Dye discharge inkjet ink compositions
AssigneeKornit Digital Ltd.
InventorJacob Mozel
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Abstract
A dye discharge composition exhibiting extended shelf life and/or pot life and high suitability for inkjet printing on dyed substrates, is disclosed. The composition comprises a reducing agent such as, for example, a sulfur-based reducing agent, and a chelating agent, such as a sodium salt of a polyamino carboxylic acid chelating agent. Use of the dye discharge composition in combination with a translucent colored composition and an optional opaque underbase composition, for forming an image on a dyed substrate is also disclosed. Processes for inkjet printing of an image on a dyed surface using the dye discharge composition, kits for use in such processes or an ink formulation containing same are also disclosed.
Claims20
A process of inkjet printing an image directly on a surface of a dyed substrate, comprising:
- providing a dye discharge composition that comprises a sulfur-based reducing agent, a chelating agent and a first carrier, and having a pH that ranges from 3 to 6.5;
- providing at least one a colored ink composition which comprises a colorant, a dispersing agent and a second carrier, wherein said colored ink composition congeals or coagulates upon contacting said dye discharge composition;
- forming the image on the substrate by digitally applying said dye discharge composition and said colored ink composition concurrently and/or sequentially and/or concomitantly using a separate printhead for each of said dye discharge composition and said colored ink composition;
- and
- heating at least a portion of the surface having the image printed thereon to a temperature that ranges from 130° C. to 180° C., thereby discharging a dye in the dyed substrate and curing the image on the surface.
Dependencies are inferred from the claim text.