UV-Curable Inkjet Ink Composition for Adhesion and Low-Tack Printing
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Solution Overview
Problem
Existing active energy ray-curable inkjet ink compositions face issues with dischargeability from the inkjet head, adhesion to various base materials, curability, flexibility, image quality, and odor after curing, as well as surface tackiness and odor after curing.
Innovation Solution
An ink composition containing specific amounts of amine-modified oligomer, alicyclic skeleton-containing monofunctional monomer, 3-methyl-1,5-pentanediol diacrylate, and acryloylmorpholine, within defined ranges, to enhance discharge stability, adhesion, flexibility, and reduce surface tackiness and odor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional active energy ray-curable inkjet ink compositions are used, then printing can be performed, but adhesion between the printed layer and base material is not sufficiently obtained
Solution Approach 1:
The patent uses a composite monomer system combining alicyclic skeleton-containing monofunctional monomer (Tg: 10-60°C) with 3-methyl-1,5-pentanediol diacrylate and acryloylmorpholine. This composite approach creates synergistic effects where the alicyclic monomer provides adhesion and flexibility, while the other monomers contribute to curability and surface properties, resolving the contradiction between adhesion strength and overall printing performance.
Solution Approach 2:
The patent specifies precise compositional parameters: alicyclic skeleton-containing monofunctional monomer at 16.0% or more, 3-methyl-1,5-pentanediol diacrylate at 8.0-25.0%, and acryloylmorpholine at 3.0-15.0%. By controlling these parameter ranges, the formulation achieves optimal balance between adhesion, curability, and printing performance without sacrificing reliability.
2Strength
If high Tg oligomers are used to improve blocking resistance, then blocking resistance is improved, but dischargeability from inkjet head and flexibility are compromised
Solution Approach 1:
The patent selects monomers with specific Tg ranges (10-60°C for alicyclic skeleton-containing monofunctional monomer) rather than using high Tg oligomers. This parameter change maintains dischargeability and flexibility while achieving blocking resistance through the specific molecular structure and crosslinking density provided by the monomer composition.
Solution Approach 2:
The patent uses monomers with specific functional characteristics localized to provide different properties: alicyclic skeleton-containing monofunctional monomer for adhesion and blocking resistance, 3-methyl-1,5-pentanediol diacrylate for curability, and acryloylmorpholine for flexibility and odor reduction. Each component contributes locally to specific properties without compromising overall dischargeability.
3Object-generated harmful factors
If conventional ink compositions are used, then printing can be performed, but surface tackiness and odor after curing remain problematic
Solution Approach 1:
The patent incorporates acryloylmorpholine at 3.0-15.0% of total solid content, which specifically addresses odor reduction while maintaining curability. The morpholine structure provides low odor characteristics, and the acrylate functionality ensures proper curing, simultaneously reducing harmful factors without compromising reliability.
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 achieves improved LED curability, discharge stability, excellent adhesion to base materials, flexibility, high image quality, and reduced surface tackiness and odor, resulting in a comprehensive enhancement of printing performance.
Implementation Method 1
each of the ink droplets is cured by irradiation with light, so that a printed layer formed of a cured coating film is formed
Data Source
AI summary
[Object] To provide an active energy ray-curable inkjet ink composition that has excellent dischargeability from an inkjet head, forms a printed layer having excellent adhesion to various base materials, has excellent curability, has no tackiness on its surface after curing, has excellent flexibility when bent together with a base material, has excellent image quality after curing, and has little odor after curing. [Solution] An active energy ray-curable inkjet ink composition satisfying the following requirements (A) to (D) : (A) an amine-modified oligomer is contained in an amount of 1.0% to 20.0% by mass of the total solid content, (B) an alicyclic skeleton-containing monofunctional monomer that forms a polymer having a Tg of 10°C to 60°C when polymerized is contained in an amount of 16.0% or more by mass of the total solid content, (C) 3-methyl-1,5-pentanediol diacrylate is contained in an amount of 8.0% to 25.0% by mass of the total solid content, and (D) acryloylmorpholine is contained in an amount of 3.0% to 15.0% by mass of the total solid content.