Composite Colored Particles for Stable Water-Based Ink Dispersion
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Solution Overview
Problem
Existing ink compositions for writing instruments suffer from dispersion stability issues, leading to settling out of coloring materials during storage, which results in changes in marking density and quality over time.
Innovation Solution
The use of composite colored particles formed by combining resin particles with positive electric charges, colored particles with negative electric charges, and low-density particles with negative electric charges through Coulomb forces, dispersed in a water-based medium, to enhance dispersion stability and writing performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If coloring materials are used in ink composition, then marking color is achieved, but settling out occurs during storage causing changes in marking density
Solution Approach 1:
The patent applies composite materials by combining resin particles with colored particles to form composite colored particles. This composite structure improves dispersion stability during storage while maintaining consistent marking density, resolving the contradiction between reliability and composition stability.
Solution Approach 2:
The patent changes physical parameters by controlling particle size, density, and surface charge of the composite colored particles. By adjusting these parameters, the ink composition achieves improved dispersion stability without settling out, thereby maintaining consistent marking density over time.
2Reliability
If polysaccharide complex is added to improve dispersion stability, then pigment settling is suppressed, but ink viscosity increases excessively
Solution Approach 1:
The patent changes the physical parameters of the coloring material by using composite colored particles with controlled size and density. This approach achieves dispersion stability without requiring excessive polysaccharide complex, thereby avoiding excessive viscosity increase and maintaining ease of operation.
Solution Approach 2:
By using composite colored particles instead of pure pigment particles, the patent achieves dispersion stability with reduced reliance on viscosity-increasing additives like polysaccharide complex, thus maintaining better flow properties and ease of operation.
3Reliability
If pigment is used as coloring material, then coloration is achieved, but pigment agglomerates and settles out under external heat and vibration
Solution Approach 1:
The patent creates composite colored particles by combining resin particles with colored particles. This composite structure reduces sensitivity to external heat and vibration, preventing agglomeration and settling out, thereby improving reliability under adverse environmental conditions.
Solution Approach 2:
The patent modifies physical parameters including particle density and surface charge of the colored particles. These parameter changes reduce the sensitivity to external heat and vibration, preventing the harmful effects of agglomeration and settling out during transport and 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
The ink composition exhibits excellent long-term dispersion stability, maintaining consistent marking density and preventing blurring, even after prolonged storage, thereby improving the performance of writing instruments like ballpoint pens and marking pens.
Implementation Method 1
a resin particle (3) carrying a positive electric charge on a particle surface, a colored particle (1) carrying a negative electric charge on a particle surface, and a low-density particle (2) carrying a negative electric charge on a particle surface, the resin particle, the colored particle, and the low-density particle forming a composite through the Coulomb force
Data Source
AI summary
A composite colored particle may include a resin particle carrying a positive electric charge on a particle surface, a colored particle carrying a negative electric charge on a particle surface, and a low-density particle, the colored particle and the low-density particle forming a composite with the resin particle through Coulomb force. A water-based ink composition may contain such composite colored particles dispersed in a water-based medium. A writing instrument may be loaded with such a water-based ink composition.