual monomers are present and storage stability is limited
Solution Approach 1:
The patent uses a composite shell structure combining inorganic silicate materials with organic polymers. The silicate layer is formed by hydrolysis and condensation of alkoxysilanes, creating a hybrid membrane that eliminates residual monomers while maintaining perfume release properties and improving storage stability.
Solution Approach 2:
The patent changes the chemical composition parameters of the shell by using silicate-based materials instead of traditional polymeric materials. This parameter change transforms the membrane chemistry to eliminate residual monomers while maintaining or improving perfume retention and storage stability.
2Reliability
If microcapsule shells are optimized for stability, then storage stability is improved, but mechanical robustness increases making capsules difficult to break during application
Solution Approach 1:
The patent creates a shell with non-uniform local properties by forming a silicate layer with specific porosity and mechanical characteristics that differ from the core polymer structure. This local quality differentiation allows the shell to be stable during storage yet mechanically vulnerable during rubbing application.
Solution Approach 2:
The patent employs a porous silicate shell structure formed by controlled hydrolysis and condensation. The porosity provides pathways for perfume diffusion while the silicate network maintains structural stability during storage but allows mechanical breakdown during rubbing application.
3Reliability
If silane monomers such as tetraethoxysilane are used to prepare inorganic microcapsules, then residual monomer content is reduced, but membrane porosity remains high resulting in poor perfume retention
Solution Approach 1:
The patent changes the porosity parameter of the silicate shell by controlling hydrolysis and condensation conditions, cross-linking density, and shell thickness. These parameter adjustments reduce membrane porosity to appropriate levels that retain perfume molecules while maintaining the low residual monomer advantage of silicate materials.
Solution Approach 2:
The patent creates a dynamic shell structure where porosity and permeability are controlled by the degree of silicate condensation. The shell transitions from a highly porous initial structure to a more dense final structure through controlled hydrolysis and condensation, optimizing both perfume retention and release properties.
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 resulting microcapsules exhibit enhanced perfume retention and mechanical properties, allowing for a burst release upon gentle rubbing, thereby improving fragrance longevity and intensity in consumer products.
Implementation Method 1
A polyalkoxysilane macro-monomeric composition is used to form organic-inorganic hybrid microcapsules through hydrolysis and condensation
Implementation Method 2
A polyalkoxysilane macro-monomeric composition is used to form organic-inorganic hybrid microcapsules through hydrolysis and condensation
Data Source
AI summary
The present invention relates to organic-inorganic hybrid core-shell microcapsules encapsulating an active ingredient such as a perfume and having a shell made from the hydrolysis and condensation reaction of particular polyalkoxysilane macro-monomeric compositions.