US 11,987,715 B2
Radiation curable ink jet composition and ink jet method
Naoki Koike, Matsumoto (JP); Toru Saito, Yamagata (JP); Kyohei Tanaka, Matsumoto (JP); and Kiyoshi Nakamura, Matsumoto (JP)
Assigned to SEIKO EPSON CORPORATION, (JP)
Filed by Seiko Epson Corporation, Toyko (JP)
Filed on Mar. 24, 2021, as Appl. No. 17/210,611.
Claims priority of application No. 2020-053853 (JP), filed on Mar. 25, 2020.
Prior Publication US 2021/0301158 A1, Sep. 30, 2021
This patent is subject to a terminal disclaimer.
Int. Cl. C09D 11/101 (2014.01); B41J 2/01 (2006.01); B41J 2/21 (2006.01); B41J 11/00 (2006.01); B41M 5/00 (2006.01); B41M 7/00 (2006.01); C09D 11/102 (2014.01); C09D 11/107 (2014.01); C09D 11/30 (2014.01); C09D 11/38 (2014.01)
CPC C09D 11/101 (2013.01) [B41J 2/2107 (2013.01); B41J 11/002 (2013.01); B41M 5/00 (2013.01); B41M 5/0023 (2013.01); B41M 7/0081 (2013.01); C09D 11/102 (2013.01); C09D 11/107 (2013.01); C09D 11/30 (2013.01); C09D 11/38 (2013.01); B41J 2/01 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A radiation curable ink jet composition comprising:
polymerizable compounds; and
a plurality of photopolymerization initiators;
wherein the polymerizable compounds include a monofunctional monomer,
a content of the monofunctional monomer with respect to a total mass of the polymerizable compounds is 90 percent by mass or more,
the plurality of photopolymerization initiators includes ethyl (2,4,6-trimethylbenzoyl)phenylphosphinate,
an amount of ethyl (2,4,6-trimethylbenzoyl)phenylphosphinate relative to a total amount of the plurality of photopolymerization initiators is 20 to 80 percent by mass, and
the monofunctional monomer includes nitrogen-containing monofunctional acrylate monomer, a content of the nitrogen-containing monofunctional acrylate monomer being 30% by mass or less with respect to the total mass of the polymerizable compounds.