Actinic Radiation-Curable Inkjet Ink Gloss and Migration Control
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Solution Overview
Problem
Actinic radiation-curable inkjet inks often struggle to achieve high glossiness while suppressing migration and yellowing, particularly when using fluorescent brighteners, which can lead to reduced image quality and color tone issues.
Innovation Solution
An actinic radiation-curable inkjet ink formulation incorporating a photocurable compound with (meth)acrylate having two or more (meth)acryloyl groups, a benzoxazole-based fluorescent brightener, and a polyfunctional phenol-based antioxidant, which enhances glossiness by forming a smooth surface layer and reduces migration through π-π interaction and increased crosslink density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fluorescent brightener is added to improve curability and suppress yellowing, then the curability is enhanced and yellowing is suppressed, but the glossiness of the image is difficult to increase and migration occurs
Solution Approach 1:
The patent changes the molecular structure parameters of the fluorescent brightener by specifying particular substituent patterns (R1-R8 groups) and linking groups (A) in the chemical formula. This structural parameter optimization allows the fluorescent brightener to simultaneously improve curability while preventing migration and maintaining glossiness, resolving the contradiction between enhanced curability and image quality degradation.
Solution Approach 2:
The patent creates a composite ink formulation by combining the specifically structured fluorescent brightener with a polyfunctional phenol-based antioxidant (formula 6) and photocurable compounds. This composite approach synergistically addresses multiple issues: the fluorescent brightener enhances curability and suppresses yellowing, while the antioxidant component prevents migration and maintains glossiness, thus resolving the contradiction between improved curability and maintained image quality.
2Reliability
If a fluorescent brightener is added to improve curability and suppress yellowing, then the curability is enhanced and yellowing is suppressed, but migration of the brightener occurs
Solution Approach 1:
The patent introduces a polyfunctional phenol-based antioxidant (formula 6) as an intermediary substance that mediates between the fluorescent brightener and the cured film matrix. This antioxidant acts as a stabilizing agent that prevents the fluorescent brightener from migrating within the cured film, while allowing the fluorescent brightener to maintain its function of enhancing curability and suppressing yellowing. The intermediary antioxidant thus resolves the contradiction between improved curability and prevented migration.
Solution Approach 2:
The patent creates a composite formulation where the polyfunctional phenol-based antioxidant and specifically structured fluorescent brightener work synergistically. The antioxidant component stabilizes the fluorescent brightener in place, preventing migration, while the fluorescent brightener enhances curability and suppresses yellowing. This composite material approach resolves the contradiction between enhanced curability and maintained compositional stability.
3Ease of operation
If conventional ink formulations are used, then the basic printing function is achieved, but the glossiness is insufficient and migration occurs
Solution Approach 1:
The patent optimizes the molecular structure parameters of the fluorescent brightener by specifying particular substituent patterns (R1-R8) and linking groups (A) in the chemical formula. This structural parameter optimization enhances the fluorescent brightener's ability to improve glossiness while preventing migration, thus resolving the contradiction between basic printing function and enhanced surface quality.
Solution Approach 2:
The patent creates a composite ink formulation by combining the specifically structured fluorescent brightener with a polyfunctional phenol-based antioxidant (formula 6). This composite approach synergistically addresses multiple issues: the fluorescent brightener enhances glossiness and suppresses yellowing, while the antioxidant component prevents migration and maintains the basic printing function, thus resolving the contradiction between basic functionality and enhanced surface quality.
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 inkjet ink achieves higher glossiness and suppressed migration, maintaining color tone and improving image quality by forming a dense network structure that prevents fluorescent brightener migration and yellowing.
Implementation Method 1
a droplet of an inkjet ink containing a photocurable compound to be cured through irradiation with actinic radiation
Implementation Method 2
the fluorescent brightener increases the curability of the ink, and in particular, hue is improved (namely, yellowing is suppressed) by using the fluorescent brightener
Data Source
AI summary
An actinic radiation-curable inkjet ink containing a photocurable compound, a photopolymerization initiator, a fluorescent brightener, and a phenol-based antioxidant, in which the fluorescent brightener is a compound represented by general formula (1), and the photocurable compound contains a (meth)acrylate having two or more (meth)acryloyl groups in an amount of 80mass% or more with respect to a total mass of the photocurable compound.