Water-based Ink Formulation for Quinacridone Migration
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Solution Overview
Problem
Water-based magenta inks for ink-jet recording using quinacridone derivatives suffer from insufficient chromogenic properties and prominent migration issues, where the colorant seeps or bleeds beyond the recorded area.
Innovation Solution
A water-based ink formulation incorporating quinacridone or its derivatives along with a specific dye represented by formula (1), combined with a pigment dispersant containing an ethylene oxide chain, to enhance chromogenic properties and prevent migration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a water-based ink uses quinacridone derivative as colorant, then the color tone as magenta is improved, but the chromogenic property is insufficient
Solution Approach 1:
The patent combines quinacridone derivative (pigment) with specific dye components (formula 1) to create a hybrid colorant system. This merging allows the ink to achieve both the desired magenta color tone from the quinacridone and sufficient chromogenic properties from the dye, resolving the contradiction between color tone quality and chromogenic performance.
Solution Approach 2:
The invention uses composite colorant materials consisting of quinacridone derivative together with specific dye compounds having particular molecular structures (formula 1). This composite approach enables the ink to simultaneously achieve good color tone and adequate chromogenic properties that neither component could achieve alone.
2Manufacturing precision
If a water-based ink uses quinacridone derivative together with magenta dye to improve chromogenic property, then the chromogenic property is improved, but migration phenomenon becomes prominent
Solution Approach 1:
The patent carefully controls the molecular structure parameters of the dye component (formula 1), specifically the substituents R1-R6 and the number of sulfonic acid groups (n=0,1,2). By optimizing these structural parameters, the dye achieves sufficient chromogenic properties while maintaining appropriate molecular characteristics that prevent excessive migration on recording media.
Solution Approach 2:
The invention introduces specific functional groups (sulfonic acid groups with particular counterions) at specific positions on the dye molecule. This local modification of molecular quality enables the dye to achieve desired chromogenic properties at the molecular level while maintaining stability and reducing migration at the macroscopic level on the recording medium.
Data Source
AI summary
There is provided a water-based ink for ink-jet recording containing: water; at least one of quinacridone and a derivative thereof; and a dye represented by the following formula (1).