Ink Composition J-Aggregate Infrared Absorption
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Solution Overview
Problem
Inkjet printing technologies face challenges in achieving infrared absorbing images with excellent rub resistance, light fastness, and jetability, as existing solutions like oxonol colorants have limitations in stability and absorption capacity.
Innovation Solution
An ink composition for inkjet printing is developed, comprising a specific oxonol colorant, resin particles, and a water-soluble organic solvent, which forms a J-aggregate to enhance stability and light fastness, and includes self-dispersing resin particles to improve dot shape and ink stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If oxonol colorants are used to form infrared absorbing images, then infrared absorption capacity is improved, but rub resistance and light fastness deteriorate
Solution Approach 1:
The patent uses a composite ink composition containing oxonol colorant (for infrared absorption), resin particles (for stability and rub resistance), and water-soluble organic solvent (for jetability). This composite approach allows the ink to simultaneously achieve high infrared absorption capacity while maintaining excellent rub resistance and light fastness through the synergistic effects of its components.
2Quantity of substance
If ink composition is optimized for infrared absorption, then absorption capacity is improved, but jetability deteriorates
Solution Approach 1:
The patent carefully controls the concentration parameters of each component: oxonol colorant (0.1-10 mass%), resin particles (1-20 mass%), and water-soluble organic solvent (5-50 mass%). By optimizing these parameter ranges, the ink achieves both high infrared absorption capacity and excellent jetability, as the solvent content ensures proper flow characteristics while the colorant concentration provides sufficient absorption.
3Stability of the object's composition
If resin particles are added to improve stability, then ink stability is improved, but dot shape quality deteriorates
Solution Approach 1:
The patent specifies that resin particles should have a particle size of 0.1-10 μm, creating local quality differentiation where the particle size is optimized to be small enough not to interfere with dot shape formation, yet large enough to provide stability. This local optimization allows the resin to enhance ink stability while maintaining excellent dot shape quality.
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 achieves improved rub resistance, light fastness, and ink stability, ensuring high-quality infrared absorbing images with enhanced absorption capacity and jetability.
Implementation Method 1
By using a specific oxonol colorant and, the ink composition achieves improved rub resistance, light fastness, and ink stability, ensuring high-quality infrared absorbing images with enhanced absorption capacity and jetability.
Implementation Method 2
an ink composition for ink jet printing with which an infrared absorbing image having excellent rub resistance, light fastness, and infrared absorption capacity can be obtained
Data Source
Figure 1
AI summary
Provided are an ink composition for ink jet printing, and an image forming method and a recorded material using the ink composition for ink jet printing. The ink composition for ink jet printing includes: a colorant represented by the following Formula 1; resin particles; a water-soluble organic solvent; and water. In Formula 1, Y1 and Y2 each independently represent a non-metal atomic group which forms an aliphatic ring or a heterocycle, M+ represents a proton or a monovalent alkali metal cation or organic cation, L1 represents a methine chain consisting of 5 or 7 methine groups, and a methine group at a center of the methine chain has a specific substituent.