Microcapsule Shell Composition for Leakage Prevention
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Solution Overview
Problem
There is a need for environmentally friendly consumer products with stable fragrance delivery systems that prevent leakage and physical separation of hydrophobic materials during storage, while maintaining olfactory properties and stability.
Innovation Solution
An aqueous dispersion of microcapsules with a hydrophobic core enclosed in a polymeric shell formed from multifunctional α,β-unsaturated carbonyl compounds, nanocellulose or microcrystalline cellulose, and optional monoethylenically α,β-unsaturated carbonyl compounds, thiol compounds, and silyl acrylate compounds, where the weight ratio of multifunctional α,β-unsaturated carbonyl compounds to nanocellulose or microcrystalline cellulose is ≤1, is developed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional microencapsulation methods are used to protect and control delivery of hydrophobic materials, then protection and controlled delivery are achieved, but leakage of hydrophobic core material occurs during storage
Solution Approach 1:
The patent uses a composite polymeric shell formed from the reaction product of multifunctional α,β-unsaturated carbonyl compound, nanocellulose or microcrystalline cellulose, and optionally other compounds. This composite structure combines the protective properties of the carbonyl compound-based polymer with the structural integrity and stability of cellulose, creating a shell that effectively prevents leakage of the hydrophobic core material while maintaining controlled delivery capabilities.
2Reliability
If stability is improved upon storage, then protection against leakage is enhanced, but physical separation (creaming or sedimenting) occurs
Solution Approach 1:
The patent optimizes the weight ratio between the multifunctional α,β-unsaturated carbonyl compound and nanocellulose or microcrystalline cellulose to be lower or equal to 1. This specific parameter change in the composition creates a balanced shell structure that provides adequate stability upon storage while maintaining homogeneous dispersion and preventing physical separation such as creaming or sedimenting.
3Object-affected harmful factors
If biodegradable and bio-based materials are used, then environmental friendliness is improved, but manufacturing complexity increases
Solution Approach 1:
The patent introduces nanocellulose or microcrystalline cellulose as a specific component within the polymeric shell structure. This localized incorporation of bio-based material provides environmental friendliness and biodegradability at the shell composition level, while the overall manufacturing process remains compatible with conventional microencapsulation techniques, balancing eco-friendliness with manufacturing feasibility.
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 solution provides biodegradable and bio-based microcapsules with improved stability and reduced leakage, maintaining fragrance delivery and preventing physical separation, thus enhancing the performance of consumer products.
Implementation Method 1
Chemically formed capsules are produced by chemical reactions forming ionic or covalent bonds using techniques such as co-acervation, interfacial polymerisation, condensation reactions and free radical polymerisation
Implementation Method 2
Chemically formed capsules are produced by chemical reactions forming ionic or covalent bonds using techniques such as co-acervation, interfacial polymerisation, condensation reactions and free radical polymerisation
Implementation Method 3
improved stability performance against physical separation (creaming or sedimenting) upon storage
Data Source
AI summary
The invention relates to an aqueous dispersion of microcapsules, said microcapsules comprising a hydrophobic core and a polymeric shell wherein said polymeric shell is formed of the reaction product of (i) at least one monofunctional or multifunctional α,β-unsaturated carbonyl compound, and (ii) at least one nanocellulose or microcrystalline cellulose. The invention also relates to a process for the manufacture of such an aqueous dispersion, as well as consumer products containing an aqueous dispersion of microcapsules according to the invention.