Microencapsulated Metal Particles for Inkjet Wiring Stability
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Solution Overview
Problem
Metal particles used in ink-jet metal wiring tend to aggregate due to high surface activity, leading to reduced adhesion to substrates and instability in dispersion, especially when coated with low molecular weight compounds that can elute ions causing further aggregation.
Innovation Solution
A microencapsulated particulate metal material is developed with metal particles coated by a polymer containing ionic groups, specifically using cationically and anionically polymerizable surfactants to form a polymer layer that controls ion elution and aggregation, enhancing storage stability and adhesion to substrates through emulsion polymerization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If metal particles are coated with low molecular weight compounds such as thiol, then dispersion stability is improved, but ion elution occurs causing aggregation
Solution Approach 1:
The patent uses a polymer coating as an intermediary layer between the metal particles and the environment. This polymer layer contains ionic groups that interact with the metal particles through coordination bonds, preventing direct contact between metal ions and solvent while maintaining dispersion stability. The polymer acts as a mediator that stabilizes the system without causing ion elution.
Solution Approach 2:
The invention creates a composite structure consisting of metal particles core coated with a polymer shell containing ionic groups. This composite material combines the beneficial properties of metal particles (conductivity, catalytic activity) with the stabilizing properties of the polymer coating, preventing aggregation while maintaining dispersion stability.
2Strength
If metal particles are used for ink jet metal wiring, then adhesion to substrate is required, but aggregation reduces adhesion
Solution Approach 1:
The polymer coating with ionic groups serves as an intermediary that enhances adhesion between metal particles and substrate. The ionic groups in the polymer can interact with both the metal particles and the substrate surface, creating strong adhesion. This intermediary layer prevents direct aggregation of metal particles while maintaining strong bonding to the substrate.
Solution Approach 2:
The patent changes the chemical parameters of the coating by using polymers with specific ionic groups instead of low molecular weight compounds. This parameter change (from low molecular weight to polymer, from neutral to ionic) fundamentally alters the interaction mechanisms, preventing aggregation while enhancing adhesion through ionic interactions with the substrate.
3Stability of the object's composition
If polymer coating with ionic groups is used, then ion elution is controlled and aggregation is suppressed, but manufacturing complexity increases
Solution Approach 1:
The patent employs preliminary action by pre-synthesizing polymers with specific ionic groups before the coating process. These pre-prepared polymer coatings are then applied to metal particles in a straightforward coating step. This preliminary preparation of the polymer material simplifies the overall manufacturing process compared to synthesizing complex coating structures in situ.
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 solution effectively suppresses metal particle aggregation, improves long-term storage stability, and enhances adhesion to substrates, maintaining dispersion stability and ejection stability in ink-jet metal wiring applications.
Implementation Method 1
a polymer coating the metal particles, and an ionic group provided on a surface of the polymer
Implementation Method 2
the polymer including a repeating structural unit derived from a cationically polymerizable surfactant having a cationic group, a hydrophobic group and a polymerizable group
Data Source
AI summary
A microencapsulated particulate metal material includes metal particles, a polymer coating the metal particles, and an ionic group provided on a surface of the polymer.