White Ink Composition Acylphosphine Initiator Stability
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Solution Overview
Problem
Existing inkjet recording technologies face challenges in achieving high curability and color stability under high temperature and high humidity conditions, with conventional white ink compositions experiencing discoloration over time.
Innovation Solution
A white ink composition for inkjet recording is developed, comprising an acylphosphine-based photopolymerization initiator and a monomer with a heterocyclic skeleton, which includes a specific range of acylphosphine oxide compounds and monomers like N-vinylcaprolactam, providing excellent curability and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional white ink compositions are used, then the ink can be applied to recording media, but the ink experiences discoloration and coloration over time especially in high temperature and high humidity environments
Solution Approach 1:
The patent changes the chemical parameters of the ink composition by introducing specific photopolymerization initiators (acylphosphine oxide compounds) and heterocyclic monomers that are resistant to degradation under high temperature and humidity conditions. This chemical parameter change prevents the discoloration and coloration issues experienced by conventional inks, thereby improving color stability and chemical stability simultaneously.
Solution Approach 2:
The patent creates a composite ink system by combining multiple components: acylphosphine oxide photopolymerization initiators, heterocyclic monomers (such as N-vinylcaprolactam), and appropriate colorants. This composite formulation synergistically improves both color stability and chemical stability, as each component contributes to the overall resistance against environmental degradation.
2Productivity
If the ink composition is optimized for curability, then polymerization efficiency improves, but the complexity of the formulation increases
Solution Approach 1:
The patent optimizes the concentration parameters of the photopolymerization initiator and monomer components to achieve rapid and complete curing. By carefully controlling the ratio and amount of each component, the formulation achieves high curing efficiency without requiring overly complex multi-component systems, thus balancing productivity with formulation simplicity.
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 exhibits enhanced curability and suppressed coloration over time, even in high temperature and high humidity environments, ensuring improved image quality and durability.
Implementation Method 1
an acylphosphine-based photopolymerization initiator... a monomer having a heterocyclic skeleton... UV-curing ink... actinic radiation curing inkjet ink
Data Source
AI summary
A white ink composition for inkjet recording is provided that includes an acylphosphine-based photopolymerization initiator, a monomer having a heterocyclic skeleton, and a white colorant, the acylphosphine-based photopolymerization initiator having a content of 10 to 18 wt % relative to the ink composition. There are also provided an inkjet recording method that includes a step of discharging the white ink composition for inkjet recording onto a recording medium and a step of curing the white ink composition by irradiating the discharged white ink composition with actinic radiation, and a printed material formed by the inkjet recording method.