Ink Set Aggregate Formation for Scratch Resistance
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Solution Overview
Problem
Existing ink jet recording methods face challenges in achieving high scratch resistance and image quality, particularly on plain paper, due to issues with paper deformation, dot diameter, and image glossiness, especially when increasing recording speed.
Innovation Solution
An ink set comprising a pigment, polymer particles, a water-soluble organic solvent, a lubricant, and a reaction liquid that forms an aggregate, which stabilizes the ink composition and enhances scratch resistance during high-speed ink jet recording.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If ink jet recording speed is increased, then productivity is improved, but image quality and scratch resistance deteriorate
Solution Approach 1:
The patent uses a composite ink composition containing pigment particles, polymer particles, and lubricant in specific combinations. The polymer particles (0.01-10 μm) and lubricant (0.01-5 μm) work together to form a protective matrix that maintains image quality and scratch resistance even at high recording speeds, resolving the contradiction between productivity and manufacturing precision.
2Ease of manufacture
If ink composition is simplified, then ease of manufacture is improved, but scratch resistance deteriorates
Solution Approach 1:
The patent specifies precise parameter ranges for pigment particle diameter (0.1-10 μm), polymer particle diameter (0.01-10 μm), and lubricant content (0.1-10 wt%). By controlling these parameters within optimal ranges, the ink achieves both ease of manufacture and high scratch resistance, as the defined composition ensures proper aggregate formation and film properties.
Solution Approach 2:
The ink composition comprises multiple components (pigment, polymer, lubricant) in specific ratios that work synergistically. This composite structure provides scratch resistance while maintaining manufacturability, as each component serves a specific function and the overall composition is designed for practical production.
3Quantity of substance
If dot diameter is increased, then image density is improved, but resolution deteriorates
Solution Approach 1:
The patent employs lubricant particles (0.01-5 μm) that localize at the boundaries of ink droplets, creating a protective rim that prevents dot gain and maintains sharp edges. This local concentration of lubricant allows sufficient ink density within the dot while preserving resolution at the dot boundaries, resolving the contradiction between image density and resolution.
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 ink set effectively suppresses paper deformation and achieves high scratch resistance while maintaining image quality, even at increased recording speeds, by forming aggregates with the ink composition and reaction liquid, resulting in improved image density and resolution.
Implementation Method 1
a reaction liquid that forms an aggregate by contacting with the ink composition
Data Source
AI summary
An ink set for ink jet recording containing an ink composition containing a pigment, polymer particles, a water-soluble organic solvent, a lubricant, and water and a reaction liquid that forms an aggregate by contacting with the ink composition and an ink jet recording method using the same are provided.