Patent ID: 8313666
Filing Date: 2012-11-20
Classification: B82Y,C01P,C09C,C09D,H01F

Abstract:
1. A black or dark brown ink comprising: a curable ink carrier comprising 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 further wherein the protective coating comprises a polymer terminated with a functional group which is selected from the group consisting of amide, amine, carboxylic acid, phosphine oxide, carboxylic ester, alcohol, thiol, and mixtures thereof; and an optional colorant.