Metallic inks composition for digital offset lithographic printing
AssigneeXerox Corporation
InventorsMihaela Maria Birau, C. Geoffrey Allen, Aurelian Valeriu Magdalinis
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Abstract
The present disclosure is directed to a metallic ink composition for use in digital offset printing, comprising: metallic effect pigment particles, wherein an average equivalent sphere diameter of at least about 90% of the metallic effect pigment particles ranges from greater than 1 micrometer (μm) to 150 μm; at least one dispersant; at least one curable oligomer; and a photo initiator, wherein the metallic ink composition has a viscosity ranging from 150,000 to 1,000,000 millipascal seconds (mPa·s) at 0.1 rad/s at 25° C. Also provided is a method of digital offset printing using the metallic ink composition of the present disclosure.
Claims20
A metallic ink composition for use in digital offset printing, comprising:
- metallic effect pigment particles, wherein an average equivalent sphere diameter of at least about 90% of the metallic effect pigment particles ranges from greater than 1 micrometer (μm) to 150 μm;
- at least one dispersant;
- at least one curable oligomer;
- and
- at least one photo initiator,
- wherein the metallic ink composition has a first viscosity ranging from 150,000 to 1,000,000 millipascal seconds (mPa·s) at 0.1 rad/s at 25° C. and a second viscosity ranging from and 85,600 mPa·s at 100 rad/s at 35° C.,
- wherein the metallic ink composition further comprises an additional colorant, and wherein the additional colorant is an organic white pigment in an amount ranging from 0 to 5% by weight.
A method of digital offset printing, which method comprises:
- applying a metallic ink composition onto a surface of a re-imageable imaging member, the re-imageable imaging member having dampening fluid disposed thereon;
- forming an ink image;
- transferring the ink image from the re-imageable surface of the imaging member to a printable substrate;
- wherein the metallic ink composition comprises:
- metallic effect pigment particles, wherein an average equivalent sphere diameter of at least about 90% of the metallic effect pigment particles ranges from greater than 1 micrometer (μm) to 150 μm;
- at least one dispersant;
- at least one curable oligomer;
- and
- at least one photo initiator,
- wherein the metallic ink composition has a first viscosity ranging from 150,000 and 1,000,000 millipascal seconds (mPa·s) at 0.1 rad/s at 25° C. and a second viscosity ranging from and 85,600 mPa·s at 100 rad/s at 35° C.,
- wherein the metallic ink composition further comprises an additional colorant, and wherein the additional colorant is an organic white pigment in an amount ranging from 0 to 5% by weight.
Dependencies are inferred from the claim text.