| 摘要 |
PROBLEM TO BE SOLVED: To provide a ball point pen which solves the problem of the leakage of an oil base ink for a ball point pen, particularly prevents the leakage of the ink even at any viscosity of the ink and further under the environmental conditions of high humidity, and does not cause blurring at the initiation of writing even under the conditions of low humidity and high temperatures to easily volatilize a solvent, and the ink for the ball point pen to be used therein. SOLUTION: The oil base ink composition for the ball point pen comprises a copolymer of a 1-4C alkyl vinyl ether, maleic anhydride, and a 6-18C diene. COPYRIGHT: (C)2003,JPO |
