Oil-based inkjet ink
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Solution Overview
Problem
Ester-based solvents with high carbon numbers in inkjet inks lead to slow penetration and increased viscosity, causing roller transfer contamination and degradation of resin tubes, while those with low carbon numbers result in clear file deformation and odor issues.
Innovation Solution
An oil-based inkjet ink containing a fatty acid ester-based solvent with 18-29 carbon atoms, featuring at least one branched alkyl group with a side chain of 4 or more carbon atoms, which prevents resin tube degradation and roller transfer contamination by maintaining low viscosity and rapid penetration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ester-based solvents with high carbon numbers (≥24) are used in inkjet ink, then the ink shows good discharge stability and does not swell transparent files, but the viscosity increases and penetration speed into recording medium becomes slow, causing roller transfer contamination
Solution Approach 1:
The patent changes the molecular structure parameters of the ester-based solvent by introducing specific side chains with 4 or more carbon atoms at positions 3, 7, or 11 of the fatty acid portion. This structural modification allows the solvent to maintain low viscosity and fast penetration speed while preserving discharge stability and preventing file swelling, thus resolving the contradiction between reliability and speed.
Solution Approach 2:
The patent applies local quality by specifically positioning side chains with 4 or more carbon atoms at particular locations (positions 3, 7, or 11) within the fatty acid structure. This localized structural feature enables the solvent to achieve both fast penetration and discharge stability simultaneously, rather than requiring uniform structural changes throughout the entire molecule.
2Reliability
If ester-based solvents with high carbon numbers are used, then discharge stability is improved, but resin tubes undergo degradation due to slow penetration and prolonged contact time
Solution Approach 1:
The patent modifies the molecular structure parameters of the ester-based solvent by introducing side chains with 4 or more carbon atoms at specific positions (3, 7, or 11) of the fatty acid portion. This structural change reduces viscosity and increases penetration speed, allowing the solvent to quickly penetrate the recording medium and reduce contact time with resin tubes, thereby preventing degradation while maintaining discharge stability.
Solution Approach 2:
The patent enables the solvent to 'rush through' the system by significantly improving penetration speed into the recording medium. The modified ester-based solvent penetrates rapidly, reducing the time it spends in contact with resin tubes and minimizing degradation, while still maintaining the discharge stability provided by high carbon number esters.
3Speed
If ester-based solvents with low carbon numbers are used, then penetration speed is improved, but clear files undergo deformation and odor issues occur
Solution Approach 1:
The patent changes the molecular structure parameters by maintaining a high total carbon number (≥24) in the ester-based solvent while introducing specific side chain structures. This ensures the solvent has sufficient molecular weight to prevent clear file deformation and odor issues, while the side chain configuration optimizes penetration speed.
Solution Approach 2:
The patent creates a composite molecular structure by combining a fatty acid backbone with specific side chains containing 4 or more carbon atoms at positions 3, 7, or 11. This composite structure integrates the benefits of both high carbon number esters (file stability, low odor) and enhanced penetration speed, achieving a balance that neither component alone could provide.
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 prevents resin tube degradation and roller transfer contamination while ensuring rapid ink penetration and reducing odors, enhancing image density and print quality.
Implementation Method 1
the non-aqueous solvent penetrates rapidly into the interior of the recording medium, allowing the printed item to dry
Implementation Method 2
an inkjet ink of high fluidity is jetted from fine nozzles in the form of liquid droplets, thereby recording an image
Data Source
AI summary
Provided is an oil-based inkjet ink containing a pigment and a fatty acid ester-based solvent represented by general formula (1) shown below and having at least 18 but not more than 29 carbon atoms per molecule. In general formula (1), R1 represents an alkyl group of 5 or more carbon atoms, R2 represents an alkyl group of 6 or more carbon atoms, and at least one of R1 and R2 is a branched alkyl group of 9 or more carbon atoms having a side chain of 4 or more carbon atoms.