Photocurable Ink Composition with Amine Pair for High-Gloss Cured Films
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Solution Overview
Problem
Existing photocurable ink compositions do not adequately address the issue of improving the glossiness of cured films.
Innovation Solution
A photocurable ink composition containing amine compounds with α-hydrogen atoms, including amine A with a hindered amine structure and amine B without a hindered amine structure, along with a sensitizer, to suppress radical polymerization inhibition by oxygen and enhance curability across the film thickness, thereby improving glossiness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If conventional photocurable ink compositions are used, then the ink composition can be applied for printing, but the glossiness of the cured film is insufficient
Solution Approach 1:
The patent changes the chemical parameters of the amine compounds used in the photocurable ink composition. Specifically, it uses a combination of amine compounds with and without hindered amine structures, where the amine without hindered amine structure has no radical-polymerizable group and the amine with hindered amine structure has specific structural characteristics. This parameter change optimizes the curability and surface quality to achieve high glossiness while maintaining reliability.
Solution Approach 2:
The patent employs a composite approach by combining multiple amine compounds with different structural characteristics in the ink composition. The composite material system includes amine compounds with hindered amine structures and amine compounds without hindered amine structures, working synergistically to achieve both good curability and high glossiness of the cured film.
2Stability of the object's composition
If amine compounds with hindered amine structure are used to improve storage stability, then the ink composition has good storage stability, but the glossiness of cured film is reduced
Solution Approach 1:
The patent merges the beneficial properties of different amine compounds by combining amine compounds with hindered amine structures (which provide storage stability) and amine compounds without hindered amine structures (which contribute to glossiness). The combination allows the ink composition to achieve both storage stability and high glossiness simultaneously.
Solution Approach 2:
The patent adjusts the parameters of the amine compound mixture, specifically controlling the ratio and types of amine compounds with and without hindered amine structures. This parameter optimization allows the system to achieve both storage stability and high glossiness by balancing the opposing effects of the different amine compound types.
3Stability of the object's composition
If radical polymerization is inhibited by oxygen to prevent premature curing, then the ink composition has good storage stability, but the curability across film thickness is reduced
Solution Approach 1:
The patent introduces amine compounds as intermediary substances that mediate between oxygen inhibition and curability requirements. The amine compounds without hindered amine structures act as intermediaries that can be readily polymerized by photopolymerization initiators even in the presence of oxygen, ensuring curability across the film thickness while maintaining storage stability through the presence of hindered amine structure compounds.
Solution Approach 2:
The patent changes the chemical environment parameters by introducing specific amine compounds that alter the reaction kinetics. The amine compounds modify the interaction between oxygen and the photopolymerization system, creating a parameter change that allows both storage stability (resistance to premature curing) and adequate curability (response to photopolymerization initiator) to coexist.
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 forms cured films with high glossiness, ensuring blocking resistance, scratch resistance, and adhesiveness while maintaining ejection stability for inkjet applications.
Implementation Method 1
a photocurable ink composition containing amine compounds with α-hydrogen atoms, including amine A with a hindered amine structure and amine B without a hindered amine structure, along with a sensitizer
Implementation Method 2
suppress radical polymerization inhibition by oxygen and enhance curability across the film thickness
Data Source
AI summary
Provided are a method for forming an image, and a photocurable ink composition including an amine A which is an amine compound having an α-hydrogen atom and a hindered amine structure, an amine B which is a tertiary amine compound that has an α-hydrogen atom, that has no hindered amine structure, and that has no radical-polymerizable group, at least one of a monofunctional radical-polymerizable monomer or a bifunctional radical-polymerizable monomer, and a sensitizer (D) which is at least one of a compound represented by formula (D1) or a compound represented by formula (D2), in which a total content of the monofunctional radical-polymerizable monomer and the bifunctional radical-polymerizable monomer is 50% by mass or more. R1 and R2 each independently represent a substituent, R3 to R8 each independently represent a hydrogen atom or a substituent, and n1 represents an integer of 0 to 5.