Radiation curable ink jet ink composition and ink jet recording method
The invention provides a radiation curable ink jet ink composition including: a monomer equal to or more than 20% by mass and equal to or less than 50% by mass with respect to the total mass of the ink composition, which is represented by the following formula (I); and N-vinylcaprolactam equal to or more than 5% by mass and equal to or less than 15% by mass with respect to the total mass of the ink composition: CH 2 ═CR 1 —COOR 2 —O—CH═CH—R 3 (I) wherein, R 1 is a hydrogen atom or a methyl group, R 2 is a divalent organic residue having 2 to 20 carbon atoms, and R 3 is a hydrogen atom or monovalent organic residue having 1 to 11 carbon atoms.
1. A radiation curable ink jet ink composition comprising:
a monomer equal to or more than 20% by mass and equal to or less than 50% by mass with respect to the total mass of the ink composition, which is represented by the following formula (I); and
N-vinylcaprolactam equal to or more than 5% by mass and equal to or less than 15% by mass with respect to the total mass of the ink composition:
CH 2 ═CR 1 —COOR 2 —O—CH═CH—R 3 (I)
wherein, R 1 is a hydrogen atom or a methyl group, R 2 is a divalent organic residue having 2 to 20 carbon atoms, and R 3 is a hydrogen atom or monovalent organic residue having 1 to 11 carbon atoms.
2. The radiation curable ink jet ink composition according to claim 1 , wherein the monomer is 2-(vinyloxyethoxy)ethyl acrylate.
3. The radiation curable ink jet ink composition according to claim 1 , wherein the radiation curable ink jet ink composition further contains a polyfunctional acrylate equal to or more than 5% by mass and equal to or less than 20% by mass with respect to the total mass of the ink composition.
4. The radiation curable ink jet ink composition according to claim 3 , wherein the polyfunctional acrylate is a polyfunctional acrylate having a pentaerythritol skeleton.
5. The radiation curable ink jet ink composition according to claim 1 , wherein the radiation curable ink jet ink composition further contains a photopolymerization initiator.
6. The radiation curable ink jet ink composition according to claim 1 , wherein a recording medium to which the ink composition is attached is a package substrate or semiconductor substrate.
7. A recorded matter comprising:
the package substrate or semiconductor substrate as a recording medium; and
a cured material of the radiation curable ink jet ink composition according to claim 1 recorded on the package substrate or the semiconductor substrate.
8. An ink jet recording method comprising:
ejecting the radiation curable ink jet ink composition according to claim 1 onto a recording medium; and
curing the ejected ink composition by irradiation with active radiation rays having an emission peak wavelength in a range of equal to or longer than 350 nm and equal to or shorter than 400 nm.