Polyurea Microcapsules for Stable Piroctone Scalp Deposition
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Solution Overview
Problem
Existing encapsulation methods for piroctone compounds are unstable, leading to reduced performance and inefficient deposition on the scalp, and there is a need for a stable system to enhance antidandruff efficacy.
Innovation Solution
A core shell microcapsule with a liquid core containing piroctone compound and a polyurea shell formed from aliphatic isocyanates and amines, using a Pickering emulsion-type process, with a deposition aid on the shell for enhanced adherence to the scalp and hair.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If encapsulation methods are used to aid deposition and increase effectiveness of antidandruff agents, then deposition efficiency is improved, but stability of the encapsulated system deteriorates
Solution Approach 1:
The patent changes the chemical parameters of the shell material by specifying polyurea formed from monomeric units of aliphatic isocyanates and amines, and controls the core-to-shell ratio and particle size distribution to achieve both stable encapsulation and effective deposition of piroctone compounds
Solution Approach 2:
The patent uses composite material structure with a liquid core containing piroctone compound and solvent, surrounded by a polyurea shell formed from aliphatic isocyanates and amines, creating a stable encapsulated system that maintains both deposition efficiency and system stability
2Reliability
If encapsulation is used to enhance antidandruff effectiveness, then treatment efficacy is improved, but manufacturing complexity increases
Solution Approach 1:
The patent simplifies the encapsulation structure by defining specific parameter ranges for particle size (0.1-10 μm with Dv0.5 of 0.3-5 μm) and core-to-shell ratio (9:1 to 1:1), enabling effective antidandruff treatment while maintaining manufacturable complexity levels
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 microcapsules provide stable and uniform distribution, allowing for effective deposition and retention of piroctone on the scalp, enhancing antidandruff performance in hair care compositions.
Implementation Method 1
the liquid core comprises solvent and a piroctone compound
Implementation Method 2
the shell comprises polyurea formed from monomeric units of aliphatic isocyanates and amines
Implementation Method 3
with a deposition aid on the shell for enhanced adherence to the scalp and hair
Data Source
AI summary
A core shell microcapsule having a liquid core and an outer shell, in which the liquid core comprises solvent and a piroctone compound and the shell comprises polyurea formed from monomeric units of aliphatic isocyanates and amines.