Aqueous Ink Jet Composition Stabilizing Color Material Dispersion
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Solution Overview
Problem
Aqueous ink jet ink compositions face challenges in maintaining a stable dispersion state of color materials due to the destabilizing effects of 1,2-alkanediols, which can lead to intermittent ejection defects and reduced image quality.
Innovation Solution
Incorporating 1-(2-hydroxyethyl)-2-pyrrolidone in a mass ratio of 1:10 to 10 with 1,2-alkanediol in the ink composition, which stabilizes the dispersion of color materials and improves permeability to recording media, thereby maintaining image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If 1,2-alkanediol is added to improve permeability and image quality, then permeability to recording media and image quality are improved, but dispersion state of color material becomes unstable
Solution Approach 1:
1-(2-hydroxyethyl)-2-pyrrolidone acts as an intermediary substance that mediates between 1,2-alkanediol and color material. It allows 1,2-alkanediol to maintain its permeability-enhancing function while the pyrrolidone molecule protects the color material dispersion from destabilization, effectively bridging the conflicting requirements
Solution Approach 2:
The ink composition uses a composite solvent system combining 1,2-alkanediol and 1-(2-hydroxyethyl)-2-pyrrolidone in specific mass ratios (1:10 to 10:1). This composite approach leverages the complementary properties of both substances: 1,2-alkanediol for permeability and image quality, and pyrrolidone for dispersion stability
2Productivity
If 1,2-alkanediol is used to increase drying rate, then drying rate is improved, but dispersion stability deteriorates
Solution Approach 1:
1-(2-hydroxyethyl)-2-pyrrolidone serves as a protective intermediary that enables the use of 1,2-alkanediol for rapid drying while preventing the color material from aggregating or precipitating during the drying process
Solution Approach 2:
The invention changes the chemical composition parameters of the ink vehicle by introducing 1-(2-hydroxyethyl)-2-pyrrolidone and optimizing its mass ratio with 1,2-alkanediol (1:10 to 10:1), thereby altering the physical-chemical environment to simultaneously achieve fast drying and stable dispersion
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 ensures good storage stability and image quality by mitigating the destabilizing influence of 1,2-alkanediols on color material dispersion, enhancing both dispersion stability and image quality.
Implementation Method 1
Incorporating 1-(2-hydroxyethyl)-2-pyrrolidone in a mass ratio of 1:10 to 10 with 1,2-alkanediol in the ink composition, which stabilizes the dispersion of color materials
Implementation Method 2
1,2-alkanediols are expected to improve the permeability of the ink composition to recording media
Implementation Method 3
discharging the above-described aqueous ink jet ink composition from a recording head to adhere the composition to a recording medium
Data Source
AI summary
An aqueous ink jet ink composition contains a color material, water, 1-(2-hydroxyethyl)-2-pyrrolidone, and a 1,2-alkanediol. The mass ratio of the content of the 1-(2-hydroxyethyl)-2-pyrrolidone and that of the 1,2-alkanediol is 1:10 to 10:1.