Ink Composition IOB Parameter Optimization
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Solution Overview
Problem
Existing ink jet recording methods face challenges with ink filterability, intermittent printing stability, and continuous printing stability due to the degradation of dispersion systems containing disperse dyes and water-soluble dyes, which are exacerbated by the inability to adjust dynamic surface tension effectively using dispersants.
Innovation Solution
A printing ink composition comprising a disperse dye, a first solvent with an IOB value between 1.0 and 4.0, a water-soluble dye with an IOB value exceeding 4.0, and a dispersant, where the solvent content exceeds 5.0 mass%, and optionally including a second solvent with an IOB value of 5.0 or more, to maintain dispersion stability and improve printing stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a disperse dye and water soluble dye are used together in ink jet recording, then color material dispersion stability is improved, but ink filterability and printing stability are degraded
Solution Approach 1:
The patent applies parameter changes by precisely controlling the IOB values of the disperse dye (1.5-3.0), water soluble dye (3.0-5.0), and first solvent (1.0-4.0) to satisfy specific mathematical relationships. This quantitative parameter optimization resolves the contradiction by finding the optimal balance point where dispersion stability is maintained while filterability and printing stability are improved.
Solution Approach 2:
The patent uses a composite ink composition containing disperse dye, water soluble dye, first solvent, and optionally second solvent in specific combinations. This composite approach allows the synergistic effects of different dye-solvent systems to achieve both dispersion stability and printing reliability simultaneously.
2Stability of the object's composition
If dispersant is added to maintain dispersion stability, then color material dispersion is improved, but dynamic surface tension adjustment capability is reduced
Solution Approach 1:
The patent changes the approach from relying on dispersant concentration to controlling the intrinsic IOB parameters of the dye-solvent system. By optimizing the IOB values and their relationships, the system achieves dispersion stability while maintaining the ability to adjust dynamic surface tension through solvent composition control.
Solution Approach 2:
The first solvent acts as an intermediary that mediates between the disperse dye and water soluble dye, facilitating compatible interactions. The solvent's IOB value serves as a bridge parameter that enables both dispersion stability and surface tension adjustability without requiring excessive dispersant.
Data Source
AI summary
A printing ink composition includes a disperse dye, a first solvent, a water soluble dye, and a dispersant, in which an IOB value A of the disperse dye, an IOB value B1 of the first solvent, and an IOB value C of the water soluble dye satisfy the following Equation (1), A<B1<C (1), the IOB value B1 is 1.0 to 4.0, and a content of the first solvent exceeds 5.0 mass%.