Ink Composition Dye Migration Control via IOB Parameter
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Solution Overview
Problem
W/O type emulsion inks used in writing instruments experience reduced emulsion dispersibility and shelf life when stored in containers, leading to compromised writing properties over time.
Innovation Solution
An ink composition with an aqueous component containing water, a thixotropic agent, a polyhydric alcohol, and a pigment, dispersed in an oil component with dyes and non-dye components, where the IOB value for all dyes is no greater than 0.9, ensuring stable dispersion and extended shelf life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If conventional W/O type emulsion inks are stored in storage containers, then the ink composition maintains initial emulsion stability, but the emulsion dispersibility deteriorates over time
Solution Approach 1:
The patent applies parameter changes by carefully controlling the IOB value of dyes in the oil component to be no greater than 0.9, and managing the difference between IOB values of dyes and non-dye components to be no greater than 0.3. These parameter adjustments prevent dye migration into the aqueous component during storage, maintaining emulsion dispersibility and extending shelf life without compromising writing properties
2Reliability
If dyes with high IOB values are used in the oil component, then the ink composition achieves good initial writing properties, but the dyes migrate into the aqueous component during storage, reducing emulsion stability
Solution Approach 1:
The patent resolves this contradiction by changing the parameter of IOB value for dyes to be no greater than 0.9, and the difference between dye and non-dye component IOB values to be no greater than 0.3. This parameter control prevents dye migration while maintaining writing properties, ensuring both reliability and stability are achieved simultaneously
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 maintains excellent dispersibility and writing properties for extended periods, even during storage, by controlling dye migration and enhancing the stability of the emulsion, resulting in superior shelf life and writing performance.
Implementation Method 1
an aqueous component containing water, a thixotropic agent, a polyhydric alcohol and a pigment
Data Source
Figure 1
AI summary
The ink composition for a writing instrument according to the invention has an aqueous component containing water, a thixotropic agent, a polyhydric alcohol and a pigment, dispersed in an oil component having dyes and non-dye components, wherein the IOB value for all of the dyes in the oil component is no greater than 0.9.