Hydrophilic Core Particle with Hydrophobic Polymer Coating for Delayed Release
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Solution Overview
Problem
Current fragranced products for skin, scalp, and hair lose their scent quickly after application, despite efforts to extend fragrance duration through various carriers and microencapsulation systems, leaving a need for a sustained release system that maintains fragrance over extended periods.
Innovation Solution
A delayed release delivery system comprising hydrophilic core particles with surface pores, encapsulated by a polymer with a hydrophobic backbone and hydrophilic pendant groups, which blocks pores in water and unblocks them in its absence, allowing for a slow and sustained release of fragrance as water evaporates, with a liquid-to-particle weight ratio of at least 400:1.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If fragrance is applied directly to skin, scalp or hair, then intense scent is achieved initially, but the scent is lost within minutes
Solution Approach 1:
The fragrance is pre-loaded into porous particles before application. The particles are formulated with specific pore structures and hydrophobic coatings that are designed to control release kinetics. This preliminary preparation ensures the fragrance is trapped in a controlled delivery system rather than applied freely, enabling sustained release over time while maintaining consistent scent levels.
Solution Approach 2:
The invention changes the physical and chemical parameters of the fragrance delivery system by using particles with controlled pore sizes, hydrophobic coatings, and specific surface areas. These parameter changes allow the fragrance to be retained within the particle structure and released gradually through diffusion and evaporation processes, extending duration while maintaining reliability.
2Duration of action of moving object
If microencapsulation systems are used to extend fragrance duration, then release time is extended, but the system complexity increases
Solution Approach 1:
The invention uses porous particles as the fragrance carrier instead of complex microencapsulation systems. The porous structure provides internal volume for fragrance loading and controlled release through the pore network. This approach achieves extended fragrance duration through the inherent properties of porous materials while maintaining relatively simple system architecture and manufacturing processes.
3Duration of action of moving object
If fragrance load is increased to extend duration, then scent longevity improves, but the initial intensity becomes overwhelming
Solution Approach 1:
The fragrance is distributed locally within the porous particle structure rather than applied uniformly to the surface. The hydrophobic coating and pore distribution create localized reservoirs that control the release rate. This local quality approach allows high fragrance loading within particles while maintaining moderate overall scent intensity through controlled release kinetics.
Solution Approach 2:
The porous particle acts as an intermediary between the fragrance and the skin/environment. The particle structure mediates the release process, controlling the rate at which fragrance molecules reach the surface. This intermediary function allows high fragrance content to be delivered at controlled rates, preventing overwhelming initial intensity while ensuring extended duration.
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 system provides a prolonged and continuous release of fragrance, maintaining scent on the skin, scalp, and hair for an extended duration by retaining the liquid within the particles until water evaporates, allowing gradual release through the unblocked pores.
Implementation Method 1
a polymer having a hydrophobic backbone and a plurality of hydrophilic pendant groups. At least some of the surface pores adjacent the hydrophilic pendant groups are blocked in the presence of water
Implementation Method 2
allowing for a slow and sustained release of fragrance as water evaporates
Implementation Method 3
a hydrophilic core particle having surface pores and a liquid contained therein
Data Source
AI summary
A delayed release delivery system comprises a hydrophilic core particle having surface pores and containing a liquid. The particle is encapsulated in a polymer having a hydrophobic backbone and hydrophilic pendant groups. At least some of the surface pores adjacent the hydrophilic pendant groups are blocked in the presence of water and unblocked in the absence of water. The treated particle contains liquid in a weight ratio of the liquid to the porous core particle of at least 400:1.