Ink Composition with Tertiary Amine for Curing Stability
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Solution Overview
Problem
Cationic polymerization inks used for inkjet recording have insufficient storage stability due to acid generation, and the addition of basic compounds to improve stability impairs light exposure functions, reducing curing sensitivity.
Innovation Solution
An ink composition featuring a polymer with a fluorine-substituted hydrocarbon group, siloxane skeleton, long-chain alkyl group, radical polymerizable group, and tertiary amine structure, which enhances curing sensitivity, rubbing resistance, and blocking properties, while maintaining surface stickiness control and flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If basic compounds are added to improve storage stability, then storage stability is improved, but curing sensitivity decreases
Solution Approach 1:
The patent removes basic compounds from the ink composition entirely, replacing them with a polymer containing tertiary amine groups that provide stability without interfering with photoinitiator function. This extraction of the harmful basic compound while retaining beneficial properties resolves the contradiction between storage stability and curing sensitivity.
Solution Approach 2:
The patent introduces a specific polymer as an intermediary substance that contains tertiary amine groups for neutralizing acid without directly interfering with the photoinitiator system. This intermediary polymer mediates between the need for storage stability and the requirement for high curing sensitivity, allowing both requirements to be satisfied simultaneously.
2Strength
If cationic polymerization ink is used, then adhesiveness is improved, but storage stability deteriorates due to acid generation
Solution Approach 1:
The patent changes the chemical composition parameters by using a polymer with specifically designed properties: tertiary amine groups for acid neutralization, hydrophobic groups for water resistance, and controlled molecular weight. These parameter changes enable the ink to achieve both adhesiveness and storage stability without requiring basic compounds that would compromise curing sensitivity.
3Productivity
If inkjet recording efficiency is improved by using radiation-curable ink, then printing speed is improved, but image quality deteriorates due to insufficient curing
Solution Approach 1:
The patent incorporates a photoinitiator system that enables immediate curing upon light exposure, along with a polymer formulation that ensures complete and rapid polymerization. This preliminary preparation of the ink composition with appropriate curing agents and reactive groups ensures that curing occurs completely and quickly, maintaining both high printing speed and excellent image 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 ink composition achieves high curing sensitivity, excellent rubbing resistance, and controlled surface stickiness, improving storage stability and image durability without compromising light exposure functions.
Implementation Method 1
a radical polymerizable group; favorable curing sensitivity... by irradiation with a radiation ray such as an ultraviolet ray
Implementation Method 2
a tertiary amine structure... has favorable curing sensitivity, excellent rubbing resistance and blocking properties... improving storage stability
Data Source
AI summary
This invention provides an ink composition capable of forming an image which has favorable curing sensitivity, is excellent in rubbing resistance and blocking properties, and has controlled surface stickiness and improved surface curing properties, an inkjet recording method using the ink composition, and a printed material; and the ink composition containing a polymer (a) including a partial structure selected from the group consisting of fluorine-substituted hydrocarbon group, a siloxane skeleton group, and a long-chain alkyl group; a radical polymerizable group, and a tertiary amine structure.