Inkjet Ink Composition Reducing Migration and Odor
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Solution Overview
Problem
Conventional actinic ray-curing type inkjet printing faces issues with component migration, strong odor, and shrinkage, particularly in package printing, where unreacted monomers and polymerization initiators can migrate to the content, causing blurring and odor transfer, and the thin recording media used in food packaging exacerbate these problems.
Innovation Solution
An inkjet ink composition containing a polyfunctional (meth)acrylate compound, 1-[4-(4-benzoylphenylsulfanyl)phenyl]-2-methyl-2-(4-methylphenylsulfonyl)propan-1-one, and a compound represented by specific formulas, with a polymerization initiator of low molecular weight, which forms a crosslinked structure to reduce migration and odor, and enhances curability and blocking resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional actinic ray-curing type inkjet printing is used, then curability is improved, but component migration and odor increase
Solution Approach 1:
The patent changes the molecular weight parameter of the polymerization initiator from conventional low molecular weight to high molecular weight (500-3000), which fundamentally alters the behavior of the curing system. This parameter change reduces component migration and odor while maintaining curability, as the larger initiator molecules are less prone to migrate and volatilize.
Solution Approach 2:
The patent uses a composite polymerization initiator system comprising both a high molecular weight initiator (500-3000) and a low molecular weight initiator (less than 500), where the low molecular weight initiator content is strictly limited to 1.0% or less. This composite approach balances curability (provided by the low MW initiator) with reduced migration and odor (provided by the high MW initiator).
2Productivity
If thin recording media are used for package printing, then productivity is improved, but shrinkage and component migration worsen
Solution Approach 1:
The patent changes the molecular weight parameter of the polymerization initiator to high molecular weight (500-3000), which reduces the aggressiveness of the curing reaction. This parameter change allows thin recording media to be cured effectively without excessive shrinkage, maintaining manufacturing precision while enabling productivity gains from using thin materials.
3Reliability
If high polymerization initiator content is used, then curability is improved, but component migration and odor increase
Solution Approach 1:
The patent changes the molecular weight parameter of the polymerization initiator from low to high (500-3000), which allows for reduced overall initiator content while maintaining curability. The high molecular weight initiators are more efficient and produce less migration and odor, enabling the patent to reduce the quantity of substance (initiator content) while improving curability and reducing harmful effects.
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 effectively reduces component migration, suppresses odor, and improves curability and blocking resistance, ensuring high-quality prints on thin recording media without significant shrinkage, making it suitable for package printing.
Implementation Method 1
an ink composition for inkjet recording that can be cured by irradiation of radiation such as ultraviolet rays (radiation-curable ink composition for inkjet recording) has a property in which most of the components of the ink composition are cured by irradiation of radiation such as ultraviolet rays
Data Source
AI summary
The ink-jet ink composition contains (Component A) a polyfunctional (meth)acrylate compound, (Component B) 1-[4-(4-benzoylphenylsulfanyl)phenyl]-2-methyl-2-(4-methylphenylsulfonyl)propan-1-one, and (Component C) a compound represented by the following Formula (1) or Formula (2), in which a content of polymerization initiator having a molecular weight of less than 340 is equal to or smaller than 1.0% by mass with respect to a total amount of the ink composition.