Aqueous Writing Ink Composition for Durable Low-Viscosity Marking
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Solution Overview
Problem
Existing aqueous ink compositions for writing utensils face challenges in achieving a high degree of compatibility between durability and writing performance after long-term storage, while also considering environmental impact, as increasing resin content for durability leads to increased viscosity and environmental concerns.
Innovation Solution
Incorporating water-insoluble cellulose and an evaporation inhibitor into the ink composition, with a vapor pressure of less than 12.3 kPa, and using an acetylene-based surfactant to maintain low viscosity and improve writing performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the blending amount of fixing resin is increased to improve durability, then the durability (water resistance, alcohol resistance) is improved, but the liquid viscosity is increased which restricts ink design
Solution Approach 1:
The invention extracts and removes the fixing resin component from the ink composition entirely, replacing it with water-insoluble cellulose particles that provide durability without increasing viscosity. This extraction of the problematic substance while maintaining the desired function directly resolves the contradiction between durability and viscosity.
2Reliability
If blending compositions using resin with low solubility parameter and non-polar solvent is performed to enhance durability further, then the durability is improved, but the environmental load increases making it unfavorable
Solution Approach 1:
The invention changes the fundamental parameters of the ink composition by switching from organic solvents and resins to an aqueous system with water-insoluble cellulose. This parameter change eliminates the need for non-polar solvents and low solubility parameter resins, thereby reducing environmental load while maintaining durability through the unique properties of water-insoluble cellulose particles.
3Manufacturing precision
If cellulose nanofibers and biomass nanofibers are used to improve drawing quality and storage stability, then the drawing quality and storage stability are improved, but adverse effects on weather resistance, viscosity change after long-term storage, and writing performance occur
Solution Approach 1:
The invention uses water-insoluble cellulose particles that remain stable and do not degrade over time, unlike nanofibers that can cause viscosity changes and performance degradation during storage. The water-insoluble cellulose provides consistent weather resistance and writing performance throughout the product lifecycle without the adverse effects of nanofiber degradation.
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 achieves excellent durability and writing performance, including water and alcohol resistance, with reduced environmental burden, by using water-insoluble cellulose and an evaporation inhibitor, and an acetylene-based surfactant to maintain ink fluidity and prevent blurring.
Implementation Method 1
containing at least a water-insoluble cellulose
Implementation Method 2
having a vapor pressure of ink at 50°C of less than 12.3 kPa
Implementation Method 3
the aqueous ink composition for a writing utensil further contains an acetylene-based surfactant
Data Source
Figure 1(a)~1(c)
Figure 2(a)~2(d)
Figure 3(a)~3(b)
AI summary
Provided are an aqueous ink composition for a writing utensil and a writing utensil using the same suitable for a marking pen, a marker pen, and the like, which can highly achieve and maintain compatibility in both durability (water resistance, polyalcohol) and good writing performance even after long-term storage without using a fixing resin and is also excellent to the recent environmental action (less environmental burden). The aqueous ink composition for a writing utensil of the present invention contains at least a water-insoluble cellulose and an evaporation inhibitor, in which a vapor pressure of ink at 50°C is less than 12.3 kPa. A writing utensil of the present invention is characterized by being loaded with the aqueous ink composition for a writing utensil having the configuration described above.