WATER-BASED UV INKJET INK

摘要

The invention describes the use of a water-based UV curable inkjet printing ink wherein the ink is basic due to the presence of a tertiary amine, allowing the complete dissolution of an acid functional photoinitiator of Formula I or Formula IA (wherein R1, R2, R3, n, q, and y are as defined herein). This combination of photoinitiator and tertiary amine allows the rapid low dosage UV curing of a water-based UV formulation using a UV LED light source.;

主权项

1. An alkaline energy curable water-based inkjet ink or coating composition comprising:
a) a photoinitiator of Formula I: wherein each R1 is an independently selected hydrogen or a C1-C4 alkyl group, and n is a number from 0 to 8;or a photoinitiator of Formula IA wherein Formula I is further substituted with R2 and R3, wherein each R2 and R3 is independently selected from the group consisting of hydrogen, C1-C4 alkyl, C1-C4 alkoxy, and halogen;
y is 0 or 1; q is 0, 1, or 2; and n is a number from 0 to 8,and the photoinitiator has a structure of Formula IA: b) a polymer which is water-soluble, or dispersible in water either as a liquid in liquid emulsion or a particle suspension; c) water; and d) one or more tertiary amine synergists;wherein the composition has a pH of between about 7.0 and about 9.5;