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US 9,845,400 B2Granted
Water-based UV inkjet ink
AssigneeSun Chemical Corporation
InventorsShaun Lawrence Herlihy, Brian Rowatt, Derek Illsley
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Abstract
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.
Claims12
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;
- and wherein the ratio of the amine synergists to the photoinitiator of Formula I or IA is greater than 1:1.
11 more elements
Dependencies are inferred from the claim text.