Oil-Based Ballpoint Pen Ink Viscosity and Leakage Control
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Solution Overview
Problem
Conventional oil-based ballpoint pen inks have high viscosity, leading to a heavy writing sensation and poor performance at low temperatures, with issues of ink leakage and line discontinuity due to variations in viscosity and the use of low molecular weight resins.
Innovation Solution
An ink composition with a viscosity of 300 to 3000 cps, comprising a polyvinylbutyral (PVB) resin, polyvinylpyrrolidone (PVP) resin, and a solvent mixture with a high boiling point primary solvent and low boiling point secondary solvent, which maintains stability and prevents ink leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If high molecular weight resin is used to reduce viscosity, then writing smoothness is improved, but ink leakage occurs during rapid writing
Solution Approach 1:
The patent uses a composite binder resin system combining high molecular weight resin (providing viscosity control and writing smoothness) with low molecular weight resin (providing ink leakage prevention). This composite approach allows the ink composition to achieve both low viscosity for smooth writing and adequate binding strength to prevent leakage during rapid writing.
2Ease of operation
If low molecular weight resin is used to reduce viscosity, then ink flow is improved, but line discontinuity occurs during rapid writing
Solution Approach 1:
The patent employs a composite binder resin system where low molecular weight resin components provide excellent ink flow and wetting properties, while high molecular weight resin components ensure line continuity and prevent breakage during rapid writing. The synergistic combination resolves the contradiction between improved ink flow and maintained line continuity.
3Ease of operation
If viscosity is reduced for smooth writing, then writing sensation is improved, but ink leakage occurs
Solution Approach 1:
The patent optimizes the molecular weight parameters of the binder resin components, specifically using high molecular weight resin with a weight average molecular weight of 50,000 or more. This parameter change allows the ink to achieve low viscosity for smooth writing sensation while the high molecular weight resin provides sufficient binding strength to prevent ink leakage.
4Reliability
If conventional high viscosity ink is used, then ink leakage is prevented, but writing sensation becomes heavy and smoothness is lost
Solution Approach 1:
The patent fundamentally changes the viscosity parameter of the ink composition by using high molecular weight binder resin components, achieving low viscosity (300-3000 cps) for smooth writing sensation. The specific selection of high molecular weight resin ensures that even at low viscosity, the ink maintains adequate binding properties to prevent leakage.
Data Source
AI summary
Disclosed are an ink composition for oil-based ballpoint pens which exhibits soft writing sensation due to low viscosity of 300 to 3000 cps, enables writing even at low temperatures and thus exhibits superior stability, and is free of leakage (of ink), and an oil-based ballpoint pen using the same.