Actinic Ray Curable Ink Composition for Cardboard
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Solution Overview
Problem
Existing photocurable inkjet inks face challenges such as curing wrinkles, odor generation, poor curability, tackiness, and inadequate bending tolerance, abrasion resistance, and water resistance on cardboard and paper-based materials.
Innovation Solution
An active energy ray-curable inkjet printing ink composition is developed, comprising specific ranges of amine-modified oligomer, alkoxy group-containing (meth)acrylate monomers, (meth)acrylate monomers with alkyl groups, and photopolymerization initiators, which together achieve low viscosity, odor-free curing, excellent curability, and enhanced mechanical and water resistance properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If photocurable inkjet inks are used for printing on cardboard and paper-based materials, then curability is improved, but curing wrinkles and odor generation occur
Solution Approach 1:
The patent changes the chemical parameters of the ink composition by specifying precise ranges for amine-modified oligomer (1.0-20.0% by mass), alkoxy group-containing (meth)acrylate monomers (2.0-20.0% by mass), and photopolymerization initiators (6.0-25.0% by mass). These parameter adjustments optimize the curing reaction to eliminate wrinkles and reduce odor while maintaining excellent curability on paper-based substrates.
Solution Approach 2:
The patent creates a composite ink formulation by combining multiple functional components: amine-modified oligomers (for flexibility and adhesion), alkoxy group-containing (meth)acrylate monomers (for low viscosity and odor-free curing), long-chain (meth)acrylate monomers (for bending tolerance), and specific photopolymerization initiators. This composite approach resolves the contradiction by balancing curability with defect-free performance.
2Reliability
If ink composition is optimized for curability, then curing performance is improved, but viscosity increases and printing performance deteriorates
Solution Approach 1:
The patent optimizes the ratio parameters between different components: amine-modified oligomer (1.0-20.0% by mass) balanced with alkoxy group-containing (meth)acrylate monomers (2.0-20.0% by mass). This parameter optimization ensures low viscosity for excellent printing performance while maintaining high curability through the synergistic effect of the photopolymerization initiator system (6.0-25.0% by mass).
3Stability of the object's composition
If ink composition provides good flexibility, then bending tolerance is improved, but abrasion resistance and water resistance deteriorate
Solution Approach 1:
The patent formulates a composite polymer network by combining amine-modified oligomers (providing flexibility and bending tolerance) with long-chain (meth)acrylate monomers having 6-20 carbon atoms (providing abrasion and water resistance). The photopolymerization initiators catalyze the formation of a crosslinked structure that simultaneously achieves flexibility and durability, resolving the contradiction between bending tolerance and mechanical strength.
4Productivity
If existing ink compositions are used, then basic printing function is achieved, but environmental conservation requirements are not met due to material waste
Solution Approach 1:
The patent changes the chemical composition parameters to eliminate harmful byproducts: the specific ratio of amine-modified oligomer (1.0-20.0% by mass) to photopolymerization initiators (6.0-25.0% by mass) ensures complete polymerization with minimal unreacted monomers and no harmful odors. The alkoxy group-containing monomers (2.0-20.0% by mass) provide low viscosity for efficient jetting, reducing material waste and improving environmental performance while maintaining printing productivity.
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 demonstrates low viscosity, no odor after curing, excellent curability, no tackiness, and superior bending tolerance, abrasion resistance, and water resistance, making it suitable for printing on cardboard and paper-based materials.
Implementation Method 1
as photopolymerization initiators, ethoxy(2,4,6-trimethylbenzoyl)phenylphosphine oxide is contained by 3.0 to 15.0% by mass in the active energy ray-curable inkjet printing ink composition
Data Source
AI summary
An object is to provide an active energy ray-curable inkjet printing ink composition that can demonstrate the effects of low viscosity, with its coating film generating no odor once cured while exhibiting excellent curability and no tackiness, and cured coating film demonstrating excellent bending tolerance property, abrasion resistance, and water resistance. As a solution, an active energy ray-curable inkjet printing ink composition satisfying requirements A to E below is provided: (A) the content of amine-modified oligomer is 1.0 to 20.0% by mass in the active energy ray-curable inkjet printing ink composition; (B) alkoxy group-containing (meth)acrylate monomers are contained by 2.0 to 20.0% by mass in the active energy ray-curable inkjet printing ink composition; (C) (meth)acrylate monomers having an alkyl group with 6 to 20 carbon atoms is contained by 2.0 to 25.0% by mass in the active energy ray-curable inkjet printing ink composition; (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, 1,10-decanediol diacrylate, propoxylated(2)neopentyl glycol diacrylate, and hydroxypivalic acid neopentyl glycol diacrylate is contained by 30.0 to 60.0% by mass in the active energy ray-curable inkjet printing ink composition; (E) as photopolymerization initiators, ethoxy(2,4,6-trimethylbenzoyl)phenylphosphine oxide is contained by 3.0 to 15.0% by mass in the active energy ray-curable inkjet printing ink composition, and oligo(2-hydroxy-2-methyl-1-(4-(1-methylvinyl)phenyl)propanone) and/or 2-hydroxy-1 - {4-[4-(2-hydroxy-2-methylpropionyl)phenoxy]phenyl} -2-methylpropanone is/are contained by 2.0 to 10.0% by mass in the active energy ray-curable inkjet printing ink composition, where the total content of photopolymerization initiators is 6.0 to 25.0% by mass in the active energy ray-curable inkjet printing ink composition.