Curable inks comprising polymer-coated magnetic nanoparticles
AssigneeXerox Corporation
InventorsGabriel Iftime, Naveen Chopra, Barkev Keoshkerian, Peter G. Odell, Marcel P. Breton
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Abstract
There is provided novel curable ink compositions comprising polymer-coated magnetic metal nanoparticles. In particular, there is provided ultraviolet (UV) curable gel inks comprising at least the coated magnetic metal nanoparticles, one curable monomer, a radiation activated initiator that initiates polymerization of curable components of the ink, a gellant. The inks may also include optional colorants and one or more optional additives. These curable gel UV ink compositions can be used for ink jet printing in a variety of applications.
Claims20
A black or dark brown ink comprising:
- a curable ink carrier comprising
- a monomer,
- a photoinitiator,
- an optional curable oligomer, and
- one or more optional additives;
- coated magnetic nanoparticles, wherein the coated magnetic nanoparticles are comprised of a magnetic metal core and a protective coating disposed on the magnetic metal core, wherein the protective coating comprises a polymeric material, wherein the coated magnetic nanoparticles is present in an amount of about 0.5 weight percent to about 30 weight percent of the ink;
- and
- an optional colorant.
A black or dark brown ink comprising:
- a curable ink carrier comprising
- a monomer,
- a photoinitiator,
- an optional curable oligomer, and
- one or more optional additives;
- coated magnetic nanoparticles, wherein the coated magnetic nanoparticles are comprised of a magnetic metal core and a protective coating disposed on the magnetic metal core, wherein the protective coating comprises a polymeric material, wherein the coated magnetic nanoparticles is present in an amount of about 0.5 weight percent to about 30 weight percent of the ink;
- a gellant;
- and
- an optional colorant.
An ink comprising:
- a curable ink carrier comprising
- a monomer,
- a photo initiator,
- an optional curable oligomer, and
- one or more optional additives;
- coated magnetic nanoparticles, wherein the coated magnetic nanoparticles are comprised of a magnetic metal core and a protective coating disposed on the magnetic metal core, wherein the protective coating comprises a polymeric material, and further wherein the polymeric materials are selected from the group consisting of amorphous homopolymers and copolymers, crystalline homopolymers and copolymers, polymers and oligomers with a Mw of from about 500 Daltons to about 5000 Daltons and an Mn from about 100 to 500, polymers and oligomers with a Mw of from about 5000 Daltons to about 1,000,000 Daltons and an Mn from about 1000 to 1,000,000, and mixtures thereof;
- and
- an optional colorant,
- wherein the ink is used for Magnetic Ink Character Recognition (MICR) applications.
Dependencies are inferred from the claim text.