Ink for digital offset printing applications
AssigneesXerox Corporation, Palo Alto Research Center Incorporated
InventorsMarcel P. Breton, Frank Ping-Hay Lee, Aurelian Valeriu Magdalinis, Bing R. Hsieh, Stephan Drappel, Timothy D. Stowe, C. Geoffrey Allen, Peter Gordon Odell
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Abstract
An ink composition useful for digital offset printing applications comprises a colorant and a plurality of curable compounds. The compounds have Hansen solubility parameters as described herein, and the resulting ink composition is both compatible with certain dampening fluids and has certain rheological properties, including a low viscosity.
Claims19
An ink composition comprising a plurality of curable compounds, wherein the ink composition has a volume average Hansen fractional dispersion force parameter (fd) of from about 0.4 to about 0.62, a volume average Hansen fractional polar parameter (fp) of from about 0.1 to about 0.3, and a volume average Hansen fractional hydrogen bonding parameter (fh) of from about 0.2 to about 0.4, wherein the plurality of curable compounds includes a tetrafunctional acrylated polyester.
A process for variable lithographic printing, comprising:
- applying a dampening fluid to an imaging member surface;
- forming a latent image by evaporating the dampening fluid from selective locations on the imaging member surface to form hydrophobic non-image areas and hydrophilic image areas;
- developing the latent image by applying an ink composition comprising an ink component to the hydrophilic image areas;
- and
- transferring the developed latent image to a receiving substrate;
- wherein the ink composition comprises a plurality of curable compounds, the ink composition having a volume average Hansen fractional dispersion force parameter (fd) of from about 0.4 to about 0.62, a volume average Hansen fractional polar parameter (fp) of from about 0.1 to about 0.3, and a volume average Hansen fractional hydrogen bonding parameter (fh) of from about 0.2 to about 0.4, wherein the plurality of curable compounds includes a tetrafunctional acrylated polyester.
An ink composition comprising a plurality of curable compounds, wherein each curable compound has a Hansen fractional dispersion force parameter (fd) of from about 0.4 to about 0.62, a Hansen fractional polar parameter (fp) of from about 0.1 to about 0.3, and a Hansen fractional hydrogen bonding parameter (fh) of from about 0.2 to about 0.4, wherein the plurality of curable compounds includes a tetrafunctional acrylated polyester.
Dependencies are inferred from the claim text.