Biosourced Polymer Shell Dispersion Stability
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Solution Overview
Problem
There is a growing demand for cosmetic compositions that are free from silicone compounds due to environmental and health concerns, and consumers seek biosourced alternatives that maintain the kinetic stability and properties of silicone-based dispersions, particularly in macroscopic dispersions.
Innovation Solution
A dispersion comprising a fatty phase and an aqueous phase with drops coated by an anionic and cationic polymer shell, where the cationic polymer follows a specific formula, providing kinetic stability and replacing silicone compounds like amodimethicone with a biosourced option.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If amodimethicone is used to stabilize dispersions, then kinetic stability and adhesion properties are improved, but environmental compatibility and biosourcing are worsened
Solution Approach 1:
The invention changes the chemical composition parameters by replacing silicone-based amodimethicone with a biosourced cationic polymer containing long-chain alkyl groups (C20-C50) combined with amino groups. This parameter change maintains the cationic charge density and hydrophobic interactions necessary for kinetic stability while eliminating environmental harm associated with non-biodegradable silicones.
Solution Approach 2:
The invention adopts a biosourced, biodegradable polymer that can be naturally decomposed, replacing the persistent silicone compound. This approach uses a material that is environmentally friendly and can be degraded by natural processes, thus resolving the contradiction between stability performance and environmental compatibility.
2Stability of the object's composition
If amodimethicone is used to form macroscopic dispersions, then drop stability and adhesion are improved, but biosourcing and natural origin are worsened
Solution Approach 1:
The invention creates a composite molecular structure combining long-chain alkyl groups (R1, R2, R3 with 20-50 carbon atoms) and amino groups (R4, R5 including NH2) within the polymer backbone. This composite structure mimics the amphiphilic properties of amodimethicone, providing both hydrophobic interactions for stability and cationic charges for adhesion, while being derived from natural biosourced materials.
Solution Approach 2:
The polymer structure is segmented into distinct functional domains: hydrophobic alkyl chains (R1-R3) for stabilizing the dispersed phase, and cationic amino groups (R4-R5) for adhesion to negatively charged surfaces. This segmentation allows the single biosourced polymer to perform multiple functions previously requiring silicone compounds.
3Reliability
If silicone compounds are used in cosmetic compositions, then product performance is improved, but environmental sustainability and health safety are worsened
Solution Approach 1:
The invention converts the potential harm of using persistent silicone compounds into a benefit by designing a biosourced polymer that maintains all performance advantages (kinetic stability, adhesion, dispersion formation) while being inherently safe and biodegradable. The long-chain alkyl structure provides the necessary performance, while the natural origin eliminates health and environmental hazards.
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 dispersion achieves long-term kinetic stability, preventing drop aggregation, adhesion, and coalescence, maintaining the desired properties of silicone-based compositions while being environmentally friendly and biosourced.
Implementation Method 1
The Applicant uses amodimethicone as lipophilic precursor polymer of coacervates to stabilize dispersions
Implementation Method 2
the drops comprise at least one core and at least one shell formed of at least one anionic polymer and at least one cationic polymer
Data Source
AI summary
The present invention concerns a dispersion formed of a dispersed phase in the form of drops and a continuous phase, comprising a fatty phase and an aqueous phase non-miscible with each other at ambient temperature and atmospheric pressure, one of the phases among the fatty phase and the aqueous phase being the dispersed phase and the other phase among the fatty phase and aqueous phase being the continuous phase, wherein the drops comprise at least one core and at least one shell formed of at least one anionic polymer and at least one cationic polymer, the cationic polymer being a compound having the following formula (I):where:n is an integer of 1 to 5;X1 and X2, the same or different, are —O—, —CH2— or —NH—;R1, R2 and R3, the same or different, are each independently a divalent alkylene radical having 20 to 50 carbon atoms;R4 and R5, the same or different, are each independently H, OH or NH2, at least one of the groups R4 and R5 being NH2.