| 摘要 |
PROBLEM TO BE SOLVED: To obtain a water-based ink for a ballpoint pen which, even kept for a long period of time of one year or more or under a high temperature condition, is free from the precipitation of a metal pigment due to the viscosity lowering of the ink and free from deterioration in quality. SOLUTION: The water-based ink uses at least a polysaccaride having an average molecular weight of 5×10<SP>6</SP>or more to 5×10<SP>9</SP>or less, a metal pigment, and a polyoxyethylene castor oil or a polyoxyethylene hardened castor oil having an HLB of 12-18. COPYRIGHT: (C)2003,JPO |
