US 12,384,927 B2
Radiation-curable ink jet ink composition and ink jet printing method
Yoshinobu Yoshida, Shiojiri (JP); Kyohei Tanaka, Sagamihara (JP); and Midori Sekine, Matsumoto (JP)
Assigned to SEIKO EPSON CORPORATION, (JP)
Filed by SEIKO EPSON CORPORATION, Tokyo (JP)
Filed on Nov. 23, 2022, as Appl. No. 17/993,042.
Claims priority of application No. 2021-192105 (JP), filed on Nov. 26, 2021.
Prior Publication US 2023/0167314 A1, Jun. 1, 2023
Int. Cl. C09D 11/107 (2014.01); B41J 2/01 (2006.01); B41J 2/21 (2006.01); B41M 5/00 (2006.01); B41M 7/00 (2006.01); C09D 11/101 (2014.01); C09D 11/30 (2014.01); C09D 11/322 (2014.01)
CPC C09D 11/107 (2013.01) [B41J 2/01 (2013.01); B41J 2/2107 (2013.01); B41M 5/00 (2013.01); B41M 5/0023 (2013.01); B41M 5/0047 (2013.01); B41M 7/0081 (2013.01); C09D 11/101 (2013.01); C09D 11/30 (2013.01); C09D 11/322 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A radiation-curable ink jet ink composition, comprising:
polymerizable monomers A including at least one monofunctional monomer B and at least one multifunctional monomer C,
the polymerizable monomers A including at least one polymerizable monomer A1 whose homopolymer has a glass transition temperature of 50° C. or more in a proportion of 20% by mass or more relative to the total mass of the polymerizable monomers A,
homopolymers of the polymerizable monomers A having glass transition temperatures TgAll whose average weighted by the proportions by mass of the individual polymerizable monomers A is 25° C. to 40° C.,
the glass transition temperatures whose average weighted by the proportions by mass of the individual polymerizable monomers A is calculated by equation (1),
TgAll=ΣTgN×XN (1), where TgN represents the glass transition temperature of a polymerizable monomer, and Xx represents the proportion by mass of the polymerizable monomer,
the at least one monofunctional monomer B being contained in a proportion of 50% to 80% by mass relative to the total mass of the polymerizable monomers A,
the at least one multifunctional monomer C including vinyl group-containing (meth)acrylate C1 represented by the following general formula (I):
H2C═CR1—CO—OR2—O—CH═CH—R3  (I)
wherein R1 represents a hydrogen atom or a methyl group, R2 represents a divalent organic residue with 2 to 20 carbon atoms, and R3 represents a hydrogen atom or a monovalent organic residue with 1 to 11 carbon atoms.