AQUEOUS INK COMPOSITION FOR BALLPOINT PEN

PROBLEM TO BE SOLVED: To provide an aqueous ink composition that is used by filling it into a ballpoint pen and provides handwriting having such visual angle dependency as to give strong brightness and a continuous change of brightness and vivid hue according to the viewing direction when writing on not only a plain paper but also a coated paper such as a coat paper or the like.SOLUTION: A brilliant aqueous ink composition for a ballpoint pen comprises at least not less than 0.1 wt% to not more than 10.0 wt% of a brilliant pigment colored in a chromatic color selected from a metal vapor-deposited film, a glass flake and colored aluminum, not less than 0.5 wt% of a dye and a mixture of dyes having a hue difference of not less than 1 to not more than 6 between the brilliant pigment and the dye and the mixture of dyes in 20 color hue circle of the Munsell color system, N-fatty acid acyl-L-glutamate, a polyoxyethylene hardened castor oil, a shear thinning agent and water.SELECTED DRAWING: None 【課題】ボールペンに充填して使用し、普通紙はもとよりコート紙などの塗工紙に筆記した際にも、強い光輝性と見る方向によって光輝性と鮮やかな色相の連続的な変化が得られる、視角依存性のある筆跡が得られる、水性インキ組成物を提供することにある。【解決手段】 金属蒸着フィルム、ガラスフレーク、着色アルミニウムから選ばれる有彩色に着色された光輝性顔料を０．１重量％以上１０．０重量％以下と、この光輝性顔料とマンセル表色系の２０色の色相環において、色相差が１以上６以内の染料及び染料の混合物を０．５重量％以上と、Ｎ−脂肪酸アシル−Ｌ−グルタミン酸塩と、ポリオキシエチレン硬化ヒマシ油と、剪断減粘性付与剤と、水とを少なくとも含むボールペン用光輝性水性インキ組成物。【選択図】なし