Ink-jet Ink Composition for Pressure-Adhesion Recording
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Solution Overview
Problem
Existing ink-jet ink compositions for pressure-adhesion recording target media lack a balance of excellent transfer resistance, color developing properties, and intermittent printing capability.
Innovation Solution
An ink-jet ink composition containing a pigment, resin, organic solvent, surfactant, and water, with specific mass ratios and types, including a styrene-acrylic resin or urethane-based resin with a glass transition temperature of 36° C. or lower, and an anionic self-dispersive pigment, along with an alkanediol and propylene glycol as solvents, and an acetylene-based surfactant, to achieve balanced performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the pigment content is increased to improve color developing properties, then the color saturation and image quality improve, but the viscosity of the ink increases and ejection stability deteriorates
Solution Approach 1:
The patent optimizes the pigment content parameter to be 5.7% by mass or more but not exceeding a specific upper limit, and adjusts the resin-to-pigment ratio parameter to maintain ejection stability. By carefully controlling these compositional parameters, the patent achieves both excellent color developing properties and stable ink ejection performance.
2Strength
If the resin content is increased to improve transfer resistance in peeling, then the adhesion and image quality improve, but the total content of pigment and resin increases which affects ejection stability
Solution Approach 1:
The patent specifies that the resin content should be 0.7 to 7.0% by mass, and the total content of pigment and resin should be 10.3% by mass or less. By optimizing these parameter ranges and the resin-to-pigment ratio, the patent achieves excellent transfer resistance while maintaining ejection stability.
Solution Approach 2:
The patent uses a composite resin system comprising styrene-acrylic resin and urethane-based resin in specific proportions. This composite material approach allows the resin to provide both adhesion (transfer resistance) and compatibility with the pigment for stable ejection, resolving the contradiction between strength and reliability.
3Productivity
If the organic solvent content is increased to improve intermittent printing capability, then the ink flow and ejection stability improve, but the color saturation and image quality may be compromised
Solution Approach 1:
The patent optimizes the organic solvent content parameter to be 5% by mass or more and 20% by mass or less, and adjusts the resin-to-pigment ratio accordingly. By controlling these parameters, the patent achieves both excellent intermittent printing capability and color developing properties.
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 composition achieves excellent transfer resistance, color developing properties, and intermittent printing capability by optimizing the resin content, glass transition temperature, and solvent composition, ensuring stable ink ejection and effective image formation.
Implementation Method 1
the resin contains a styrene-acrylic resin having a glass transition temperature of 36° C. or lower, and the content of the styrene-acrylic resin is 70 parts by mass or more with respect to 100 parts by mass of the pigment
Data Source
AI summary
Provided is an ink-jet ink composition for a pressure-adhesion recording target medium. The ink-jet ink composition contains a pigment, a resin, an organic solvent, a surfactant, and water.