Patent ID: 7976148
Filing Date: 2011-07-12
Classification: C09D

Abstract:
1. A system comprising: (a) an apparatus comprising (1) means for applying an active energy ray curable aqueous ink composition, the composition comprising at least water, a polymerizable substance which undergoes radical polymerization by an active energy ray, and a polymerization initiator which generates radicals by an active energy ray, to a recording medium; and (2) means for irradiating the active energy ray curable aqueous ink composition applied on the recording medium with an active energy ray; and (b) the active energy ray curable aqueous ink composition, wherein the polymerizable substance is represented by the following general formula (1): wherein the polymerization initiator is a nonionic or anionic water-soluble acylphosphine oxide compound represented by the following general formula (2): wherein R 4 represents an alkyl group or a phenyl group, R 5 represents an alkyloxy group or a phenyl group, and R 6 represents an atomic group B represented by the following formula: wherein R 7 represents —[CH 2 ] x 2— (x2 represents 0 or 1) or a phenylene group, m2 represents an integer of 0 to 10, n2 represents 0 or 1, and R 8 represents a hydrogen atom, a sulfonic group, a carboxyl group, a hydroxyl group, or a salt thereof, wherein the content of the water is 40 to 90% by mass with respect to the total amount of the active energy ray curable aqueous ink composition, wherein the active energy ray curable aqueous ink composition is used for inkjet recording, wherein the polymerizable substance is contained in the ink in a content of 1% to 30% by mass with respect to the total amount of the ink, wherein the polymerization initiator is contained in the ink in a content of 0.1% to 7% by mass with respect to the total amount of the ink, and wherein the energy ray curable aqueous ink composition applied on the recording medium with an active energy ray is irradiated for no more than 0.1 seconds.