Active Energy Ray-Curable Ink Composition for High-Speed Printing
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Solution Overview
Problem
Current active energy ray-curable inkjet ink compositions fail to achieve excellent curability, adhesiveness to multiple base materials, and non-yellowing properties, particularly for clear ink compositions used in inkjet printing, which are essential for high-quality and versatile printing applications.
Innovation Solution
Incorporating 2-(2-vinyloxyethoxy)ethyl acrylate as a polymerizable monomer and oligo(2-hydroxy-2-methyl-1-(4-(1-methylvinyl)phenyl)propanone) along with a photopolymerization initiator, such as 2,4,6-trimethylbenzoyl diphenylphosphine oxide, to create an ink composition with optimized viscosity and reactivity for improved curability and adhesiveness across various base materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional active energy ray-curable ink compositions are used, then printing speed is improved through immediate curing, but curability and adhesiveness are insufficient on multiple base materials
Solution Approach 1:
The patent uses a composite photopolymerization initiator system comprising both a Type I initiator (cyclic sulfonate ester) and a Type II initiator (hydrogen abstracting type). This combination enables synergistic curing action where Type I initiators provide rapid initial polymerization and Type II initiators ensure complete curing, achieving excellent curability and adhesiveness on diverse base materials while maintaining fast printing speed
Solution Approach 2:
The patent optimizes the concentration ratio of Type I to Type II photopolymerization initiators to achieve balanced curing performance. By carefully controlling the initiator composition parameters, the ink composition achieves both rapid curing for high printing speed and complete polymerization for excellent curability and adhesiveness on multiple base materials
2Manufacturing precision
If clear ink composition is used for high-quality printing, then print quality is improved, but viscosity increases which affects inkjet performance
Solution Approach 1:
The patent employs a specific low-viscosity monomer composition including vinyl monomers and oligomers with controlled molecular weights. This parameter optimization maintains ink composition stability and low viscosity for excellent inkjet ejection performance while achieving high print quality through the optimized photopolymerization system
Solution Approach 2:
The patent uses a combination of monomers and oligomers with different molecular weights and functional groups to achieve local optimization of viscosity characteristics. The specific mixture ratio creates a balanced flow profile that ensures proper inkjet performance while maintaining the clarity and quality required for high-quality printing applications
3Reliability
If polymerizable monomers with high reactivity are used, then curability is improved, but yellowing occurs in the printed matter
Solution Approach 1:
The patent uses a composite photopolymerization initiator system where Type I initiators (cyclic sulfonate esters) and Type II initiators (hydrogen abstracting types) work synergistically. This composite approach achieves complete curing of the polymerizable monomers while the specific initiator chemistry minimizes yellowing, producing clear, high-quality printed matter without discoloration
Solution Approach 2:
The patent employs photopolymerization initiators that decompose completely after initiating polymerization, leaving no residual coloring substances. The cyclic sulfonate ester and hydrogen abstracting type initiators are designed to be consumed in the reaction, ensuring no long-term yellowing effects while achieving complete curability
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 resulting ink composition exhibits superior curability, adhesiveness, and non-yellowing properties, enabling high-quality printing with excellent performance on diverse base materials without increasing viscosity, thus addressing the limitations of existing ink compositions.
Implementation Method 1
an active energy ray-curable ink composition including at least a polymerizable monomer (A) and photopolymerization initiators (B)
Data Source
AI summary
An ink composition which is used for active energy ray-curable inkjet printing, has excellent curability or adhesiveness to multiple base materials while having low viscosity, and exhibits excellent non-yellowing properties of the printed matter is provided. The composition comprises a polymerizable monomer (A) and photopolymerization initiators(B), the polymerizable monomer comprising 2-(2-vinyloxyethoxy)ethyl acrylate(A-1), and the photopolymerization initiators comprising oligo(2-hydroxy-2-methyl-1-(4-(1-methylvinyl)phenyl)propanone) (B-1) and other initiator(B-2).