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US 10,514,626 B2Granted
Electrostatic ink compositions and scratch-off structures
AssigneeHP Indigo B.V.
InventorsInna Tzomik, Albert Teishev
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Abstract
Disclosed herein is an electrostatic ink composition comprising a component selected from a fatty acid ester having a plurality of hydroxyl substituents and a fatty acid amide having a plurality of hydroxyl substituents. Also described herein are scratch-off structures and methods for producing them.
Claims22
A method for producing a scratch-off structure, the method comprising:
- a. providing a substrate having a first layer showing information thereon, and a second layer overlying the first layer, the second layer comprising a polymeric film and being substantially transparent;
- b. electrostatically printing a third layer over the second layer, the third layer comprising a transparent electrostatic ink, wherein the transparent electrostatic ink comprises a component selected from a fatty acid ester having a plurality of hydroxyl substituents or a fatty acid amide having a plurality of hydroxyl substituents;
- and
- c. disposing a fourth layer on the third layer, the fourth layer being coloured.
1 more element
A scratch-off structure comprising the following layers in order:
- a. a substrate having a first layer showing information thereon;
- b. a second layer comprising a polymeric film and being substantially transparent;
- c. a third layer comprising a transparent electrostatic ink, wherein the transparent electrostatic ink comprises a component selected from a fatty acid ester having a plurality of hydroxyl substituents or a fatty acid amide having a plurality of hydroxyl substituents;
- and
- d. a fourth layer, wherein the fourth layer is coloured.
2 more elements
Dependencies are inferred from the claim text.