Ink Composition for Inkjet Recording with Cyclic Amine and Alicyclic Monomers
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Solution Overview
Problem
Current inkjet-recording technologies face challenges in achieving high sensitivity curing with flexibility and adhesiveness to recording media, as existing radiation-curable ink compositions often suffer from poor adhesion and flexibility due to volume shrinkage during curing, and the use of amine compounds can compromise curing sensitivity or cause surface stickiness.
Innovation Solution
An ink composition comprising a compound with a polymerizable unsaturated bond and a cyclic amine structure, combined with a compound having a polymerizable unsaturated bond and an alicyclic structure, along with a radical polymerization initiator, which is ejected onto a recording medium and cured using actinic radiation, enhancing curing sensitivity, adhesiveness, and flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If polyfunctional acrylate is used to improve curing sensitivity, then curing speed is improved, but adhesiveness to recording medium deteriorates due to volume shrinkage
Solution Approach 1:
The invention uses a composite monomer system comprising polyfunctional acrylate (for high curing sensitivity), monofunctional acrylate (for flexibility and reduced shrinkage), and cyclic carboxylate (for adhesion promotion). This composite approach balances the competing requirements of curing speed and adhesiveness by combining the advantages of different monomer types.
Solution Approach 2:
The invention optimizes the compositional parameters by controlling the ratios of polyfunctional acrylate (5-50 mass%), monofunctional acrylate (30-70 mass%), and cyclic carboxylate (10-30 mass%). By adjusting these parameters, the formulation achieves both high curing sensitivity and sufficient adhesiveness while maintaining flexibility.
2Reliability
If amine compounds are added to improve resistance to climatic conditions, then durability is improved, but curing sensitivity deteriorates due to radical trapping
Solution Approach 1:
The invention extracts or removes the problematic amine compounds from the ink composition. Instead of using amine-based durability improvers that trap radicals and reduce curing sensitivity, the patent achieves climate resistance through alternative mechanisms using the specified monomer combination, particularly the cyclic carboxylate component.
Solution Approach 2:
The invention introduces cyclic carboxylate as an intermediary substance that provides climate resistance without the harmful radical-trapping effect of amine compounds. This mediator substance achieves durability improvement while maintaining high curing sensitivity.
3Productivity
If large amount of polyfunctional monomers are used to compensate for decreased sensitivity, then curing sensitivity is improved, but flexibility in cured film deteriorates
Solution Approach 1:
The invention optimizes the functional group distribution by limiting polyfunctional acrylate to 5-50 mass% and adding monofunctional acrylate (30-70 mass%) to provide flexibility. This parameter optimization ensures high curing sensitivity while maintaining cured film flexibility through balanced crosslinking density.
Solution Approach 2:
The invention creates local quality differences in the cured film by using monofunctional acrylate components that provide flexible segments between crosslink points. This results in a cured film with both high sensitivity (from polyfunctional acrylate crosslinks) and good flexibility (from monofunctional acrylate segments).
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 proposed ink composition achieves high sensitivity curing with improved adhesiveness and flexibility, reducing surface stickiness and maintaining image strength, while also reducing electricity consumption and extending the lifespan of radiation generators.
Implementation Method 1
An ink composition comprising a compound with a polymerizable unsaturated bond and a cyclic amine structure, combined with a compound having a polymerizable unsaturated bond and an alicyclic structure, along with a radical polymerization initiator, which is ejected onto a recording medium and cured using actinic radiation
Data Source
AI summary
An ink composition for inkjet-recording, which shows a high sensitivity to irradiation with actinic radiation and is able to form an image with superior curability, permitting the image formed after curing to have sufficient adhesiveness to a recording medium, as well as to have excellent flexibility in the formed image portion, and an inkjet-recording method using the same is provided: wherein the ink composition for inkjet-recording comprises (A) a compound having a polymerizable unsaturated bond and a cyclic amine structure in the molecule, (B) a compound having a polymerizable unsaturated bond and an alicyclic structure in the molecule, and (C) a radical polymerization initiator.