Ink Jet Ink Composition Suppressing Foreign Materials
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Solution Overview
Problem
Existing ink jet ink compositions struggle to effectively suppress the generation of foreign materials, particularly when using specific pigments, as the elution of causative substances is not adequately controlled.
Innovation Solution
The ink jet ink composition includes an acetoacetanilide-based monoazo pigment coated with a water-insoluble polymer and 1-(2-hydroxyethyl)-2-pyrrolidone, which together suppress the generation of foreign materials by reducing pigment elution and enhancing dispersion stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a specific pigment is used in ink composition, then color development is improved, but foreign materials are generated due to pigment elution
Solution Approach 1:
A dispersant comprising a specific compound (Formula 1) is introduced as an intermediary substance between the pigment and the ink vehicle. This dispersant specifically adsorbs to the pigment surface, forming a stable interface that prevents pigment elution and aggregation, thereby eliminating foreign material generation while preserving color development properties
Solution Approach 2:
The chemical structure of the dispersant is specifically designed with particular molecular weight range (500-5000) and functional group composition to optimize its interaction with the pigment. By controlling these parameters, the dispersant forms a stable protective layer around pigment particles, preventing them from eluting and forming foreign materials during storage and printing
2Manufacturing precision
If pigment concentration is increased to improve image quality, then color saturation is improved, but foreign material generation increases
Solution Approach 1:
The dispersant acts as a protective intermediary that enables higher pigment concentrations to be maintained without foreign material generation. By forming a stable adsorption layer on pigment surfaces, the dispersant prevents pigment-pigment interactions that would otherwise lead to aggregation and foreign material formation, even at high pigment loadings
3Duration of action of stationary object
If storage time is extended to ensure ink availability, then ink utilization is improved, but foreign materials are generated over time
Solution Approach 1:
The dispersant is pre-added to the ink composition during manufacturing to establish protective adsorption layers on pigment surfaces before storage begins. This preliminary protective action prevents pigment elution and aggregation during extended storage periods, eliminating foreign material generation throughout the entire storage duration
Solution Approach 2:
The dispersant serves as a long-term protective intermediary that maintains pigment stability throughout extended storage. Its specific molecular structure enables sustained adsorption on pigment surfaces, continuously preventing elution and foreign material formation even after months of storage
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
This composition effectively suppresses the generation of foreign materials, even during long-term storage, while maintaining excellent color development and glossiness properties in printed images.
Implementation Method 1
an acetoacetanilide-based monoazo pigment coated with a water-insoluble polymer
Implementation Method 2
1-(2-hydroxyethyl)-2-pyrrolidone
Data Source
AI summary
An ink jet ink composition includes: an acetoacetanilide-based monoazo pigment coated with a water-insoluble polymer; 1-(2-hydroxyethyl)-2-pyrrolidone; and water.