Photo-curable ink jet ink set and ink jet recording method using the same
A photo-curable ink jet ink set includes an undercoating photo-curable ink jet ink containing a (meth)acrylic acid ester having a vinyl ether group expressed by general formula (I), and an overcoating photo-curable ink jet ink. The undercoating photo-curable ink jet ink has a higher surface tension than the overcoating photo-curable ink jet ink.
1. A photo-curable ink jet ink set comprising:
a white photo-curable ink jet ink containing a (meth)acrylic acid ester having a vinyl ether group expressed by general formula (I): CH 2 ═CR 1 —COOR 2 —O—CH═CHR 3 , wherein R 1 represents a hydrogen atom or a methyl group, R 2 represents a divalent organic residue having a carbon number of 2 to 20, and R 3 represents a hydrogen atom or a monovalent organic residue having a carbon number of 1 to 11;
a color photo-curable ink jet ink containing a phenoxyethyl (meth)acrylate; and
wherein the color photo-curable ink jet ink is either of a black ink, or a yellow ink, or a magenta ink, or a cyan ink;
wherein the white photo-curable ink jet ink and the color photo-curable ink jet ink contain an acylphosphine oxide compound as a photo-radical polymerization initiator, and the white photo-curable ink jet ink and the color photo-curable ink jet ink are photo-radical polymerization photo-curable inks.
2. The photo-curable ink jet ink set according to claim 1 , wherein the white photo-curable ink jet ink contains a bifunctional (meth)acrylate.
3. The photo-curable ink jet ink set according to claim 1 , wherein a content of the acylphosphine oxide compound of the white photo-curable ink jet ink and the color photo-curable ink jet ink are each 20% by mass or less relative to the total mass of the ink.
4. The photo-curable ink jet ink set according to claim 1 , wherein the acylphosphine oxide compound contains a 2,4,6-trimethylbenzoyldiphenylphosphine oxide.
5. The photo-curable ink jet ink set according to claim 1 , wherein the white photo-curable ink jet ink contains a phenoxyethyl (meth)acrylate.
6. The photo-curable ink jet ink set according to claim 1 , wherein the color photo-curable ink jet ink contains a tetrahydrofurfuryl (meth)acrylate.
7. The photo-curable ink jet ink set according to claim 1 , wherein the white ink is used as an undercoating photo-curable ink jet ink; and wherein the color ink is used as an overcoating photo-curable ink jet ink.