Water-Based Pen Ink With Resin Particles for Uniform Lines
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Solution Overview
Problem
Conventional water-based ink compositions for writing instruments face issues with ink bleeding, density differences in drawn lines, and insufficient non-dryness, particularly when the pen tip is left open for extended periods.
Innovation Solution
A water-based ink composition comprising resin particles and pentaerythritol, with specific ratios of resin particles and optional additives like glycine betaine, trimethylolpropane, and trimethylolethane, to form a coating film and enhance non-dryness while suppressing bleeding and density differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If water-based ink composition contains conventional solvents and additives, then the ink can be applied smoothly, but ink bleeding and density differences occur during writing
Solution Approach 1:
The patent changes the chemical parameters of the ink composition by incorporating resin particles (0.1-10% by mass) and specific humectants (polyethylene glycol 200-1000, propylene glycol monomethyl ether, or 1,3-propanediol) in controlled amounts. This parameter adjustment resolves the contradiction by maintaining writing smoothness while eliminating ink bleeding and density differences through optimized composition ratios.
Solution Approach 2:
The patent uses a composite material system combining resin particles with specific humectants and colorants in water-based formulation. This composite approach allows the ink to maintain smooth application properties while the resin particles provide structural integrity to prevent bleeding and ensure uniform line density.
2Duration of action of stationary object
If water-based ink composition is formulated for good non-dryness, then the ink remains wet longer, but ink sagging occurs when pen tip is left open
Solution Approach 1:
The patent optimizes the parameter of humectant concentration (0.1-10% by mass of specific humectants) to achieve the desired balance. The resin particles (0.1-10% by mass) work synergistically with the humectants to maintain non-dryness duration while preventing ink sagging through controlled viscosity and surface tension properties.
3Reliability
If resin particles are added to improve color formability and bleeding resistance, then bleeding is suppressed, but the ink composition becomes more complex
Solution Approach 1:
The patent maintains relatively simple ink composition by controlling resin particle content at 0.1-10% by mass and selecting from a limited range of humectants. This parameter control achieves bleeding resistance without excessive complexity in the formulation.
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 composition effectively prevents ink bleeding, maintains consistent line density, and ensures favorable non-dryness, even after prolonged pen tip exposure.
Implementation Method 1
resin particles and pentaerythritol... to form a coating film
Implementation Method 2
water-based ink composition comprising resin particles and pentaerythritol
Data Source
AI summary
The water-based ink composition for a writing instrument of the present invention contains resin particles and pentaerythritol, in which the content of the resin particles is 0.1% by mass or more, based on the mass of the water-based ink composition for a writing instrument.