Aqueous Yellow Ink Dispersion for Stable High-Chroma Jetting
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Solution Overview
Problem
Existing ink jet recording technologies face challenges in achieving high ejection stability and storage stability while recording images with high chromaticity in the yellow region, particularly when using fluorescent coloring materials, due to issues like concentration quenching and aggregation of pigment particles.
Innovation Solution
An aqueous ink formulation containing C.I. Pigment Yellow 101 and a resin dispersant with aromatic and anionic groups is used, which enhances electrostatic repulsion and maintains pigment dispersion, thereby improving ejection stability and storage stability, and allowing for high chromaticity in yellow images.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a sufficient amount of fluorescent coloring material is added to the ink to record an image with high chromaticity, then the chromaticity of the recorded image is improved, but the ejection stability and storage stability deteriorate due to pigment aggregation and concentration quenching
Solution Approach 1:
A resin dispersant with aromatic groups and anionic groups is introduced as an intermediary substance between the fluorescent pigment particles and the aqueous medium. The aromatic groups interact with the pigment surface while the anionic groups provide electrostatic repulsion, preventing aggregation and maintaining both high chromaticity and ejection stability
Solution Approach 2:
The invention changes the chemical parameters of the dispersant system by specifically selecting resin dispersants with aromatic groups (for pigment interaction) and anionic groups (for electrostatic repulsion). This parameter change enables the system to maintain pigment dispersion at high concentrations without aggregation, resolving the contradiction between chromaticity and ejection stability
2Illumination intensity
If a sufficient amount of fluorescent coloring material is added to the ink to record an image with high chromaticity, then the chromaticity of the recorded image is improved, but the storage stability deteriorates due to pigment aggregation
Solution Approach 1:
The resin dispersant acts as a protective intermediary that surrounds and separates pigment particles during storage. The anionic groups create electrostatic repulsion barriers that prevent pigment aggregation over time, while the aromatic groups maintain strong adsorption to the pigment surface, ensuring long-term storage stability even at high pigment concentrations
Solution Approach 2:
The invention creates a composite dispersion system combining fluorescent pigment particles with resin dispersant molecules. This composite structure provides both the fluorescent properties needed for high chromaticity and the steric/electrostatic protection needed for long-term storage stability
3Illumination intensity
If offset printing is used to record a fluorescent color image with high chromaticity through overprinting, then the chromaticity is improved, but the productivity deteriorates
Solution Approach 1:
The invention changes the ink formulation parameters to enable single-pass fluorescent yellow recording. By optimizing the pigment concentration, resin dispersant selection (with aromatic and anionic groups), and aqueous medium composition, the system achieves high chromaticity in a single printing pass, eliminating the need for multiple overprinting operations required by offset printing
4Manufacturing precision
If the ink contains materials such as coloring materials and resins to affect performance, then the recording performance is improved, but the ejection stability deteriorates due to restrictions on physical properties
Solution Approach 1:
The invention optimizes the physical and chemical parameters of the ink system by selecting specific resin dispersants with aromatic groups for pigment interaction and anionic groups for electrostatic stabilization. This parameter optimization enables the coexistence of high pigment concentration (for recording performance) and low viscosity/good flow characteristics (for ejection stability)
Solution Approach 2:
The resin dispersant serves as a mediator that reconciles the conflicting requirements of high pigment loading and good ejection properties. It provides steric and electrostatic stabilization that prevents aggregation, allowing the ink to maintain both high recording performance and reliable ejection from fine nozzles
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 stable ejection and long-term storage while producing images with high chromaticity in the yellow region by preventing pigment aggregation and concentration quenching, ensuring consistent ink performance.
Implementation Method 1
the resin dispersant has a unit with an aromatic group and a unit with an anionic group
Data Source
AI summary
An aqueous ink containing a pigment (C.I. Pigment Yellow 101) and a resin dispersant for the pigment. The resin dispersant has a unit with an aromatic group and a unit with an anionic group.