Active Energy Ray Curable Inkjet Ink for Dispersion Stability
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Solution Overview
Problem
Existing active energy ray curable inkjet inks, particularly those using C.I. pigment blue 15:6, face challenges in achieving stable dispersion, long-term storage, and discharge performance while minimizing corrosion to the epoxy adhesive in the inkjet head, which affects the durability of the inkjet head.
Innovation Solution
An active energy ray curable inkjet ink formulation combining C.I. pigment blue 15:6 with a quinacridone-based pigment, a specific pigment dispersing resin, and a quinacridone-based pigment derivative, along with a polymerizable compound like 2-(2-vinyloxyethoxy) ethyl acrylate, and a photopolymerization initiator, to enhance dispersion stability and reduce corrosion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If C.I. pigment blue 15:6 is used as the coloring material, then color reproducibility in the blue region is improved, but corrosion to the epoxy adhesive in the inkjet head increases, reducing durability
Solution Approach 1:
A pigment dispersant is introduced as an intermediary substance between C.I. pigment blue 15:6 and the epoxy adhesive in the inkjet head. The dispersant adsorbs onto the pigment surface and provides steric stabilization, preventing direct contact between the pigment and adhesive, thereby reducing corrosion while maintaining color reproducibility
Solution Approach 2:
The ink formulation uses a composite approach by combining C.I. pigment blue 15:6 with specifically selected polymerizable compounds and pigment dispersants. This composite material system reduces the corrosive effect on epoxy adhesive while maintaining the desired blue color properties, solving both color reproducibility and durability issues simultaneously
2Device complexity
If conventional process colors are used, then device complexity is reduced, but color reproducibility in highly designed designs is insufficient
Solution Approach 1:
The invention changes the chemical parameters of the ink formulation by using specific polymerizable compounds with controlled functionality and reactivity. This allows the ink to achieve excellent color reproducibility in the blue region while maintaining compatibility with standard inkjet printing systems, avoiding the need for complex specialized equipment
3Stability of the object's composition
If dispersion stability is enhanced through additional additives, then initial dispersion stability is improved, but the formulation complexity increases
Solution Approach 1:
The pigment dispersant provides localized stabilization at the pigment particle surface through adsorption. This local quality enhancement ensures excellent initial and long-term dispersion stability without requiring numerous bulk additives, keeping the overall formulation relatively simple while achieving the desired stability
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 formulation achieves improved initial and long-term dispersion stability, stable inkjet discharge, and reduced corrosion to the epoxy adhesive, resulting in high color reproducibility and clarity in the blue, green, and red regions.
Implementation Method 1
active energy ray curable inkjet ink comprising a pigment (A), a colorant derivative (B), a pigment dispersing resin (C) and a polymerizable compound (D)
Data Source
AI summary
An active energy ray curable inkjet ink comprising a pigment (A), a colorant derivative (B), a pigment dispersing resin (C) and a polymerizable compound (D), wherein the pigment (A) contains a C.I. pigment blue 15:6 and a quinacridone-based pigment at a specific amount and a specific ratio, the colorant derivative (B) contains a quinacridone-based pigment derivative, and the pigment dispersing resin (C) has an acid value and an amine value in a specific range.