	US 12,234,367 B2
	Inkjet printing process, ink set of inkjet inks for forming an image on a substrate
Lode Erik Dries Deprez, Lier (BE); Werner Jozef Johan Op De Beeck, Putte (BE); Wouter Jeroom Maria Van Gaens, Duffel (BE); Roel De Mondt, Rumst (BE); Geert Gaston Paul Deroover, Lier (BE); Nils Margaretha Robert De Vos, Puurs-Sint-Amands (BE); and Lore Wyns, Booischot (BE)
Assigned to XEIKON MANUFACTURING N.V., Lier (BE)
Appl. No. 17/915,881
Filed by XEIKON MANUFACTURING N.V., Lier (BE)
PCT Filed Apr. 1, 2021, PCT No. PCT/EP2021/058744 § 371(c)(1), (2) Date Sep. 29, 2022, PCT Pub. No. WO2021/198480, PCT Pub. Date Oct. 7, 2021.
Claims priority of application No. 2025262 (NL), filed on Apr. 2, 2020.
Prior Publication US 2023/0135129 A1, May 4, 2023
Int. Cl. B41M 5/00 (2006.01); C09D 11/322 (2014.01); C09D 11/40 (2014.01); C09D 11/54 (2014.01)

CPC C09D 11/322 (2013.01) [B41M 5/0047 (2013.01); C09D 11/40 (2013.01); C09D 11/54 (2013.01)]

18 Claims

1. An ink set of inkjet inks for forming an image on a substrate, the inkjet inks comprising at least a first ink and a second ink, each said first and second ink comprising:

a. a pigment;

b. a block copolymer dispersant for dispersing the pigment, wherein the block copolymer dispersant comprises a first block and a second block; wherein the second block is formed using at least one monomer M2, which monomer M2 is selected from the group consisting of a methacrylate and an acrylate, wherein the monomer M2 is an anchoring monomer for anchoring to the pigment; and

c. at least one water soluble organic solvent; and

d. water;

wherein said pigment P1 of said first ink is different from said pigment P2 of said second ink; and wherein said block copolymer dispersant D1 of said first ink is different from said block copolymer dispersant D2 of said second ink, wherein the second block of the first block copolymer dispersant D1 comprises a repeating unit formed using an aryl (meth)acrylate monomer, and the second block of the second block copolymer dispersant D2 comprises a repeating unit formed using an alkyl (meth)acrylate monomer;

wherein the inkjet ink set comprises a cyan ink comprising a cyan pigment, a magenta ink comprising a magenta pigment, a yellow ink comprising a yellow pigment and a black ink comprising a black pigment;

wherein the magenta pigment is a quinacridone pigment selected from Pigment Red 122, Pigment Violet 19, and Pigment Red 202 or the magenta pigment is Pigment Red 57:1, preferably selected from Pigment Violet 19 and Pigment Red 202, and/or wherein the cyan pigment is Pigment Blue 15:3, and/or wherein the yellow pigment is selected from Pigment Yellow 155 and Pigment Yellow 74, and/or wherein the black pigment is a carbon black, preferably Pigment Black 7.