Oil-Based Inkjet Ink Composition for Polypropylene Deformation Control
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Solution Overview
Problem
Oil-based inkjet inks cause deformation of clear files made from polypropylene due to ink components penetrating and swelling the material, and existing ester-based solvents with high carbon numbers face challenges in discharge performance and volatility.
Innovation Solution
An oil-based inkjet ink formulation using a fatty acid ester-based solvent with 12 to 23 carbon atoms, where at least one alkyl group has a side chain of at least 4 carbon atoms, providing steric hindrance and preventing penetration into clear files, while maintaining suitable viscosity for discharge performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If conventional ester-based solvents with high carbon numbers (24-36) are used to prevent clear file deformation, then clear file stability is improved, but discharge performance and volatility control deteriorate
Solution Approach 1:
The patent changes the carbon number parameter of the ester-based solvent from the conventional range of 24-36 to a new range of 12-23, while also modifying the molecular structure by introducing branched alkyl groups with side chains of at least 4 carbon atoms. This parameter change achieves a balance between preventing clear file deformation and maintaining satisfactory discharge performance
Solution Approach 2:
The patent introduces specific local structural features into the solvent molecules by requiring at least one of R1 or R2 to be a branched alkyl group with a side chain of at least 4 carbon atoms. This local structural modification provides steric hindrance that prevents penetration into clear files while maintaining overall molecular properties for good discharge performance
2Productivity
If solvents with low viscosity are used to improve discharge performance, then discharge performance is improved, but volatility increases causing clear file deformation
Solution Approach 1:
The patent creates a composite solvent system by combining a fatty acid ester-based solvent (formula 1) with specific carbon number and branched structure with other components including a polyol ester-based solvent and a hydrocarbon solvent. This composite formulation achieves both low viscosity for good discharge performance and appropriate volatility control to prevent clear file deformation
Solution Approach 2:
The fatty acid ester-based solvent acts as an intermediary substance that mediates between the conflicting requirements of low viscosity and controlled volatility. Its specific molecular structure with branched alkyl groups provides steric hindrance that limits its ability to penetrate and swell clear files, while its physical properties enable satisfactory discharge performance
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 effectively prevents clear file deformation and improves discharge performance by reducing volatility and maintaining stable viscosity, ensuring reliable printing and storage stability.
Implementation Method 1
at least one of the alkyl groups of R1 and R2 is a branched alkyl group having a side chain of at least 4 carbon atoms
Data Source
AI summary
An ink is provided which can prevent the deformation and degradation of resin products by printed items, and is also suitable for inkjet printing. The oil-based inkjet ink contains a colorant and a fatty acid ester-based solvent represented by general formula (1) shown below and having 12 to 23 carbon atoms in one molecule.(In general formula (1), each of R1 and R2 independently represents an alkyl group, and at least one of the alkyl groups of R1 and R2 is a branched alkyl group having a side chain of at least 4 carbon atoms.).