Active Ray-Curable Ink Composition for Package Printing

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Solution Overview

Problem

Existing ink-jet recording technologies face issues with high elution of components from cured films, strong odors, and shrinkage, particularly in package printing, where the migration of unreacted monomers and polymerization initiators leads to contamination and aesthetic issues.

Innovation Solution

An active ray curable ink-jet ink composition comprising a polyfunctional (meth)acrylate compound, a bis(acyl)phosphine compound, and specific polymerization initiators, which form a cross-linked structure to minimize component migration and odor, while maintaining high curing sensitivity and blocking resistance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional polymerization initiators with molecular weight less than 340 are used, then curability is improved, but component elution and odor increase

Engineering Contradiction:

ImprovecurabilityVSAvoidcomponent elution and odor

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The patent changes the molecular weight parameter of polymerization initiators from less than 340 to 340 or more, which fundamentally alters the elution behavior while maintaining curability through optimized initiator selection (bis(acyl)phosphine and α-aminoketone compounds)

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent uses composite polymerization initiator systems combining bis(acyl)phosphine compounds and α-aminoketone compounds with specific molecular weights, creating a synergistic effect that maintains high curability while suppressing component elution and odor

Inventive Principle:

Principle #40Composite materials

2Reliability

If high concentrations of polymerization initiators are used, then curability is improved, but component migration increases

Engineering Contradiction:

ImprovecurabilityVSAvoidcomponent migration

Core Design Contradiction:

ReliabilityVSLoss of substance

Solution Approach 1:

The patent optimizes the concentration parameter of polymerization initiators to 1-10 mass% range, balancing curability with minimal component migration by selecting initiators with molecular weight ≥340 that have lower volatility and migration tendency

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent employs polymerization initiators that are completely consumed during the curing reaction, leaving minimal residues that could migrate, thereby reducing long-term component migration issues

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

3Productivity

If thin-film packaging materials are used, then productivity is improved, but shrinkage and blocking resistance deteriorate

Engineering Contradiction:

Improveprinting efficiencyVSAvoidshrinkage and blocking resistance

Core Design Contradiction:

ProductivityVSStability of the object's composition

Solution Approach 1:

The patent employs composite ink formulations combining polyfunctional (meth)acrylate compounds with specific polymerization initiators, creating a cured film with enhanced mechanical properties including shrinkage resistance and blocking resistance even on thin-film substrates

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent optimizes the functional group composition and molecular structure parameters of (meth)acrylate compounds to achieve films with appropriate cross-linking density that maintains flexibility and resistance to shrinkage and blocking

Inventive Principle:

Principle #35Parameter changes

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 reduced component migration, suppressed odor, and improved blocking resistance, ensuring that printed materials do not shrink significantly and maintain quality, especially in thin-film package printing applications.

Implementation Method 1

an active ray curable ink-jet ink composition which can be cured by irradiation of radiation such as ultraviolet rays

Methodology Applied

Scientific EffectPhotopolymerization: Photopolymerisation

Data Source

PatentEP2832804B1Active ray-curable inkjet ink composition, inkjet recording method, and printed matter

Publication Date: 2019.02.27 FUJIFILM CORP

AI summary

The active ray curable ink-jet ink composition contains (component A) a polyfunctional (meth)acrylate compound; (component B-1) a bis(acyl)phosphine compound having a molecular weight of 340 or more and/or an ±-aminoketone compound having a molecular weight of 340 or more; and (component B-2) a compound represented by the following formula (1) or (2), in which a polymerization initiator having a molecular weight of less than 340 is not contained or the content of the polymerization initiator having a molecular weight of less than 340 is less than or equal to 1% by mass based on the entire ink composition.