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|1. (WO2018101123) LASER MARKING INK COMPOSITION|
|Applicants:||DIC GRAPHICS CORPORATION
|Title:||LASER MARKING INK COMPOSITION|
The purpose of the present invention is to provide: a laser marking ink composition that can be applied to packaging materials, particularly food packaging materials, and that exhibits jet-blackness, durability, and visibility due to a high printing density; and a recording agent obtained using the ink composition. A laser marking ink composition containing a polyurethane resin (A) having a weight-average molecular weight of 15,000-100,000 and an infrared laser coloring pigment (B), wherein the laser marking ink composition is characterized in that the content ration between the polyurethane resin (A) and the infrared laser coloring pigment (B) is 1:2.6 to 1:5 in terms of the (A):(B) mass ratio.