Erasable neutral ink composition

Abstract

The invention discloses an erasable neutral ink composition which comprises water-soluble polyacrylamide, a pigment, low-polymerization-degree polyethyleneglycol, a thickener, polyether-modified silicon oil, a humectant, water-soluble phosphate, a pH regulator, a polyquaternary ammonium salt antimicrobial agent, a water-soluble dispersing agent, a viscosity modifier and deionized water. Abundant raw material screening and formula trial production are performed to obtain a neutral ink with favorable erasing effect. The ink has excellent erasability, stability and writing properties, can satisfy the requirement of the user for easily erasing the clerical errors and protect the neatness and beautiful appearance of documents, and solves the problems of granule formation, low tendency to uniform dispersion and high tendency to settling in the ink in the prior art.

Description

technical field [0001] The present invention relates to a kind of neutral ink composition, specifically, the present invention relates to a kind of erasable neutral ink composition. Background technique [0002] Neutral ink is widely used for permanent document preservation because of its smooth and smooth writing feel, no ink bleeding or ink leakage; writing resistance to light, water, temperature and chemical stability (acid resistance, alkali resistance, strong oxidant resistance, bleaching agent, etc.). Be accepted by people. However, it is inevitable that mistakes will occur when writing, and correction fluid must be used for writing. However, it is inconvenient to use correction fluid products and the toxicity of correction fluid has gradually attracted people's attention. [0003] The current erasable inks are as follows: [0004] The first is to wrap dyes or pigments with polymer rubber substances to volatilize the solvent, and the rubber substances form a film att...

AI Technical Summary

Problems solved by technology

[0004] The first is to wrap dyes or pigments with polymer rubber substances to volatilize the solvent, and the rubber substances form a film attached to the writing interface, and the oil-soluble ballpoint pen erasable ink that can be wiped off with a rubber, because of the use of volatile organic solvents, Production and use are unsafe and environmentally friendly

[0005] The second is magic neutral ink. The erasability of this ink is based on the principle of acid-base color development-fading, so there are usually two pens, one is used for writing color development, and the other is used for correction. , the color will fade away, this kind of ink is inconvenient to use, and it needs to be equipped with two pens, and it is often impossible to use the same color developing pen to write again in the place where the erased characters are erased

Because the particle size of microcapsule pigments is generally larger than that of ordinary pigments, it is not easy to disperse evenly and settle easily, resulting in poor ink stability and often clogging the tip of the pen.

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