Ray-Curable Inkjet Ink Composition for Wrinkle-Free Flexible Films
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Solution Overview
Problem
Existing active energy ray-curable inkjet inks face issues with curing wrinkles, odor, and lack of bending tolerance, especially when used on cardboard, and there is a need for ink compositions using biomass materials.
Innovation Solution
An ink composition comprising specific ratios of acrylated amine compounds, alkoxy group-containing (meth)acrylate monomers, (meth)acrylate monomers with 10 to 20 carbon atoms, plant oil-derived 1,10-decanediol diacrylate, and photopolymerization initiators, along with optional hydroxyl group-containing (meth)acrylate monomers and vinyl monomers, to achieve low viscosity, excellent curability, and bending tolerance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional active energy ray-curable inkjet inks are used, then printing can be performed, but curing wrinkles occur in the cured film
Solution Approach 1:
The patent changes the chemical composition parameters of the ink by incorporating specific ratios of plant oil-derived diacrylates (30-60%), acrylated amine compounds (1-20%), and various (meth)acrylate monomers. This parameter optimization prevents curing wrinkles while maintaining curability, resolving the contradiction between reliable curing and surface flatness.
2Object-affected harmful factors
If biomass materials are used in ink composition, then environmental friendliness is improved, but odor increases
Solution Approach 1:
The patent creates a composite ink formulation combining plant oil-derived 1,10-decanediol diacrylate with synthetic (meth)acrylate monomers and acrylated amine compounds. This composite approach maintains the environmental benefits of biomass materials while the synergistic composition controls odor, resolving the contradiction between environmental friendliness and odor generation.
3Reliability
If ink composition is optimized for curability, then active energy ray curability is improved, but bending tolerance property deteriorates
Solution Approach 1:
The patent applies local quality by using acrylated amine compounds (1-20%) that provide flexible crosslinking in the cured network, alongside plant oil-derived diacrylates (30-60%) for curability. This creates regions of different mechanical properties within the cured film, achieving both excellent curability and bending tolerance simultaneously.
4Quantity of substance
If plant oil-derived 1,10-decanediol diacrylate is used in high content, then biomass content is improved, but viscosity increases
Solution Approach 1:
The patent optimizes the concentration parameter of plant oil-derived 1,10-decanediol diacrylate to 30-60% by mass, balancing biomass content with viscosity control. This parameter optimization, combined with the inclusion of other monomers, maintains both high biomass content and acceptable viscosity for inkjet printing.
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 provides low odor, prevents curing wrinkles, and exhibits excellent curability and bending tolerance, suitable for printing on cardboard with minimal environmental impact.
Implementation Method 1
active energy ray-curable inkjet printing ink composition
Data Source
AI summary
An active energy ray-curable inkjet printing ink composition satisfies (A) to (E) below, where the total content of (D) and (E) accounts for 30.0 to 60.0% by mass: (A) an acrylated amine compound having two photopolymerizable functional groups and two amino groups in a molecule is contained by 1.0 to 20.0% by mass; (B) alkoxy group-containing (meth)acrylate monomers are contained by 2.0 to 20.0% by mass; (C) a (meth)acrylate monomer containing an alkyl group with 10 to 20 carbon atoms is contained by 2.0 to 25.0% by mass; (D) at least one type selected from the group that consists of 1,6-hexanediol diacrylate, 3-methyl-1,5-pentanediol diacrylate, dipropylene glycol diacrylate, propoxylated(2)neopentyl glycol diacrylate, and hydroxypivalic acid neopentyl glycol diacrylate is contained by 5.0 to 25.0% by mass; and (E) a plant oil-derived 1,10-decanediol diacrylate is contained by 10.0 to 40.0% by mass.