Mitsubishi Pencil Company, Limited

Noriko Sakane

Yusuke Kobayashi

Yoji Takeuchi

Saki Hanatani

Tomoyuki Akaki

Chihiro Nishijima

Provided are an ink composition for an aqueous ink ball point pen, which contains modified polyvinyl alcohol and at least one selected from boric acid and salts thereof, and an aqueous ink ball point pen charged with the ink composition, wherein the boric acid and the salts thereof are preferably at least one selected from boric acid, alkali metal salts of boric acid and ammonium salts of boric acid.

Ink composition for aqueous ink ball point pen

Provided is an ink composition for an aqueous ballpoint pen making it possible to draw sharp and fine lines which are less likely to be blurred at an initial part of writing and are written smoothly and which are clear at stop, jump and sweep parts to provide beautiful characters. The ink composition for an aqueous ballpoint pen contains at least water and a colorant and having a dilatant fluid characteristic in at least a part of a region of a shear rate of 1 to 383 s(25&#xb0; C.).

Growing community of inventors

Yokohama, Japan

Noriko Sakane