Ink Composition Surfactant Blend for Media Adaptability
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Solution Overview
Problem
Conventional ink jet recording compositions face challenges in achieving high-quality image recording and fixability on various types of recording media with different absorbability, leading to issues like ink penetration variability, aggregation, and color irregularity.
Innovation Solution
An ink composition containing three or more kinds of acetylene glycol-based surfactants with specific structures and HLB values, which improves wettability and permeability, allowing for high-speed image recording on diverse media by maintaining a balanced surfactant ratio and concentration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional ink composition containing a single surfactant type is used, then the ink composition shows good performance on one type of recording medium, but the image quality deteriorates on recording media with different absorbability
Solution Approach 1:
The patent combines three or more different surfactants (acetylene glycol-based surfactant, fluorine-based surfactant, and silicone-based surfactant) in specific ratios to create a composite surfactant system. This composite approach allows the ink composition to adapt to various recording media surfaces by providing multiple interaction mechanisms, thereby maintaining good image quality across different media types including both high and low absorbability papers
Solution Approach 2:
The patent applies different surfactant components to address different local characteristics of recording media surfaces. The acetylene glycol-based surfactant targets hydrophilic regions, while the fluorine-based and silicone-based surfactants address hydrophobic regions and low-energy surfaces respectively, ensuring uniform ink behavior across the entire media surface regardless of local variations
2Productivity
If the ink composition has high permeability to penetrate into the recording medium quickly, then the recording speed increases, but the ink penetration speed becomes insufficient on recording media with low absorbability
Solution Approach 1:
The patent modifies the surface tension and wettability parameters of the ink composition by carefully selecting and ratioing multiple surfactants with different HLB values and surface activities. This allows the ink to achieve optimal penetration speed on high absorbability media while maintaining sufficient wetting on low absorbability media, effectively resolving the speed contradiction across different media types
Solution Approach 2:
The patent creates a dynamic surfactant system where the different surfactant components respond differently to various media surfaces. On high absorbability media, the more hydrophilic surfactants dominate to enable rapid penetration, while on low absorbability media, the fluorine-based and silicone-based surfactants become more active to provide adequate wetting and spreading, allowing the system to adapt its penetration characteristics in real-time based on media properties
3Reliability
If the ink composition uses a surfactant that improves wetting and spreading properties, then the permeability increases, but aggregation of ink droplets and color irregularity occur on recycled paper
Solution Approach 1:
The patent introduces fluorine-based and silicone-based surfactants as intermediary agents that mediate between the ink composition and the complex surface of recycled paper. These intermediary surfactants reduce surface tension and improve wetting without causing the aggregation issues that single surfactant systems exhibit on heterogeneous surfaces, thereby maintaining image quality while preventing harmful effects
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 composition ensures excellent image quality and fixability at high speeds on both high and low absorbability recording media, reducing aggregation and color irregularity, and minimizing the need for additional drying steps.
Implementation Method 1
the surfactant can improve an image quality of a recorded image... excellent in a function of improving the permeability and the wetting and spreading properties of the ink composition with respect to a recording medium
Implementation Method 2
improve the permeability... of the ink composition with respect to a recording medium... penetration speed of an ink is different depending on the position
Data Source
AI summary
An ink composition for ink jet recording according to the invention contains water, a coloring material, and three or more kinds of acetylene glycol-based surfactant selected from acetylene glycol represented by the following general formula (1) and an ethylene oxide adduct of acetylene glycol represented by the following general formula (2), and a total content of the acetylene glycol-based surfactant is 0.1% by mass to 3% by mass with respect to the total mass of the ink composition. (In the general formula (1), each of R1 and R2 independently represents an alkyl group having 1 to 5 carbon atoms.) (In the general formula (2), each of R3 and R4 independently represents an alkyl group having 1 to 5 carbon atoms, each of m and n independently represents a positive number of 0.5 to 25, and m + n is 1 to 40.)