Ink Composition Solubility Parameter Curling Suppression
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Solution Overview
Problem
Existing inkjet ink compositions face issues with curling of prints and deterioration of liquid-repellency in inkjet head members, particularly when using low-polarity solvents, which affect ink ejection reliability and head maintenance.
Innovation Solution
An inkjet ink composition comprising at least one water-soluble organic solvent with a solubility parameter of 27.5 or less, colloidal silica, and a pH value between 7.5 and 10, along with a combination of solvents and resin-coated pigments, to enhance ejection reliability and prevent curling and head deterioration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If low-polarity solvents are used in aqueous ink to suppress curling, then curling suppression is improved, but liquid-repellency of inkjet head members deteriorates
Solution Approach 1:
The patent applies parameter changes by carefully controlling the solubility parameter of water-soluble organic solvents (20-30, preferably 22-28) and their content ratio (3-20%, preferably 5-15%). This optimization balances the curling suppression effect while minimizing deterioration of liquid-repellency, resolving the technical contradiction through precise parameter tuning rather than extreme values.
Solution Approach 2:
The patent uses a composite ink composition combining multiple water-soluble organic solvents with different solubility parameters, along with colloidal silica (0.01-0.5%) and specific surfactants. This composite approach allows the ink to achieve both curling suppression and maintain liquid-repellency through synergistic interactions between components.
2Manufacturing precision
If colloidal silica is added to improve image quality, then image formation is improved, but ink ejection reliability may deteriorate
Solution Approach 1:
The patent applies parameter changes by precisely controlling the content of colloidal silica within 0.01-0.5% by mass and adjusting the solubility parameter of organic solvents to 20-30. This optimization ensures that colloidal silica particles remain properly dispersed and do not aggregate, maintaining ink ejection reliability while achieving the desired image quality improvement.
3Object-affected harmful factors
If high content of water-soluble organic solvent is used to suppress curling, then curling suppression is improved, but ink composition stability deteriorates
Solution Approach 1:
The patent applies parameter changes by optimizing the solubility parameter range (20-30) and content ratio (3-20%) of water-soluble organic solvents. This controlled approach provides sufficient curling suppression while maintaining ink composition stability through proper balance of hydrophilic and hydrophobic components.
Solution Approach 2:
The patent uses a composite formulation combining multiple water-soluble organic solvents with colloidal silica and surfactants. This composite structure enhances overall ink stability while maintaining effective curling suppression through the synergistic effects of different components working together.
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 ink discharge reliability, suppresses curling of prints, and maintains the liquid-repellency of inkjet head members, improving overall printing performance and head longevity.
Implementation Method 1
an inkjet ink composition comprising at least one first water-soluble organic solvent, water, at least one colorant, and 0.005 to 0.5% by mass, based on the total amount of the inkjet ink composition, of colloidal silica
Implementation Method 2
40% or more by mass of a total content of the water-soluble organic solvent has an SP value of 27.5 or less
Data Source
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AI summary
The present invention provides an inkjet ink composition including at least one water-soluble organic solvent, water, at least one colorant, and at least one colloidal silica, wherein 40% or more by mass of a total content of the water-soluble organic solvent has an SP value of 27.5 or less, and the inkjet ink composition having excellent discharge reliability, and suppressing curling of prints formed with the ink and deterioration of liquid repellency of an inkjet head member.