| 摘要 |
PROBLEM TO BE SOLVED: To provide an oil-based ink for ballpoint pens, which prevents clogging due to the sedimentation of a pigment with time even if the pigment is used as a colorant. SOLUTION: The oil-based ink for ballpoint pens comprises at least a pigment, a copolymer having a constitutive unit comprising at least a monomer having a carboxylic acid group in the molecule, an organic solvent, and a crosslinking-type poly(N-vinyl carboxylic amide). COPYRIGHT: (C)2009,JPO&INPIT
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