Non-Aqueous Ink Composition Light Resistance
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Solution Overview
Problem
Non-aqueous ink compositions used in ink jet recording often exhibit poor ejection stability and light resistance, particularly when containing pigments with low light resistance, which can lead to reduced color balance and image quality on recording media.
Innovation Solution
A non-aqueous ink composition containing polyvinyl chloride and a specific solvent, represented by the formula R1-R2-R3, where R1 is an alkyl group with 1-8 carbon atoms and R2 and R3 are methyl or ethyl groups, enhancing the light resistance of pigments like C.I. Pigment Yellow 180 by interacting with polyvinyl chloride, thereby improving ejection stability and color balance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a non-aqueous ink composition contains pigment with low light resistance, then the ink can be used for recording on vinyl chloride-based resin, but the light resistance of the pigment is poor leading to reduced color balance
Solution Approach 1:
The patent introduces polyvinyl chloride as an intermediary substance that mediates between the pigment and the vinyl chloride-based resin. The polyvinyl chloride forms a protective interaction with the pigment, enhancing its light resistance while maintaining compatibility with the recording medium. This intermediary mechanism allows pigments with inherently low light resistance to achieve improved durability without sacrificing adaptability to the target substrate.
2Ease of manufacture
If specific solvents such as symmetric glycol diether or N-methylpyrrolidone are used to improve adhesiveness to vinyl chloride-based resin, then recording performance is enhanced, but thixotropic nature is reduced leading to poor ejection stability
Solution Approach 1:
The patent modifies the chemical parameters of the solvent system by selecting specific organic solvents with particular molecular structures and properties. By carefully choosing solvents that maintain appropriate viscosity and thixotropic characteristics, the formulation achieves both good ejection stability from the inkjet head and adequate adhesiveness to the vinyl chloride-based resin substrate, resolving the contradiction between these two performance requirements.
3Adaptability or versatility
If conventional non-aqueous ink composition is used, then recording on various media is enabled, but ejection stability during high frequency ink droplet formation is poor
Solution Approach 1:
The patent optimizes the physical and chemical parameters of the ink composition, particularly focusing on viscosity, surface tension, and thixotropic properties. By adjusting these parameters within specific ranges, the ink maintains stable ejection characteristics during high-frequency droplet formation while retaining the ability to record on various media types including vinyl chloride-based resin.
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 stable ink ejection and enhanced light resistance of pigments, preventing color balance reduction and firmly fixing images on vinyl chloride-based recording media, even under prolonged exposure to light.
Implementation Method 1
a specific solvent which enables polyvinyl chloride to be dissolved
Implementation Method 2
the light resistance of the pigment can be enhanced as a result of the interaction of the pigment with polyvinyl chloride which is dissolved in the solvent
Implementation Method 3
it is known that the thixotropic nature is caused by the structural change of association due to hydrogen bond of a polar solvent to a dispersed material or is caused by the change of the conformation of resin
Data Source
AI summary
An ink jet recording-targeted non-aqueous ink composition contains pigment, polyvinyl chloride, and a solvent represented by the formula 1,wherein R1 represents an alkyl group having one to eight carbon atoms, and R2 and R3 each represent any one of a methyl group and an ethyl group.