Inkjet Curable Composition Viscosity Stability
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Solution Overview
Problem
The curable composition for inkjet described in existing patents has low storage stability and a short pot life, especially when exposed to temperatures above 50°C, leading to increased viscosity and difficulty in ejection during inkjet printing.
Innovation Solution
A curable composition for inkjet that includes a polyfunctional compound with at least two (meth)acryloyl groups, a compound with a cyclic ether group, a heat-curing agent, and a color material, with specific weight ratios and properties to ensure improved storage stability and extended pot life, allowing for stable ejection and curing at temperatures up to 100°C.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the curable composition contains a monomer having a (meth)acryloyl group and a heat-curable functional group to enable inkjet application, then the ejection properties are improved, but the pot life under 50°C or higher temperature becomes short due to premature curing
Solution Approach 1:
The patent changes the chemical parameters of the composition by replacing traditional monomers with cyclic ether compounds that have suppressed reactivity at inkjet device temperatures. This parameter change allows the composition to maintain stability (long pot life) while still achieving proper ejection properties through controlled viscosity modification using specific cyclic ether structures.
Solution Approach 2:
The patent employs a composition design where the cyclic ether compound acts as a temporary, consumable component that provides viscosity control and ejection properties during the inkjet process, but does not undergo premature curing. This allows the composition to be 'used up' in its functional form during ejection without compromising stability.
2Ease of operation
If the viscosity of the curable composition is reduced to improve ejection properties in inkjet mode, then the ejection is improved, but gelation proceeds during storage reducing storage stability
Solution Approach 1:
The patent modifies the chemical composition parameters by introducing cyclic ether compounds with specific molecular structures that provide viscosity reduction without triggering gelation. The specific parameter changes in composition enable the material to maintain low viscosity for ejection while resisting premature crosslinking during storage.
Solution Approach 2:
The cyclic ether compound acts as an intermediary substance that mediates between the conflicting requirements of low viscosity for ejection and stability against gelation during storage. It provides the necessary fluidity for inkjet application while its specific chemical structure prevents premature polymerization.
3Ease of operation
If the inkjet device is warmed to 50°C or higher to improve ejection properties, then the viscosity decreases and ejection is improved, but the curing of the composition proceeds increasing viscosity and making ejection difficult
Solution Approach 1:
The patent changes the thermal reactivity parameters of the composition by using cyclic ether compounds that have high thermal stability and suppressed reactivity at 50-100°C. This parameter change allows the composition to benefit from temperature-induced viscosity reduction for ejection while resisting thermally-induced curing that would increase viscosity.
Solution Approach 2:
The composition is designed with cyclic ether compounds that preemptively counteract the harmful effect of thermal curing before it can occur. The specific chemical structure of the cyclic ether provides preliminary protection against premature crosslinking at inkjet device operating temperatures, maintaining viscosity stability throughout the ejection 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 maintains low viscosity and stability at elevated temperatures, enabling efficient inkjet ejection and forming high-quality, heat-resistant resist patterns with extended pot life and improved storage stability.
Implementation Method 1
a curable composition for inkjet which can be cured by the irradiation with light and the application of heat
Implementation Method 2
a heat-curing agent and a color material, wherein the amount of the polyfunctional compound is 20% by weight or more and 95% by weight or less
Data Source
AI summary
Provided is a curable composition for inkjet, which can have improved storage stability. The curable composition for inkjet according to the present invention can be applied in an inkjet mode, and can be cured by the irradiation with light and the application of heat, the curable composition for inkjet according to the present invention comprises a polyfunctional compound having at least two (meth) acryloyl groups, a compound having a cyclic ether group, a heat-curing agent and a color material which cannot be dissolved in the polyfunctional compound and which is dissolved in the curable composition.