| 摘要 |
PCT No. PCT/JP97/01281 Sec. 371 Date Oct. 9, 1998 Sec. 102(e) Date Oct. 9, 1998 PCT Filed Apr. 14, 1997 PCT Pub. No. WO97/39070 PCT Pub. Date Oct. 23, 1997The oil base pigment ink composition for writing tools comprising at least a pigment, a basic resin having an amino group and an alcohol base solvent and/or a glycol ether base solvent, wherein the basic resin described above is a resin copolymerized monomers containing at least one of a vinyl monomer having a heterocyclic amino group, a vinyl monomer having an aliphatic primary amino group, a vinyl monomer having an aliphatic secondary amino group or a vinyl monomer having an aliphatic tertiary amino group and has preferably a weight average molecular weight of 50000 or less. The pigment is preferably carbon black, particularly preferably carbon black having a pH of 6 or less.
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