Ink Composition Thickening with Low Molecular Weight Glycol
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Solution Overview
Problem
Conventional ink compositions for writing instruments face issues with reduced fluidity and increased likelihood of line splitting when high amounts of thickener are used, while reducing thickener amounts leads to scratching and poor writing feel.
Innovation Solution
An ink composition combining polyethylene glycol or polypropylene glycol with a molecular weight between 200 and 1000 and an acrylic resin having an amine, which provides high fluidity and desired thickening effect without causing scratching, by linking aggregates to enhance viscosity and shear-thinning properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the amount of thickener is increased to obtain a predetermined thickening effect, then the thickening effect is improved, but fluidity is reduced and the likelihood of line splitting increases
Solution Approach 1:
The patent changes the molecular weight parameter of the thickener from conventional high molecular weight polysaccharides to low molecular weight polyethylene glycol or polypropylene glycol (200-1000), which fundamentally alters the thickening mechanism and allows for better fluidity while maintaining thickening effect
Solution Approach 2:
The patent creates a composite thickening system by combining polyethylene glycol or polypropylene glycol with acrylic resin having an amine group, where the synergistic interaction between these components provides both the desired thickening effect and maintained fluidity
2Ease of operation
If the amount of thickener is reduced to improve fluidity, then fluidity is improved, but scratching occurs and writing feel deteriorates
Solution Approach 1:
By changing to low molecular weight glycols (200-1000), the patent achieves effective thickening at lower concentrations, preventing scratching while maintaining fluidity and good writing feel
Solution Approach 2:
The patent discards the conventional thickener system (polysaccharides) that causes scratching when reduced, and recovers the thickening function through the new glycol-acrylic resin combination that provides scratching-free performance even at lower amounts
3Object-affected harmful factors
If the amount of thickener is increased to prevent scratching, then scratching is prevented, but line stability deteriorates
Solution Approach 1:
The composite system of polyethylene glycol/polypropylene glycol with acrylic resin provides synergistic effects where the acrylic resin component specifically addresses line stability while the glycol component prevents scratching, achieving both goals 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 achieves excellent writing feel and line quality with controlled viscosity, preventing scratching and line splitting, while maintaining the desired thickening effect.
Implementation Method 1
provides high fluidity and desired thickening effect without causing scratching, by linking aggregates to enhance viscosity and shear-thinning properties
Data Source
AI summary
Embodiments of the present disclosure provides an ink composition for a writing instrument comprising a colorant and water, wherein the ink composition further comprises a thickener including polyethylene glycol or polypropylene glycol having a molecular weight between 200 and 1000 and an acrylic resin having an amine.