Silver Ink Composition for Low Viscosity Inkjet Printing
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Solution Overview
Problem
The preparation of silver ink compositions for ink jet printing is complicated due to the need for reducing silver nitrate with a reducing agent, making the process cumbersome.
Innovation Solution
A silver ink composition comprising silver carboxylate, aliphatic primary or secondary amine, and acetylene alcohol, with specific components and ratios, that can be blended to achieve a low viscosity and surface tension, allowing for easy application and formation of metal silver through a simple method.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If silver nanoparticles are dispersed in organic solvents to form silver ink composition, then the composition can be applied to ink jet printing, but the preparation process becomes complicated requiring reduction of silver nitrate with reducing agents
Solution Approach 1:
The invention changes the chemical parameters of the silver source from silver nitrate to silver carboxylate, and modifies the solvent system by introducing specific carboxylic acid components. This parameter change eliminates the need for complex reduction processes while maintaining the ink jet printing applicability and metal silver formation capability.
Solution Approach 2:
The invention extracts and removes the complicated reduction process step from the preparation methodology. By using silver carboxylate as the silver source, the multi-step reduction process is eliminated, allowing direct formation of metal silver through simpler heating treatment after printing.
2Productivity
If conventional silver ink composition is used, then metal silver can be formed, but the process requires multiple steps including reduction and heating
Solution Approach 1:
The invention performs preliminary action by pre-forming the silver carboxylate complex with the carboxylic acid component before printing. This preliminary preparation eliminates the need for time-consuming reduction steps during or after printing, as the silver is already in a form that converts directly to metal silver through simple heating.
Solution Approach 2:
The invention ensures continuity of useful action by designing a process where the silver carboxylate directly converts to metal silver through heating without interruption for separate reduction steps. This continuous conversion pathway improves productivity and eliminates time losses associated with multiple discrete process steps.
3Reliability
If silver ink composition is prepared by reduction of silver nitrate, then metal silver can be formed, but the process is cumbersome and less suitable for practical applications
Solution Approach 1:
The invention changes the operational parameters by replacing the reduction-based methodology with a direct heating-based approach. The silver carboxylate formulation allows the process to be operated simply through heating after printing, eliminating complex reduction operations while maintaining reliable metal silver formation.
Solution Approach 2:
The silver carboxylate compound performs self-service by automatically converting to metal silver through heating without requiring external reducing agents or complex process controls. This self-converting property simplifies operation while ensuring reliable metal silver formation at practical amounts.
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 silver ink composition can be prepared simply and is suitable for ink jet printing, enabling the formation of a practical amount of metal silver with improved conductivity and reduced impurities, facilitating better metal-to-metal contact and reduced resistivity.
Implementation Method 1
a silver carboxylate having a group represented by a formula '-COOAg'
Implementation Method 2
the ink composition has a viscosity at 27° C. of 40 mPa·s or less
Implementation Method 3
an aliphatic primary amine or secondary amine having 2 to 10 carbon atoms, an acetylene alcohol represented by a general formula (2)
Data Source
AI summary
A silver ink composition Which includes a silver carboxylate having a group represented by a formula iCOOAg, an aliphatic primary amine or secondary amine having 2 to 10 carbon atoms, an acetylene alcohol represented by a general formula (2) shown below, and a hydrocarbon having 6 to 20 carbon atoms, and has a viscosity at 27° C. of 40 mPa-s or less,in the formula, each of R′ and R″ independently represents an alkyl group having 1 to 20 carbon atoms or a phenyl group in which one or more hydrogen atoms may be substituted with a substituent.