Alcohol-Based Dry Erasable Ink Separating Agent Composition
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Solution Overview
Problem
Existing dry erasable inks for writing instruments face challenges in maintaining consistent erasability over time and across different whiteboard surfaces, as their performance varies with surface material and time since application, even when using known separating agents.
Innovation Solution
An alcohol-based dry erasable ink composition utilizing a specific mixture of pentaerythritol tetraester, fatty acid monoester, and fatty acid diester as the sole separating agents, which synergistically enhances erasability at the time of application and over time, regardless of the whiteboard surface material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If known separating agents (higher fatty acid esters, phthalic acid diesters, glycols, glycerin, aliphatic higher alcohols, liquid paraffin) are used in dry erasable inks, then the ink can be erased from whiteboard surfaces, but the erasability performance varies depending on the surface material (polypropylene, PVC, lacquered, enamel, melamine) and the time of erasing
Solution Approach 1:
The patent applies the composite materials principle by formulating a separating agent system that combines multiple ester components (pentaerythritol ester, fatty acid monoester, and fatty acid diester) in specific proportions. This composite separating agent system provides consistent erasability performance across different whiteboard surface materials (polypropylene, PVC, lacquered, enamel, melamine) and maintains reliability over time, resolving the contradiction between erasability consistency and surface material compatibility that plagues conventional single-agent or simple mixture systems
2Reliability
If conventional separating agent mixtures are used, then some erasability is achieved, but the synergistic enhancement of erasability at T0 (humid and dry) and overtime is not obtained
Solution Approach 1:
The patent applies parameter changes by precisely controlling the composition ratios of the separating agent components: pentaerythritol ester (0.1-25% by weight), fatty acid monoester (0.1-10% by weight), and fatty acid diester (0.1-10% by weight). This optimized parameter combination creates a synergistic effect that dramatically improves erasability performance both at T0 (immediate erasability in humid and dry states) and overtime (long-term erasability), while the specific ratio constraints prevent the composition from becoming overly complex
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 superior erasability properties both immediately after application and over extended periods, outperforming compositions using individual or other combinations of separating agents, ensuring effective removal without water or solvents on various whiteboard surfaces.
Implementation Method 1
when the ink composition is applied on the impervious writing surface followed by the evaporation of the solvent therefrom to form a writing or marking on the surface
Implementation Method 2
the separating agent forms a thin liquid or semisolid film on the surface while most of the colorant and the resin remain on the film. Therefore, the writing or marking is readily removed or erased from the surface by wiping or light mechanical abrasion
Data Source
AI summary
There is an alcohol-based dry erasable ink for writing instrument having as separating agent, more specifically as the only separating agent, a mixture of a pentaerythritol tetraester (a1), a fatty acid monoester (a2) and a fatty acid diester (a3). There also is a writing instrument having an alcohol-based dry erasable ink.