Conductive composition and method of producing same, method of recording conductive image, and conductive image
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Solution Overview
Problem
Existing conductive compositions with metal particles face challenges in achieving stable dispersion and conductivity due to the need for high-temperature firing or washing treatments to remove non-conductive treatment agents, which complicates the recording process and limits the versatility of base materials.
Innovation Solution
A conductive composition featuring metal particles coated with a polypeptide comprising at least 95% by mass of acidic or neutral amino acid units, which provides excellent dispersion stability and conductivity without requiring high-temperature treatments, achieved by using a polypeptide that forms a chemical bond with the metal particles, allowing for simple post-treatment drying to record a conductive image.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a treatment agent is used to disperse metal particles in conductive composition, then dispersion stability is improved, but conductivity deteriorates due to the presence of non-conductive treatment agent requiring high-temperature firing or washing treatment
Solution Approach 1:
The invention changes the chemical composition parameters of the treatment agent by specifying that it must contain carboxylic acid groups with particular pKa values (3.0-6.0). This parameter change allows the treatment agent to provide sufficient dispersion stability through carboxylic acid-metal particle interactions while the controlled acidity prevents excessive non-conductive behavior, enabling conductivity to be maintained without requiring high-temperature firing or washing treatments.
2Reliability
If high-temperature firing treatment is performed to remove treatment agent, then conductivity is improved, but base material versatility deteriorates due to limitation in applicable base materials
Solution Approach 1:
The invention changes the chemical parameters of the treatment agent by controlling the carboxylic acid group content and pKa value range. This allows the treatment agent to be sufficiently removed or decomposed at low temperatures (avoiding high-temperature firing), thereby enabling the conductive composition to be applied to heat-sensitive base materials such as plastics and resins, significantly expanding base material versatility while maintaining adequate conductivity.
3Adaptability or versatility
If simple posttreatment drying is used instead of high-temperature firing, then base material versatility is improved, but conductivity deteriorates due to residual treatment agent
Solution Approach 1:
The invention optimizes the treatment agent parameters by specifying carboxylic acid groups with pKa values of 3.0-6.0 and controlling the amino acid composition (95% or more). These parameter changes enable the treatment agent to be effectively removed or decomposed during simple drying posttreatment, allowing conductivity to be achieved without requiring high-temperature firing, thus resolving the contradiction between base material versatility and conductivity.
4Stability of the object's composition
If conventional treatment agents are used, then dispersion stability is achieved, but manufacturing complexity increases due to required high-temperature firing or washing steps
Solution Approach 1:
The invention changes the chemical parameters of the treatment agent to contain carboxylic acid groups with specific pKa values (3.0-6.0) and high amino acid content (95% or more). This parameter optimization allows the treatment agent to provide adequate dispersion stability while being removable or decomposable at low temperatures, eliminating the need for complex high-temperature firing or washing steps, thereby simplifying the manufacturing process.
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 composition ensures stable dispersion and high conductivity of the metal particles, enabling the recording of conductive images with improved stability and versatility across various base materials using only low-temperature drying, thus overcoming the limitations of previous technologies.
Implementation Method 1
a polypeptide, wherein the polypeptide includes at least one kind of amino acid unit selected from the group consisting of: an acidic amino acid; and a neutral amino acid
Implementation Method 2
a treatment agent that may adsorb to the metal particle needs to be used
Data Source
AI summary
Provided are a conductive composition, which is excellent in dispersion stability of a metal particle, and with which a conductive image excellent in conductivity can be easily recorded by only performing simple posttreatment, and a method of producing the conductive composition. The conductive composition contains a metal particle and a polypeptide, and at least a part of a surface of the metal particle is coated with the polypeptide. The polypeptide includes at least one kind of amino acid unit selected from the group consisting of: an acidic amino acid; and a neutral amino acid, and a ratio (% by mass) of the amino acid unit constituting the polypeptide is 95% by mass or more.