Composite Colored Particles for Water-Based Ink Durability
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Solution Overview
Problem
Water-based ink compositions for writing instruments often result in blurry markings on fibrous materials and are prone to erasure when rubbed, lacking sufficient anti-blurring and scratch resistance.
Innovation Solution
A water-based ink composition featuring composite colored particles formed by combining cationic resin particles with negative electric charges and anionic dye-containing particles through Coulomb forces, which are then dispersed in a water-based medium, enhancing the ink's writing performance and resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If water-based ink composition is used, then writing with little pressure is achieved, but anti-blurring performance and scratch resistance are inferior
Solution Approach 1:
The patent uses composite colored particles consisting of a resin particle core coated with a dye-containing shell. This composite structure combines the advantages of both components: the resin particle provides structural integrity and resistance to blurring and scratching, while the dye-containing shell provides coloration. The composite material allows water-based ink to achieve both ease of writing and durability.
Solution Approach 2:
The dye-containing shell acts as a thin film coating on the resin particle core. This shell structure allows the ink to maintain good flow properties for easy writing while the coated surface provides resistance to blurring and scratching. The thin film structure is crucial for maintaining the water-based ink's流动性 while adding protective properties.
2Ease of operation
If water-based ink composition is used, then writing with little pressure is achieved, but scratch resistance is inferior
Solution Approach 1:
The composite colored particles combine a resin particle (providing structural strength and scratch resistance) with a dye-containing coating (providing color). This composite structure enables the ink to resist scratching while maintaining the low-pressure writing characteristic of water-based inks.
Solution Approach 2:
The dye-containing shell acts as a protective thin film on the resin particle, providing scratch resistance while allowing the underlying resin structure to maintain the ink's flow properties for easy writing.
3Quantity of substance
If conventional dye particles are used, then coloration is achieved, but markings become blurry on fibrous materials
Solution Approach 1:
The composite colored particles combine a resin particle core with a dye-containing shell. The resin core acts as a carrier that prevents the dye from soaking into fibrous materials, while the dye-containing shell provides the necessary coloration. This structure maintains marking clarity on various surfaces including fibrous materials.
Solution Approach 2:
The resin particle acts as an intermediary between the dye and the substrate. It carries the dye-containing shell and prevents direct contact between the dye and fibrous materials, thereby preventing blurring while still allowing coloration to occur.
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 exhibits excellent anti-blurring and scratch resistance, maintaining clear and durable markings on various surfaces, including paper and cloth, while being suitable for industrial production.
Implementation Method 1
a resin particle carrying a positive electric charge on a particle surface and a dye-containing particle carrying a negative electric charge on a particle surface, the resin particle and the dye-containing particle forming a composite through the Coulomb force
Data Source
AI summary
Composite colored particles may include resin particles carrying a positive electric charge on particle surfaces and dye-containing particles carrying a negative electric charge on particle surfaces, the resin particles and the dye-containing particles forming a composite through Coulomb force. A water-based ink composition may include such composite colored particles dispersed in a water-based medium. A writing instrument may contain the water-based ink composition. A method of producing such composite colored particles may include forming a composite by mixing a resin emulsion containing resin particles carrying a positive electric charge on particle surfaces and a colored resin dispersion containing dye-containing particles carrying a negative electric charge on particle surfaces.