Water-Based Ink Set Cationic Polymer Diffusion Control
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Solution Overview
Problem
Conventional water-based ink sets for ink-jet recording face challenges in maintaining color stability and durability against light, heat, and ozone, especially in high humidity environments, where certain dyes cause diffusion issues leading to color changes and 'migration' phenomena, limiting the selection of inks with varying migration levels.
Innovation Solution
A water-based ink set comprising two or more inks, one containing a specific dye represented by a general formula and another with a cationic polymer, where the cationic polymer is either blended separately or together with the dye inks, and overprinted in specific conditions to minimize color change and migration on recording media.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional dyes are used in water-based ink sets, then satisfactory hue and durability against light, heat, and ozone are achieved, but diffusion control becomes difficult in high humidity environments causing color changes
Solution Approach 1:
A cationic polymer is introduced as an intermediary substance between the dye and the recording medium. The polymer interacts with both the dye molecules and the paper surface, controlling the diffusion behavior of the dye in high humidity environments while maintaining the dye's inherent durability properties. This mediator approach allows the system to achieve both color stability and durability simultaneously.
Solution Approach 2:
The ink composition is formulated as a composite system combining conventional dyes with cationic polymers. This composite approach leverages the strengths of both components: the dye provides satisfactory hue and durability against light, heat, and ozone, while the cationic polymer provides diffusion control in high humidity conditions, resulting in a synergistic effect that resolves the technical contradiction.
2Stability of the object's composition
If water-based inks with different migration levels are selected to suppress color change, then color stability is improved, but the range of ink selection becomes narrow
Solution Approach 1:
The invention changes the fundamental parameter of diffusion control from being dependent on ink formulation alone to being controlled by the interaction between the cationic polymer and the recording medium. This parameter change allows inks with different base formulations to achieve similar color stability when used with the polymer-containing system, thereby expanding the range of selectable inks while maintaining color stability.
3Manufacturing precision
If the maximum difference among mutual migration levels is decreased in multiple water-based inks, then color change due to migration is suppressed, but the selection flexibility of ink combinations is reduced
Solution Approach 1:
The cationic polymer serves as a universal intermediary that standardizes the diffusion behavior of different dyes on the recording medium. By introducing this common mediator, the system achieves consistent color change control across diverse ink combinations without requiring precise matching of migration levels, thus maintaining both control precision and selection flexibility.
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 solution effectively suppresses color changes and migration in high humidity environments, ensuring stable and durable inkjet recordings by controlling the interaction between the cationic polymer and dye on glossy paper, maintaining satisfactory hue and optical density.
Implementation Method 1
the humidity affects the easiness of diffusion of the specified dye into the recording medium
Data Source
AI summary
A water-based ink set for ink-jet recording, includes two or more water-based inks each of which contains a colorant, water, and a water-soluble organic solvent; wherein at least one ink among the two or more water-based inks contains a dye represented by a general formula (1) , and at least one ink among the two or more water-based inks contains a cationic polymer: