Electrophoretic Particle Covering Layer Cross-Linking Stability
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Solution Overview
Problem
Electrophoretic particles manufactured using atom transfer radical polymerization (ATRP) exhibit unstable electrification and dispersion properties due to physical and chemical influences during manufacturing and usage, leading to variations in performance.
Innovation Solution
The development of electrophoretic particles with a covering layer comprising polymers linked via cross-linking agents, including epoxy groups for high reactivity and non-ionic or cationic/anionic monomers for charge application, ensures stable electrification and dispersion properties over time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polymer molecules are coupled to base particles using ATRP, then electrophoretic particles can be dispersed and charged in electrophoretic dispersed liquid, but the polymer molecules separate from base particles due to physical collision or chemical influence, causing variations in electrification and dispersion properties
Solution Approach 1:
The patent applies different functional groups at different locations within the polymer molecule. The first functional group (e.g., carboxyl group) is positioned at the coupling part with the base particle to provide strong adhesion, while the second functional group (e.g., amino group) is positioned at the distal end to provide electrification properties. This local differentiation ensures both stable attachment and desired electrical characteristics.
Solution Approach 2:
The patent uses composite polymer molecules containing multiple different functional groups within the same polymer chain. This composite structure combines the adhesion function (first functional group) with the electrification function (second functional group), creating a unified polymer that simultaneously achieves stable coupling and desired electrical properties for electrophoresis.
2Device complexity
If polymer molecules are coupled to base particles at one end only, then the structure is simple, but the coupling part separates due to physical collision or chemical influence during manufacturing and usage
Solution Approach 1:
The patent enhances the local quality at the coupling interface by introducing a first functional group specifically at the portion of the polymer molecule that couples to the base particle. This localized functional group provides enhanced adhesion strength exactly where needed, preventing separation during manufacturing and usage while maintaining overall structural simplicity.
3Adaptability or versatility
If electrophoretic particles are used in electrophoretic dispersed liquid, then display function is achieved, but variations in electrification and dispersion properties occur among particles due to polymer separation
Solution Approach 1:
The patent controls the molecular structure parameters of the polymer, specifically the type and position of functional groups. By designing polymers with a first functional group at the coupling end and a second functional group at the distal end, the patent ensures uniform electrification and dispersion properties across all electrophoretic particles, eliminating variations that would affect display quality.
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 proposed configuration enhances the adhesion strength and mobility of electrophoretic particles, maintaining consistent performance in electrophoretic dispersed liquids and improving the reliability of electrophoretic displays and equipment.
Implementation Method 1
polymerization parts in which monomers are polymerized in living radical polymerization from the polymerization initiation group as a starting point
Implementation Method 2
the polymers are linked to each other at the cross-linking groups of the first polymerization parts via cross-linking agent
Implementation Method 3
microparticles move (migrate) in liquid due to coulomb force if an electric field is made to act on a dispersed system obtained by dispersing the microparticles in liquid. This phenomenon is called electrophoresis
Data Source
AI summary
An electrophoretic particle of the invention include: a mother particle; and a covering layer, wherein the covering layer includes a plurality of polymers, each of which includes a polymerization initiator which includes a polymerization initiation group linked to a surface of the mother particle and polymerization parts in which monomers are polymerized from the polymerization initiation group as a starting point, wherein each of the polymer include the polymerization initiator, a first polymerization part, which is coupled to the polymerization initiator, in which first monomers that includes monomers with cross-linking groups are polymerized, and a second polymerization part in which second monomers that does not include monomers with cross-linking groups are polymerized, and the polymers are linked to each other at the cross-linking groups of the first polymerization parts via cross-linking agent.