Inkjet Ink Set with Flat Titanium Pigment for Uniform Durable Printing
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Solution Overview
Problem
Existing inkjet technologies struggle to form constant line width images with excellent scratch resistance on non-absorbent recording media due to uneven surface absorption and inadequate bonding of inks, particularly when using spherical titanium pigment particles and aqueous media.
Innovation Solution
The use of flat-shaped titanium pigment particles with a specific Young's modulus and a high-rigidity binder in a two-ink system, where the first ink forms a smooth background layer and the second ink adheres well to this layer, ensuring even spreading and enhanced scratch resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If spherical titanium pigment particles are used in aqueous ink, then the ink formulation is simple, but the image scratch resistance deteriorates
Solution Approach 1:
The patent changes the shape parameter of titanium pigment particles from spherical to flat, and optimizes the binder's Young's modulus to 600-1600 N/mm². These parameter changes enable the ink to achieve excellent scratch resistance on non-absorbent recording media while maintaining formulation simplicity.
2Ease of operation
If conventional inks are used on non-absorbent recording media, then the printing process is simple, but the line width uniformity deteriorates
Solution Approach 1:
The patent changes the shape parameter of titanium pigment particles to flat, which fundamentally alters the ink's spreading behavior on non-absorbent media. This parameter change enables constant line width images to be formed while maintaining a simple two-pass printing process.
3Strength
If high-rigidity binder is used with flat titanium pigment particles, then the scratch resistance improves, but the binder selection complexity increases
Solution Approach 1:
The patent defines a specific range for the binder's Young's modulus (600-1600 N/mm²) to achieve optimal balance between scratch resistance and processability. This quantitative parameter specification simplifies binder selection by providing clear criteria rather than requiring complex empirical testing.
Data Source
AI summary
An inkjet ink set includes a first ink and a second ink. The first ink contains first pigment particles, a first binder, and a first aqueous medium. The second ink contains second pigment particles, a second binder, and a second aqueous medium. The first pigment particles each include a titanium pigment particle in a flat shape. The first binder has a Young's modulus of at least 600 N/mm2 and no greater than 1600 N/mm2.