Water-based ink ball pen

Abstract

The present invention relates to a water-based ink for ball pens which comprises a water-soluble organic solvent, water, and a polysaccharide and in which two particulate pigments consisting of a colored pigment and a metallic pigment are present in the same pigment phase as aggregates in the form of spots with the aid of the water-soluble polymer serving as a binder to form a spot-form composite aggregate phase in the ink. The water-based ink for a ballpoint pen is excellent in long-term storage stability which prevents a separation-phenomenon of a colored pigment in ink, a color separation-phenomenon where light and shade of developed color appear on handwriting, can give handwriting having stable hue and can prevent generation of an ink leak and overflow of ink during long-term use thereof.

Description

technical field [0001] The present invention relates to a water-based ink for a ballpoint pen, and more particularly to a water-based ink for a ballpoint pen capable of preventing separation of pigment particles from a high-viscosity polysaccharide compound liquid over a long period of time. Background technique [0002] At present, various compositions of water-based inks for ballpoint pens containing at least a coloring agent, a polysaccharide compound and water are provided (Japanese Patent Application No. 59-74175, Patent Application No. No. 6-88050, No. 8-151547, No. 11-29734, No. 11-80629, No. 11-130998). These water-based inks can maintain high viscosity when standing still, but when writing, due to the shearing force generated by the rotation of the ball, they can show a good writing state with low viscosity. [0003] However, it is difficult to say that the storage stability of the ink after a long period of time is very good for such inks at present. In particula...

AI Technical Summary

Problems solved by technology

In the case that the nib is kept down for a long time and separation occurs, when writing with such ink, the thick colored pigment liquid that flows out from the nib first almost does not contain metal aluminum powder pigment, which will cause unrecognizable ink on the handwriting. Problems with the coloring of desired metallic shades

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