Non-spherical Microcapsule with Nanoparticle Shell for Surfactant Stability
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Solution Overview
Problem
Existing microcapsules for home and personal care products face challenges in deposition efficiency and stability, particularly when surfactants are present, and it is difficult to produce non-spherical microcapsules effectively.
Innovation Solution
A non-spherical microcapsule composition comprising a core of fatty ester with a melting point of at least 30°C and a shell of nanoparticles with diameters between 10 to 300 nm, which can be formed through liquefying the fatty ester, mixing with a benefit agent, forming an oil-in-water emulsion, and solidifying, while incorporating a deposition aid to enhance deposition efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional spherical microcapsules are used, then manufacturing is easier, but deposition efficiency is poor
Solution Approach 1:
The patent applies asymmetry by intentionally designing non-spherical microcapsules with aspect ratios of 1.1 to 5.0 (preferably 1.3 to 3.0) to improve deposition efficiency. The elongated or flattened shapes enable better alignment and contact with substrates during application, overcoming the limitation of conventional spherical capsules that roll off surfaces. This asymmetric geometry is achieved through controlled emulsion formation and solidification processes.
2Productivity
If surfactants are added to improve deposition, then deposition efficiency improves, but microcapsule stability deteriorates
Solution Approach 1:
The patent changes the physical-chemical parameters of the core material by using fatty esters with melting points of 20°C to 120°C (preferably 30°C to 80°C). This parameter selection allows the core to remain solid at room temperature, providing structural integrity that resists surfactant attack, while still enabling controlled release. The specific melting point range creates an optimal balance between stability and functionality.
Solution Approach 2:
The patent employs composite material structure consisting of a fatty ester core combined with a shell made of natural or synthetic polymers. This composite design provides both the stability needed to resist surfactant degradation and the controlled release properties required for effective deposition. The shell materials are specifically selected to be compatible with surfactants while protecting the core.
3Ease of manufacture
If fatty ester with low melting point is used, then ease of processing improves, but microcapsule stability deteriorates
Solution Approach 1:
The patent optimizes the melting point parameter of the fatty ester core to fall within 20°C to 120°C (preferably 30°C to 80°C). This parameter range ensures the material is soft enough for easy processing and encapsulation at elevated temperatures, yet solidifies to provide structural stability at room temperature. The melting point is carefully selected to balance processing ease with final product stability.
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 microcapsules achieve stable non-spherical shapes even in the presence of surfactants and improve deposition efficiency, as demonstrated by their ability to maintain shape and release benefit agents effectively in various care compositions.
Implementation Method 1
liquefying the fatty ester
Implementation Method 2
forming an oil-in-water non-spherical emulsion by the nanoparticles
Implementation Method 3
solidifying the fatty ester
Data Source
AI summary
Disclosed is a non-spherical microcapsule comprising a core comprising fatty ester having a melting point of at least 30° C. and a benefit agent; a shell comprising nanoparticles having a diameter of 10 to 300 nm.