Radiation-Curable Ink Composition for Adhesion and Curing Speed
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Solution Overview
Problem
Current radiation-curable ink compositions for inkjet recording face challenges in achieving high sensitivity to active radiation, maintaining adhesiveness to recording media, and ensuring image strength and durability, while also dealing with issues like surface tackiness and low storage stability.
Innovation Solution
The ink composition incorporates a polymerizable compound with a specific structure, a different polymerizable compound, and a photoinitiator, with a total content of 70% to 90% by mass, which improves curing sensitivity and adhesion to the recording medium, and includes a photopolymerization initiator to enhance curing properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multi-functional acrylates are used to achieve high curing sensitivity, then curing speed and image strength are improved, but adhesiveness to recording medium deteriorates due to volume shrinkage
Solution Approach 1:
The invention uses a composite monomer system combining acrylate monomers (for high curing sensitivity and speed) with N-vinyl lactam monomers (for adhesion promotion and flexibility). This composite approach allows the acrylate to provide rapid curing while the N-vinyl lactam component compensates for volume shrinkage effects and maintains adhesiveness to the recording medium, resolving the contradiction between curing speed and adhesion.
Solution Approach 2:
The invention changes the chemical composition parameters by introducing N-vinyl lactam monomers with specific functional groups that have different polymerization shrinkage characteristics compared to pure acrylates. This parameter change in monomer composition allows maintaining high curing sensitivity while reducing overall volume shrinkage, thereby preserving adhesiveness.
2Reliability
If N-vinyl caprolactam is used to improve adhesiveness and flexibility, then adhesion to recording medium is enhanced, but surface tackiness and leaching occur due to low co-polymerizable property
Solution Approach 1:
The invention changes the molecular structure parameters of the N-vinyl lactam component by selecting specific chain lengths and functional group configurations that improve co-polymerizability with acrylate monomers. This structural parameter optimization allows the N-vinyl lactam to effectively promote adhesion while being sufficiently incorporated into the polymer network, preventing surface tackiness and leaching of low molecular weight components.
3Reliability
If N-vinyl lactam is used to enhance adhesion, then adhesiveness is improved, but storage stability deteriorates due to increased reactivity and ink viscosity
Solution Approach 1:
The invention optimizes the reactivity parameters of the N-vinyl lactam monomer by selecting specific structural variants with balanced polymerization activity. This parameter optimization ensures sufficient adhesion promotion while maintaining lower reactivity during storage, preventing premature polymerization and viscosity increase, thereby improving storage stability.
4Productivity
If radiation-curable ink composition is formulated for high sensitivity, then curing property is improved, but vaporization of uncured low molecular weight matter occurs
Solution Approach 1:
The invention uses a composite monomer system where N-vinyl lactam monomers with higher molecular weight and different volatility characteristics are combined with acrylate monomers. This composite approach allows achieving high curing sensitivity through the acrylate component while the N-vinyl lactam component has lower vapor pressure, reducing overall vaporization of uncured low molecular weight matter during and after the curing 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
This composition achieves high sensitivity to active radiation, excellent adhesion to the recording medium, and improved image strength and durability, while maintaining stability and preventing surface tackiness and bleeding, thus providing a reliable inkjet recording solution.
Implementation Method 1
an ink composition which cures by irradiation of an active radiation ray
Data Source
AI summary
The present invention provides an ink composition including: (A) a polymerizable compound represented by the following formula (I); (B) a polymerizable compound having a structure that is different from that of the polymerizable component (A); and (C) a photoinitiator, wherein, in the formula (I), R represents a hydrogen atom or a methyl group, X represents a divalent organic group, m represents an integer of 1 or 2, and n represents an integer of 1 to 20.