Inkjet Ink Metal Complexes Heat-Resistant Visibility
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Solution Overview
Problem
Existing inks for inkjet printers fail to maintain visibility of printing dots after heat treatment due to thermal degradation of color materials and poor dissolution stability of metallic salts and phthalocyanine-based metal complexes.
Innovation Solution
An inkjet printer ink comprising a color material with two metal complexes, each containing metal ions like iron, manganese, copper, or chromium ions bound to diketone ligands, which improves dissolution stability and maintains visibility after heat treatment by converting the metal ions into colored transition metal oxides.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If transition metal oxide is used as color material, then visibility of printing dots after heating is improved, but dissolution stability deteriorates causing precipitation
Solution Approach 1:
The patent uses transition metal salts (such as iron(III) chloride, chromium(III) chloride, manganese(II) chloride, cobalt(II) chloride, or copper(II) chloride) as intermediary substances that can be dissolved in the ink solvent. These salts serve as precursors that are converted into transition metal oxides during heat treatment, thereby achieving both good dissolution stability before printing and visibility after heating.
Solution Approach 2:
The patent changes the chemical state of the transition metal from oxide form (insoluble, visible after heating) to salt form (soluble, stable during storage). The conversion from salt to oxide occurs through parameter change in the form of heat treatment, transforming the material state to achieve the desired visibility while maintaining dissolution stability during the inkjet printing process.
2Stability of the object's composition
If metallic salt is added to improve dissolution stability, then dissolution stability is improved, but visibility after heating deteriorates due to thermal degradation
Solution Approach 1:
The patent performs preliminary action by selecting metallic salts with appropriate thermal stability characteristics before the heat treatment process. The salts are chosen and formulated in the ink composition in advance, ensuring they remain stable during storage and printing but can be reliably converted to visible oxides during the subsequent heat treatment step.
Solution Approach 2:
The patent utilizes parameter changes by controlling the heat treatment temperature and duration to transform the metallic salt into transition metal oxide. This parameter-controlled transformation ensures that the salt remains stable during storage (maintaining dissolution stability) but converts to visible oxide form under specific heating conditions (achieving visibility after printing).
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 achieves both high visibility and stability of printing dots under extensive heating conditions, preventing precipitation and ensuring color development across various temperature ranges.
Implementation Method 1
As a result of heating, a transition metal oxide is generated from a transition metal oxide precursor within printing dots. As a result, a transition metal oxide-derived color can be developed and visibility of printing dots can be maintained.
Data Source
AI summary
This invention provides an ink for inkjet printers with both properties; i.e., good visibility of printing dots after heating and high dissolution stability. The ink for inkjet printers of the invention comprises a color material, a solvent, and resin, wherein the color material comprises a first metal complex and a second metal complex comprising metal ions selected from among iron ions, manganese ions, copper ions, cobalt ions, and chromium ions and ligands bound thereto, and the ligands comprise diketone structures incorporated in the chemical structures thereof.