Inkjet Ink Composition Monofunctional Acrylate Curing Speed Adhesion
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Solution Overview
Problem
Current inkjet recording methods face challenges in achieving high sensitivity, flexibility, and adhesiveness to recording media while maintaining low production costs and reducing waste, particularly with radiation-curable ink compositions that suffer from reduced flexibility and adhesion due to the use of multifunctional acrylates and N-vinyl lactams.
Innovation Solution
An inkjet recording ink composition comprising a combination of monofunctional and multifunctional polymerizable monomers, specifically including a polymerizable compound with an acryloyl group and an amino group, with a radical polymerization initiator, where the monofunctional monomer constitutes 90-99.9% and the multifunctional monomer 0.1-10% of the total polymerizable compounds, enhancing curing speed and adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a multifunctional acrylate is used as the main component of the curable composition to achieve high curing speed, then the curing speed is improved, but the flexibility after curing and adhesiveness to the recording medium are reduced due to volume shrinkage
Solution Approach 1:
The patent changes the chemical composition parameters by using a specific multifunctional acrylate (divinyl benzene crosslinked structure) combined with a monofunctional acrylate and N-vinyl lactam in controlled ratios, where the multifunctional acrylate content is limited to 5-50 mass% to balance curing speed with flexibility and adhesion
Solution Approach 2:
The patent creates a composite curable composition system combining three types of monomers (monofunctional acrylate, multifunctional acrylate with divinyl benzene crosslinked structure, and N-vinyl lactam) where each component contributes different properties: the monofunctional acrylate provides flexibility, the multifunctional acrylate provides curing speed and crosslinking, and the N-vinyl lactam enhances adhesion while reducing tackiness
2Strength
If N-vinyl caprolactam is used to promote adhesiveness and flexibility after curing, then the adhesiveness is improved, but the copolymerizability with general-purpose radical-polymerizable monomer is poor and storage stability deteriorates
Solution Approach 1:
The patent optimizes the content ratio of N-vinyl lactam to 5-50 mass% in combination with specific monofunctional and multifunctional acrylates, which improves copolymerizability and maintains storage stability while achieving the desired adhesiveness and flexibility
Solution Approach 2:
The patent forms a composite monomer system where N-vinyl lactam is combined with monofunctional and multifunctional acrylates in specific ratios, creating synergistic effects that improve copolymerizability, enhance adhesion, and maintain storage stability that cannot be achieved by N-vinyl lactam alone
3Strength
If the content ratio of monofunctional polymerizable monomer is increased to 90-99.9% to improve flexibility after curing, then the flexibility is improved, but the curing sensitivity may be reduced
Solution Approach 1:
The patent precisely controls the content ratio of monofunctional polymerizable monomer to 90-99.9% while incorporating 0.1-10% polyfunctional polymerizable monomer and optimizing the overall composition to achieve both high flexibility and adequate curing sensitivity
Solution Approach 2:
The patent creates a composite monomer system combining monofunctional and polyfunctional polymerizable monomers with a radical polymerization initiator, where the polyfunctional monomer provides crosslinking for curing sensitivity while the monofunctional monomer dominates to ensure flexibility
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 achieves high sensitivity to actinic radiation, forming a cured film with excellent curability, flexibility, and adhesiveness to the recording medium, while maintaining jetting stability and reducing waste, thereby improving image quality and durability.
Implementation Method 1
An inkjet recording ink composition, comprising (A) polymerizable compounds comprising a monofunctional polymerizable monomer and a polyfunctional polymerizable monomer, and (B) a radical polymerization initiator
Data Source
AI summary
An inkjet recording ink composition, including polymerizable compounds including a monofunctional polymerizable monomer and a polyfunctional polymerizable monomer, and a radical polymerization initiator, wherein the polymerizable compounds include a polymerizable compound having, in a molecule thereof, a polymerizable unsaturated bond and an amino group, and a content ratio of the monofunctional polymerizable monomer with respect to the total amount of the polymerizable compounds is from 90% by mass to 99.9% by mass, and a content ratio of the polyfunctional polymerizable monomer with respect to the total amount of the polymerizable compounds is from 0.1 % by mass to 10% by mass.