US 12,448,533 B2
UV curable inkjet inks and inkjet printing methods
Johan Loccufier, Mortsel (BE)
Assigned to Agfa NV, Mortsel (BE)
Appl. No. 18/253,235
Filed by AGFA NV, Mortsel (BE)
PCT Filed Sep. 23, 2021, PCT No. PCT/EP2021/076150
§ 371(c)(1), (2) Date May 17, 2023,
PCT Pub. No. WO2022/106100, PCT Pub. Date May 27, 2022.
Claims priority of application No. 20208700 (EP), filed on Nov. 19, 2020.
Prior Publication US 2023/0416547 A1, Dec. 28, 2023
Int. Cl. C09D 11/38 (2014.01); B41J 2/21 (2006.01); B41J 11/00 (2006.01); B41M 7/00 (2006.01); C09D 11/037 (2014.01); C09D 11/101 (2014.01); C09D 11/322 (2014.01)
CPC C09D 11/38 (2013.01) [B41J 2/2107 (2013.01); B41J 11/00214 (2021.01); B41M 7/0081 (2013.01); C09D 11/037 (2013.01); C09D 11/101 (2013.01); C09D 11/322 (2013.01)] 17 Claims
 
1. A UV curable inkjet ink including a free radical polymerizable compound and an acyl phosphine oxide initiator, wherein the acyl phosphine oxide initiator includes an acyl group selected from the group consisting of a benzoyl group substituted by an urea group or an oxalylamide group; a 2,6-dimethyl benzoyl group substituted in position 3 by an urea group or an oxalylamide group; a 2,6-dimethoxy benzoyl group substituted in position 3 by an urea group or an oxalylamide group; a 2,4,6-trimethyl benzoyl group substituted in position 3 by an urea group or an oxalylamide group; and a 2,4,6-trimethoxybenzoyl group substituted in position 3 by an urea group or an oxalylamide group,
wherein the urea group and the oxalylamide group include a tertiary amine group positioning a phosphorus atom of the acylphosphine oxide initiator in a 1 to Z position, where position 1 is defined as that of the phosphorus atom and position Z is defined as the nitrogen atom of the tertiary amine group with Z representing an integer of at least 11; and
wherein the acyl phosphine oxide initiator contains no more than two photoinitiating moieties having a phosphine oxide group.