| abstract |
Provided is a laser marking ink composition that can form a laser marking layer that enables highly visible recording. The laser marking ink composition contains a binder resin (A) and a titanium oxide (B) that causes color development in the laser marking layer under irradiation with laser light, wherein the titanium oxide (B) contains at least one surface-treated titanium oxide (BI) selected from the group consisting of alumina-treated titanium oxide (b1), alumina-silica composite-treated titanium oxide (b2), and ATO-treated titanium oxide (b3). The laser marking ink composition satisfies at least one of a condition 1 and a condition 2, wherein condition 1 is a ratio (BI/A) of the content of the surface-treated titanium oxide (BI) to the content of the binder resin (A) of 2.5 to 6.5 as the solids mass ratio, and condition 2 is a ratio (b3/A) of the content of the titanium oxide (b3) to the content of the binder resin (A) of 1.0 to 6.5 as the solids mass ratio. |