申请人:Asami Hideaki
公开号:US20100040401A1
公开(公告)日:2010-02-18
A water based ink composition for a ballpoint pen containing ι-carrageenan in addition to a dye, water and a water-soluble organic solvent. When used in the ball point pen, the ink composition satisfies an ink drooling prevention and a drying resistance which are mutually incompatible functions and is excellent in writing performance regardless of containing a dye as a coloring agent. The ink composition (c) is used, for example, by accommodating a refill (
12
) whose ink accommodating tube (
18
) is filled with the ink composition and which is further loaded with an ink backflow-preventing member (
20
) in the ballpoint pen (
10
) whose writing edge is retracted and extruded from a front end opening of a barrel (
21
).