| abstract |
Disclosed is a radiation curable ink jet ink excellent in abrasion resistance, adhesion, and alcohol resistance. A radiation curable ink jet ink containing 5 to 20% by mass of N-vinylcaprolactam based on the total mass of the ink, and recording on a package substrate or a semiconductor substrate as a recording medium. It is a radiation-curable ink jet ink that is used for the above-described purpose and is attached to the package substrate or the semiconductor substrate, irradiated with radiation, and heat-treated at 150 to 200 ° C. [Selection figure] None |