Liquid Composition pH Control for Inkjet Heating Resistor Protection
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Solution Overview
Problem
Existing liquid-liquid reaction systems using organic acids in inkjet recording methods face challenges in preventing the erosion of heating resistor protecting layers while maintaining high image quality, as strong bases like potassium hydroxide cause erosion and sulfonic acids with amino groups require high concentrations to prevent erosion effectively, leading to reduced organic acid content and solvent levels that compromise image quality.
Innovation Solution
A liquid composition containing an organic compound with a carboxy group and an amino group or an amine oxide compound is used, which controls pH and prevents erosion of the protecting layer, allowing for high optical density and uniformity by adjusting the carboxy group-containing organic acid content and pH within specific ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a strong base such as potassium hydroxide is used to adjust the pH of the liquid composition, then the pH control is effective, but the protecting layer of the heating resistor is eroded due to dissolution of metal and metal oxide
Solution Approach 1:
The patent changes the chemical parameters of the pH adjusting agent from strong inorganic bases to organic compounds with carboxy and amino groups (ampholytes) or amine oxide compounds. This parameter change allows effective pH control while preventing erosion of the heating resistor protecting layer, as these organic compounds do not dissolve metal and metal oxide in the protecting layer.
Solution Approach 2:
The organic compound with carboxy and amino groups acts as an intermediary substance that can adjust pH without directly attacking the protecting layer. The ampholytic nature of this compound allows it to function as a buffer system, controlling pH through its dual functional groups without the aggressive properties of strong bases.
2Reliability
If sulfonic acid containing an amino group (such as taurine) is added to prevent protecting layer erosion, then erosion is reduced, but image quality deteriorates due to reduced organic acid content and solvent levels
Solution Approach 1:
The patent changes the type of compound used for pH adjustment from sulfonic acids to organic compounds with carboxy and amino groups. This parameter change allows the liquid composition to maintain both protecting layer integrity and high image quality, as the carboxy group-containing organic acid can effectively aggregate coloring materials without compromising the protecting layer.
Solution Approach 2:
The liquid composition uses a composite approach by combining the organic compound with carboxy and amino groups (which provides both pH control and protecting layer protection) with carboxy group-containing organic acid (which provides coloring material aggregation). This composite formulation achieves both erosion prevention and high image quality simultaneously.
3Reliability
If high concentration of sulfonic acid with amino group is used to prevent erosion, then protecting layer integrity is maintained, but organic acid content and solvent levels must be reduced, leading to lower optical density and image uniformity
Solution Approach 1:
The patent changes the chemical composition parameters by replacing sulfonic acid with organic compounds containing carboxy and amino groups. This allows the liquid composition to maintain protecting layer integrity while preserving higher concentrations of organic acid and solvent, thereby achieving both erosion prevention and high optical density with good image uniformity.
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 effectively prevents protecting layer erosion while achieving high optical density and image uniformity, surpassing the limitations of previous methods using sulfonic acids or strong bases, ensuring the integrity of the heating resistor and image quality.
Implementation Method 1
The liquid composition contains at least either an organic compound having a carboxy group and an amino group or an amine oxide compound, an organic acid having a carboxy group, and water
Implementation Method 2
prevents the erosion of the protecting layer of the heating resistor
Implementation Method 3
ejected by the action of thermal energy from a recording head including a heating resistor
Implementation Method 4
a liquid composition containing an organic acid is brought into contact with an ink containing a coloring material that can aggregate under acid conditions
Data Source
AI summary
A liquid composition used in combination with an ink containing a coloring material is ejected by the action of thermal energy from a recording head including a heating resistor having a protecting layer that is to come into contact with the liquid composition and that contains at least one of a metal and a metal oxide. The liquid composition contains at least either an organic compound having a carboxy group and an amino group or an amine oxide compound, an organic acid having a carboxy group, and water.