Active Energy Curable White Ink Composition Formulation
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Solution Overview
Problem
Existing active energy curable white ink compositions face challenges in achieving high whiteness, concealing properties, and curability while preventing image defects caused by satellite adhesion during high-speed printing.
Innovation Solution
An active energy curable white ink composition is formulated with a specific combination of a nitrogen atom-containing monofunctional monomer, a nitrogen atom-free monofunctional monomer with a glass transition temperature of 15 degrees or higher, a polyfunctional monomer, a polymerizable oligomer, an acylphosphine oxide-based polymerization initiator, and a white pigment, with controlled mass ratios to enhance curability, whiteness, and dischargeability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the proportion of polymerizable oligomer is increased to improve curability, then curability is enhanced, but satellite adhesion increases causing image defects
Solution Approach 1:
The patent applies parameter changes by precisely controlling the proportion of polymerizable oligomer to 0.2% by mass or less, and adjusting the proportion of acylphosphine oxide-based polymerization initiator to 6-10% by mass. These parameter optimizations resolve the contradiction by finding the optimal balance point where sufficient curability is achieved while satellite adhesion is minimized.
2Illumination intensity
If the proportion of white pigment is increased to improve whiteness and concealing properties, then whiteness and concealing properties are enhanced, but dischargeability deteriorates causing satellite adhesion
Solution Approach 1:
The patent optimizes the proportion of white pigment to 12-17% by mass, which is a carefully balanced parameter range. This optimization ensures sufficient whiteness and concealing properties for good color ink coloring while maintaining dischargeability to prevent satellite adhesion during high-speed printing.
3Reliability
If the proportion of acylphosphine oxide-based polymerization initiator is increased to improve curability, then curability is enhanced, but the composition complexity increases
Solution Approach 1:
The patent employs acylphosphine oxide-based polymerization initiator which serves multiple functions: it provides effective curability for the active energy curable white ink composition and maintains compatibility with high-speed printing processes. By selecting this specific initiator type with broad functionality, the patent achieves enhanced curability without proportionally increasing composition complexity.
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 excellent whiteness, concealing properties, and curability, reducing satellite adhesion and ensuring high-speed printing productivity without impairing color ink coloring, thereby preventing image defects.
Implementation Method 1
active energy curable white ink composition... acylphosphine oxide-based polymerization initiator
Data Source
AI summary
An active energy curable white ink composition contains a nitrogen atom-containing monofunctional monomer (A), a nitrogen atom-free monofunctional monomer (B) having a glass transition temperature of 15 degrees or higher, a polyfunctional monomer (C), a polymerizable oligomer (D), an acylphosphine oxide-based polymerization initiator (E), and a white pigment (F), wherein the proportion of (D) in the active energy curable white ink composition is 0.2% by mass or less, the proportion of (E) in the active energy curable white ink composition is from 6% to 10% by mass, and the proportion of (F) in the active energy curable white ink composition is from 12% to 17% by mass.