Dual-Cure Microcapsules for Linear Fragrance Release
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Solution Overview
Problem
Existing fabric conditioners fail to provide a consistent and long-lasting fragrance across multiple stages of the laundry process, as free perfume oil is too weak and encapsulated technologies often release perfume at a single specific stage rather than providing a linear release profile.
Innovation Solution
A fabric conditioning composition comprising a mixture of two types of microcapsules with different curing temperatures and times, where one capsule is cured at or above 100°C and the other below, ensuring stability and controlled release of fragrance throughout the laundry process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If free perfume oil is used, then initial fragrance intensity is strong, but fragrance dissipates quickly and is washed away
Solution Approach 1:
The perfume is segmented into multiple encapsulated forms with different release characteristics. The invention uses a combination of encapsulated perfume (in microcapsules) and free perfume, where the encapsulated portion provides sustained release while the free perfume provides initial intensity. This segmentation allows different portions of the perfume to serve different temporal functions.
Solution Approach 2:
The invention changes the physical state and delivery parameters of the perfume by using encapsulation technology. The encapsulated perfume is contained in microcapsules that control release through diffusion or mechanical rupture, fundamentally changing how the perfume is delivered compared to free perfume oil. This parameter change enables controlled release over time.
2Duration of action of stationary object
If encapsulated perfume is used, then fragrance delivery is controlled and sustained, but release occurs at specific stages rather than providing linear release across all stages
Solution Approach 1:
The invention merges multiple encapsulation technologies with different release characteristics into a single composition. Specifically, it combines microencapsulated perfume (providing sustained release) with macroencapsulated perfume (providing friction-based release). This merging creates a synergistic effect where both encapsulation types work together to provide comprehensive coverage across all laundry stages.
Solution Approach 2:
The perfume composition is designed to be universal across multiple laundry stages. The combination of different encapsulation types ensures the perfume functions effectively during washing, drying, ironing, and storage stages. Each encapsulation type contributes to different stages, making the overall composition universally effective throughout the entire laundry process.
3Device complexity
If single-type encapsulation is used, then perfume release mechanism is simple, but release profile is limited to specific stages
Solution Approach 1:
The encapsulation system is segmented into distinct types with different release mechanisms. The invention uses both microencapsulation (for diffusion-based sustained release) and macroencapsulation (for friction-based release). This segmentation allows each type to target specific release needs, collectively providing coverage across all laundry stages while maintaining relatively simple individual mechanisms.
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 composition achieves a linear fragrance release profile across multiple stages, enhancing perfume perception and stability, maintaining fragrance intensity during wear and storage, and providing a consistent scent experience.
Implementation Method 1
the first and second capsules differ in properties due to their polymer walls having been made using the same polymer and different cure temperatures, curing times
Implementation Method 2
diffusive action, wherein perfume is released by diffusion through the outer wall of the encapsulate
Implementation Method 3
shear sensitive action, where the perfume core is released in response to mechanical rupture of the encapsulate
Data Source
AI summary
A fabric conditioning composition comprising: (a) at least 8 wt % of a fabric conditioning active; (b) a first capsule containing an active material, wherein the first capsule comprises a cured polymeric wall and a core; and (c) a second capsule containing an active material wherein the second capsule comprises a cured polymeric wall and a core; wherein the first and second capsules differ in properties due to their polymer walls having been made using the same polymer and different cure temperatures, curing times, or a combination thereof.