Metallic Fine Particle Ink Composition for Flexible Conductive Films
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Solution Overview
Problem
Existing metallic fine particle inks suffer from insufficient storage stability and flexural resistance, particularly when used in printed electronics on flexible substrates, leading to conductivity and specular gloss deterioration.
Innovation Solution
A metallic fine particle-containing ink is formulated with specific ratios of a polymer, carboxylic acid, and amine, enhancing dispersion stability and forming a dense metal film with improved flexural resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If metallic fine particles are used in ink for printed electronics on flexible substrates, then conductivity is achieved, but flexural resistance deteriorates leading to cracks in the metal film
Solution Approach 1:
The patent changes the chemical composition parameters of the dispersion medium by introducing a specific system comprising a polymer with organic acid/base groups, carboxylic acid (0.7-15% by mass), and amine (0.7-20% by mass). This parameter change modifies the interaction between the dispersion medium and metallic fine particles, resulting in improved flexural resistance while maintaining conductivity.
Solution Approach 2:
The patent creates a composite dispersion medium system by combining polymer, carboxylic acid, and amine components. This composite approach allows the dispersion medium to simultaneously provide conductivity enhancement and flexural resistance, preventing cracks in the metal film while maintaining electrical properties.
2Device complexity
If conventional dispersion media are used for metallic fine particles, then ink formulation is simple, but storage stability is insufficient
Solution Approach 1:
The patent modifies the compositional parameters of the dispersion medium by incorporating carboxylic acid (0.7-15% by mass) and amine (0.7-20% by mass) in specific ranges. These parameter changes enhance storage stability without excessively complicating the ink formulation process.
Solution Approach 2:
The polymer with organic acid/base groups acts as an intermediary between the carboxylic acid/amine components and the metallic fine particles. This intermediary facilitates stable dispersion while maintaining formulation simplicity, as the polymer mediates the interactions between various components.
3Ease of operation
If metallic fine particle ink is printed using conventional methods, then printing process is straightforward, but open time capability is insufficient
Solution Approach 1:
The patent changes the chemical parameters of the dispersion medium by incorporating the polymer-carboxylic acid-amine system, which modifies the evaporation and drying characteristics of the ink. This extends the open time capability, allowing for adequate handling and positioning time during the printing process while maintaining ease of operation.
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 ink achieves excellent storage stability, flexural resistance, and enhanced open time capability in ink-jet printing, resulting in a printed matter with improved conductivity and specular gloss.
Implementation Method 1
containing metallic fine particles A dispersed with a polymer B, a carboxylic acid C, and an amine D
Implementation Method 2
the polymer B having at least one kind selected from the group consisting of an organic acid group and an organic base group, the carboxylic acid C having 1 or more and 6 or less carbon atoms, the amine D having 1 or more and 6 or less carbon atoms
Implementation Method 3
Metallic fine particles can form a metal film having conductivity by sintering
Implementation Method 4
The ink achieves excellent storage stability, flexural resistance, and enhanced open time capability in ink-jet printing
Data Source
AI summary
The present invention relates to a metallic fine particle-containing ink containing metallic fine particles A dispersed with a polymer B, a carboxylic acid C, and an amine D, the polymer B having at least one kind selected from the group consisting of an organic acid group and an organic base group, the carboxylic acid C having 1 or more and 6 or less carbon atoms, the amine D having 1 or more and 6 or less carbon atoms, and the metallic fine particle-containing ink having a content of the carboxylic acid C of 0.7% by mass or more and 15% by mass or less, and a content of the amine D of 0.7% by mass or more and 20% by mass or less, and a method of producing a printed matter using the ink.