Core-Shell Microcapsule Stabilizer for Deposition and Polydispersity Control
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Solution Overview
Problem
Existing encapsulated perfume compositions face challenges in achieving stable microcapsule deposition and retention on treated surfaces, particularly under rinse-off conditions, due to polydispersity issues in core-shell microcapsules, which affects their leakage stability and release performance.
Innovation Solution
The use of novel polymeric stabilizers, specifically the reaction product of a polymeric surfactant and a silane with functional groups capable of forming covalent bonds, to control polydispersity and stabilize the oil-water interface, resulting in core-shell microcapsules with improved deposition and retention properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional polymeric stabilizers are used in oil-in-water emulsions, then microcapsules can be formed, but the microcapsules exhibit high polydispersity which limits deposition and retention on treated surfaces
Solution Approach 1:
The patent changes the chemical parameters of the stabilizer by using silane-modified polymeric surfactants instead of conventional polymeric stabilizers. This parameter change enables covalent bonding to the shell and produces microcapsules with reduced polydispersity and improved deposition properties.
Solution Approach 2:
The patent employs composite stabilizer molecules that combine polymeric surfactant structures with silane functional groups. This composite approach allows the stabilizer to perform both emulsification and covalent bonding functions, resulting in microcapsules with controlled size distribution and enhanced surface retention.
2Reliability
If chemical modification of microcapsule shell is performed to enhance deposition, then deposition may improve, but leakage stability is adversely affected
Solution Approach 1:
The patent separates the deposition function from the shell structure by introducing a distinct stabilizer component. The silane-modified polymeric surfactant acts as a separate functional layer that provides deposition enhancement without compromising the integrity and leakage stability of the core shell structure.
Solution Approach 2:
The silane-modified polymeric surfactant serves as an intermediary between the microcapsule shell and the substrate. It mediates the interaction by providing covalent bonding capability for enhanced deposition while maintaining the shell's leakage stability through its stabilizing作用 at the oil-water interface.
3Stability of the object's composition
If microcapsules are made robust for storage stability, then leakage during storage improves, but breakability in use during cleaning operations deteriorates
Solution Approach 1:
The patent utilizes the dual nature of silane chemistry by controlling the crosslinking density and reaction conditions. This parameter control allows the shell to achieve optimal balance between storage stability and in-use breakability, where sufficient crosslinking provides storage stability while controlled porosity and bond strength enable breakability during cleaning operations.
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 novel polymeric stabilizers enable the production of microcapsules with high perfume loading, high encapsulation yield, and balanced stability-to-release performance, characterized by small particle size and low polydispersity, enhancing their substantive nature on surfaces and breakability for effective fragrance delivery.
Implementation Method 1
a silane with functional groups capable of forming covalent bonds
Implementation Method 2
the reaction product of a polymeric surfactant and a silane
Implementation Method 3
deposition and anchoring of core-shell microcapsules on treated substrates
Data Source
AI summary
An encapsulated perfume composition comprising a slurry of core-shell microcapsules in a suspending medium, the core comprising at least one perfume ingredient, and the shell comprising a thermosetting resin formed by the reaction of shell-forming materials selected from monomers, pre-polymers and/or pre-condensates, and wherein the encapsulated perfume composition comprises a polymeric stabilizer that is a reaction product of a polymeric surfactant, and a silane that contains functional groups capable of forming covalent bonds with the shell.