Inkjet Ink Set Using Dual Binder Resins for Stable Adhesion
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Solution Overview
Problem
Inkjet inks with binder resin particles suffer from insufficient ejection stability and struggle to achieve sufficient rubfastness and adhesion to non-absorbent recording media, such as flexible packaging, when used in inkjet printing.
Innovation Solution
An inkjet ink set comprising a first ink with polyolefin resin binder particles and a second ink with urethane resin binder particles, each with specific breaking elongation ranges, is used to enhance ejection stability and adhesion to non-absorbent recording media.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If binder resin particles are added to inkjet ink to improve rubfastness and adhesion, then image quality improves, but ejection stability deteriorates
Solution Approach 1:
The patent applies parameter changes by precisely controlling the breaking elongation of binder resin particles within specific ranges (60-750% for first binder resin, ≤60% for second binder resin) and adjusting particle size distributions. This optimization resolves the contradiction by finding the optimal parameter range where particles provide sufficient adhesion while maintaining ejection stability through appropriate mechanical properties.
Solution Approach 2:
The patent uses composite materials by combining multiple types of binder resin particles with different breaking elongation characteristics and material compositions. The first binder resin (60-750% breaking elongation) and second binder resin (≤60% breaking elongation) work synergistically to provide both ejection stability and excellent rubfastness/adhesion, resolving the trade-off between these opposing requirements.
2Strength
If binder resin particles with high breaking elongation are used to improve adhesion, then rubfastness improves, but ejection stability worsens
Solution Approach 1:
The patent applies parameter changes by establishing a specific breaking elongation range (60-750%) for the first binder resin that optimizes the balance between adhesion and ejection stability. This parameter optimization ensures particles adhere sufficiently to the substrate while maintaining proper flow characteristics during inkjet ejection.
Solution Approach 2:
The patent segments the binder resin function into two distinct components: first binder resin particles (60-750% breaking elongation) for adhesion and ejection stability, and second binder resin particles (≤60% breaking elongation) for enhanced rubfastness. This segmentation allows each component to specialize in specific functions, resolving the contradiction between adhesion and ejection stability.
3Duration of action of stationary object
If binder resin particles are added to achieve sufficient rubfastness, then image durability improves, but ink ejection stability deteriorates
Solution Approach 1:
The patent uses composite materials by formulating ink with multiple binder resin types having different breaking elongation properties. The combination of first binder resin (60-750%) and second binder resin (≤60%) creates a synergistic effect where the mixture provides both ejection stability and superior rubfastness, resolving the contradiction between these properties.
Solution Approach 2:
The patent applies parameter changes by controlling the breaking elongation of binder resin particles within specific ranges and adjusting particle size distributions. This parameter optimization ensures that the ink maintains ejection stability while the binder particles provide sufficient durability and rubfastness to the printed image.
Data Source
AI summary
An inkjet ink set includes: a first ink; and a second ink. The first ink includes a first pigment, a first binder resin particle, and a first aqueous medium. The second ink includes a second pigment, a second binder resin particle, and a second aqueous medium. The first binder resin particle includes a polyolefin resin. A breaking elongation of the first binder resin particle at 25° C. is greater than 60% and 750% or less. The second binder resin particle includes a urethane resin. A breaking elongation of the second binder resin particle at 25° C. is 60% or less.