Neutral ink and ball-point pen containing same

Abstract

The invention provides neutral ink and a ball-point pen containing the same. The neutral ink comprises, by weight, 6.0-10.0 parts of pigments, 1.5-3.0 parts of polymeric dispersants, 0.2-1.0 part of thickening materials, 0.01-0.1 part of lubricants, 5.0-10.0 parts of cosolvents, 10.0-20.0 parts of humectants, 0.1-0.3 part of sterilizing agents, 0.5-2.0 parts of pH (potential of hydrogen) regulators and 53.6-76.7 parts of deionized water. The neutral ink adopts specific thickening materials, has shear thinning and tensile hardening viscosity properties and is good in leak resistance and excellent in low-temperature writing property.

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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