Chitosan-Shell Delivery Particles for Fabric Deposition
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Solution Overview
Problem
Existing fabric care compositions face challenges in achieving improved deposition of benefit agents on fabrics using naturally occurring, biodegradable delivery particles that do not require additional processing or coating steps, while maintaining cost-effectiveness and enhancing performance, such as perfume intensity.
Innovation Solution
A fabric care composition incorporating triester quaternary ammonium ester material derived from C13-C22 fatty acids and delivery particles with a core-shell structure, where the shell is the reaction product of polyisocyanate and chitosan, preferably hydrolyzed chitosan, providing improved deposition and biodegradability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cationic surface coatings are added to delivery particles to improve deposition on negatively charged fabrics, then deposition performance is improved, but manufacturing complexity and cost increase due to additional processing steps
Solution Approach 1:
The invention changes the surface charge parameter of delivery particles from neutral or anionic to naturally cationic by using chitosan-based materials. Chitosan contains protonated amino groups that provide positive charge at acidic to neutral pH, enabling electrostatic attraction to negatively charged fabric surfaces without requiring additional coating processing steps.
Solution Approach 2:
The invention uses composite materials where the delivery particle shell is formed from chitosan, a natural polysaccharide with inherent cationic properties. This composite approach combines the beneficial deposition characteristics of cationic materials with the biodegradability and natural origin of chitosan, eliminating the need for separate coating operations.
2Reliability
If cationic surface coatings are applied to delivery particles to enhance deposition, then deposition performance is improved, but manufacturing cost increases due to additional processing
Solution Approach 1:
The chitosan-based delivery particles provide self-service by inherently possessing cationic surface charge through their chemical structure. The protonated amino groups in chitosan automatically provide the positive charge needed for fabric deposition, eliminating the need for separate coating operations and associated costs.
Solution Approach 2:
The invention changes the surface charge parameter of delivery particles from neutral or anionic to naturally cationic by using chitosan-based materials. Chitosan contains protonated amino groups that provide positive charge at acidic to neutral pH, enabling electrostatic attraction to negatively charged fabric surfaces without requiring additional coating processing steps.
3Ease of manufacture
If conventional delivery particles are used without natural materials, then manufacturing simplicity is maintained, but environmental biodegradability is reduced
Solution Approach 1:
The invention uses composite materials where the delivery particle shell is formed from chitosan, a natural polysaccharide with inherent cationic properties. This composite approach combines the beneficial deposition characteristics of cationic materials with the biodegradability and natural origin of chitosan, eliminating the need for separate coating operations.
Solution Approach 2:
The invention changes the material composition parameter from synthetic to natural by using chitosan, a biodegradable polysaccharide derived from chitin. This material maintains manufacturing simplicity while providing inherent cationic charge and environmental biodegradability, resolving the contradiction between ease of manufacture and environmental impact.
4Reliability
If deposition aids are added to the formulation to improve delivery particle deposition, then deposition performance is improved, but formulation complexity and cost increase
Solution Approach 1:
The chitosan-based delivery particles provide self-service by inherently possessing cationic surface charge through their chemical structure. The protonated amino groups in chitosan automatically provide the positive charge needed for fabric deposition, eliminating the need for separate coating operations and associated costs.
Solution Approach 2:
The invention merges the functions of the delivery particle shell and the cationic deposition promoter into a single integrated component. The chitosan shell itself provides the cationic charge normally supplied by separate deposition aids, thereby simplifying the formulation by eliminating or reducing the need for additional deposition aid chemicals.
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 triester quats and chitosan/isocyanate delivery particles enhances wet touchpoint performance and reduces complexity and cost by offering effective deposition and biodegradability, while maintaining fragrance intensity.
Implementation Method 1
the shell comprises a polymeric material that is the reaction product of a polyisocyanate and chitosan
Implementation Method 2
cationically charged particles may also be advantageous, as they tend to show improved deposition on negatively charged surfaces
Data Source
AI summary
A fabric care composition that includes quaternary ammonium ester material and a population of delivery particles, where the quaternary ammonium ester material includes triester quaternary ammonium material (“triester quats”), and where the shells of the delivery particles include a polymeric material that is the reaction product of a polyisocyanate and chitosan, preferably hydrolyzed chitosan. A method of treating a fabric with the composition.