Active Energy Ray-Curable Ink Composition for LED Curing
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Solution Overview
Problem
Existing active energy ray-curable inkjet ink compositions lack versatility in compatibility with various base materials, particularly polycarbonate and polyvinyl chloride, and do not provide adequate hardness, rub resistance, and water resistance for the cured coating film.
Innovation Solution
An active energy ray-curable inkjet ink composition containing Pigment Violet 19 and Pigment Orange 71, with specific pigment ratios and a combination of polymerizable components, including multifunctional amine-modified oligomers and monofunctional monomers, to enhance color development, hardness, and resistance properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional active energy ray-curable inkjet ink compositions are used, then storage stability and basic effectiveness are maintained, but compatibility with various base materials (polycarbonate, polyvinyl chloride) is insufficient and the cured coating film lacks adequate hardness, rub resistance, and water resistance
Solution Approach 1:
The patent employs a multifunctional amine-modified oligomer that simultaneously provides adhesion to multiple base materials (polycarbonate, polyvinyl chloride, and others), hardness, and resistance properties. This single component performs multiple functions that were previously required from separate additives, enabling the ink composition to be universally compatible with diverse base materials while maintaining reliable performance.
Solution Approach 2:
The patent creates a composite ink composition by combining the multifunctional amine-modified oligomer with photopolymerizable monomers and pigments. This composite formulation integrates the adhesive and protective properties of the oligomer with the curing characteristics of photopolymerizable components, resulting in a coating film that exhibits both broad material compatibility and enhanced mechanical properties including hardness and resistance to rubbing and water.
2Manufacturing precision
If the ink composition is optimized for color development, then optical density and color properties improve, but compatibility with various base materials and performance of cured coating film may be compromised
Solution Approach 1:
The patent merges the color development function (provided by pigments) with the adhesion and protection functions (provided by the multifunctional amine-modified oligomer) into a single integrated ink composition. The pigments deliver optimal optical density and color properties, while the oligomer simultaneously ensures compatibility with various base materials and provides enhanced hardness and resistance. These previously separate functions are combined in a unified formulation that achieves all objectives without compromise.
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 sufficient curing with LED light, high hardness, and excellent rub and water resistance, with improved optical density and color development properties.
Implementation Method 1
an active energy ray-curable inkjet printing ink composition which contains monofunctional and multifunctional photopolymerizable compounds
Data Source
AI summary
An object of the present invention is to obtain an active energy ray-curable inkjet ink composition designed to improve color development property and to be LED curable, and designed so that a cured coating film has high hardness and excellent rub resistance and water resistance. As a solution, the ink composition contains a pigment, a pigment dispersant, and a photopolymerizable compound, wherein the pigment contains Pigment Violet 19 and Pigment Orange 71, and Pigment Violet 19 is 30.0 to 85.0% by mass relative to a total mass of Pigment Violet 19 and Pigment Orange 71, and the photopolymerizable compound satisfies all of the following requirements (A) to (F): (A) a multifunctional amine-modified oligomer is contained by 0.20 to 15.0% by mass in a total amount of all polymerizable components; (B) a monofunctional monomer is contained by 50.0% by mass or more in the total amount of all polymerizable components; (C) a monofunctional monomer whose glass transition temperature is 20°C or more is contained by 35.0% by mass or more in the total amount of all polymerizable components; (D) a monofunctional monomer whose glass transition temperature is 10°C or less is contained by 35.0% by mass or more in the total amount of all polymerizable components; (E) a multifunctional monomer whose glass transition temperature is 10°C or less is contained by 2.0 to 11.0% by mass in the total amount of all polymerizable components; and (F) a nitrogen-containing monofunctional monomer is contained by 10.0 to 25.0% by mass in the total amount of all polymerizable components.