Gel ink and ballpoint pens containing it

Abstract

The invention provides a neutral ink and a ballpoint pen containing the neutral ink. The neutral ink is composed of the following components in parts by weight: 6.0-10.0 parts by weight of pigment; 1.5-3.0 parts by weight of polymer dispersant; thickener 0.2-1.0 parts by weight; 0.01-0.1 parts by weight of lubricant; 5.0-10.0 parts by weight of co-solvent; 10.0-20.0 parts by weight of humectant; 0.1-0.3 parts by weight of fungicide; 0.5-2.0 parts by weight of pH regulator; 53.6-76.7 parts by weight of water. The neutral ink of the invention adopts a specific thickener, so that the ink has the viscosity characteristics of shear thinning and stretch hardening, and has good leakage resistance and low-temperature writing performance.

Description

technical field [0001] The invention relates to the field of writing instruments, in particular to a neutral ink and a ballpoint pen containing the neutral ink. Background technique [0002] The ballpoint pen is a writing tool that is commonly used at present. The evaluation of the writing performance of the ballpoint pen involves many items. One of the important tests is the performance test of dripping ink, which simulates the state that the consumer temporarily stops writing and keeps the pen head down during the writing process. (For the push-type ballpoint pen, the tip of the pen is always in a downward state). At this time, it is required that the tip of the pen should not have ink dripping or serious accumulation of ink, that is, ink leakage. The oil-based ink used in oil-based ballpoint pens has a relatively high apparent viscosity, usually above 10Pa·s, and the fluidity of the ink is poor, so generally no ink will flow out from the mouth of the pen head in a static ...

AI Technical Summary

Problems solved by technology

The usual way to improve ink leakage resistance is to increase the apparent viscosity, but the increase in apparent viscosity will inevitably damage the fluency of ink output

In addition, the lower the temperature, the higher the viscosity of the ink, and the increase in the apparent viscosity at room temperature will lead to a greater increase in the apparent viscosity at low temperature, which in turn will damage the writing performance of the gel pen in the low temperature environment

[0006] To sum up, there is still no good solution to the ink leakage problem of gel pens, especially in terms of ink, there is a lack of a gel ink with good leakage resistance and no damage to other writing properties

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