Polyamide Shell Encapsulation for Perfume Leakage Control
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Solution Overview
Problem
Encapsulated benefit agents, such as perfumes, often experience leakage issues, leading to instability and performance problems in formulations, including loss of intensity and timing in perfume delivery.
Innovation Solution
The development of particles with a polyamide shell containing an aromatic group and a core comprising 70-100% by weight of tertiary alcohols, alpha-substituted aldehydes, aliphatic and aromatic ketones, and ketenes, with less than 15% aliphatic aldehydes, which reduces or prevents leakage and ensures efficient and timely perfume delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If encapsulation is used to deliver benefit agents, then delivery enhancement is achieved, but leakage of the benefit agent occurs over time
Solution Approach 1:
The patent changes the chemical composition parameters of the shell material, specifically using polyamides with controlled aromatic content (5-50 mol% aromatic diamine units) and specific molecular weights (10,000-100,000 g/mol). These parameter changes optimize the balance between shell integrity (preventing leakage) and benefit agent delivery, resolving the contradiction between delivery enhancement and leakage prevention.
Solution Approach 2:
The patent employs composite shell structures combining polyamide polymers with specific aromatic content and optional deposition aids. This composite approach creates a shell that simultaneously provides mechanical integrity to prevent leakage and controlled permeability for benefit agent delivery, thus resolving the contradiction between reliability and productivity.
2Quantity of substance
If encapsulation is used, then perfume intensity is maintained, but timing of perfume delivery is lost
Solution Approach 1:
The patent creates a dynamic release system where the shell gradually responds to environmental conditions (mechanical stress, chemical environment) during the wash cycle. The polyamide shell maintains integrity during storage and washing but progressively releases the benefit agent during the rinse cycle, thus maintaining both perfume intensity and proper timing of delivery.
Solution Approach 2:
The encapsulation system is designed to release the benefit agent in periodic stages corresponding to different wash cycle phases. The shell remains intact during main wash but releases perfume during rinse cycles, creating a periodic action pattern that maintains both intensity and timing of delivery.
3Reliability
If polyamide shell is used, then leakage is reduced, but manufacturing complexity increases
Solution Approach 1:
The patent specifies precise parameter ranges for the polyamide shell (aromatic diamine content of 5-50 mol%, molecular weight 10,000-100,000 g/mol) that optimize both leakage prevention and manufacturability. These parameter constraints guide the manufacturing process, reducing complexity by providing clear targets for shell formulation and production.
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 described particles significantly reduce leakage and enhance the retention and controlled release of benefit agents, maintaining perfume intensity and timing, thereby improving the stability and performance of formulations.
Implementation Method 1
particles comprising a shell and a core, said shell comprising a polyamide polymer that forms a wall that encapsulates said core
Data Source
AI summary
The invention provides a particle comprising: (a) a core comprising a benefit agent; (b) a shell, wherein the shell comprises a polyamide, and wherein the polyamide comprises an aromatic group; and (c) an optional deposition aid; wherein the benefit agent comprises 70-100 wt %, by total weight of the benefit agent, of a component selected from tertiary alcohols, alpha substituted aldehydes, aliphatic and aromatic ketones and ketenes and mixtures thereof, excluding cyclic aliphatic materials containing polar functional groups; and the benefit agent is substantially free from i) aliphatic primary alcohols and ii) aromatic primary alcohols and contains less than 15 wt % of aliphatic aldehydes having a chain length of from 8 to 22, by total weight of the benefit agent.