Patent ID: 6248805
Filing Date: 2001-06-19
Classification: C08F,C09B,C09D

Abstract:
An ink-jet printing ink composition consisting essentially of a vehicle, a colorant, at least one property-optimizing additive, at least one core/shell polymeric binder to increase smearfastness of said composition, and a magnetic additive, said core/shell polymeric binder having a formula given by[(A).sub.m (B).sub.n (C).sub.p (D).sub.q (E).sub.r ].sub.xwherein A, B, C, D, and E are moieties as follows:A=at least one hydrophobic component contributing to improved durable, film-forming properties selected from moieties which, when homopolymerized to a solid state, have a glass transition temperature (T.sub.g) in the range between -150.degree. and +25.degree. C.;B=at least one hydrophobic and solvent barrier moiety used to adjust the T.sub.g of the hydrophobic component of said polymer which, when homopolymerized to a solid state, has a T.sub.g greater than 25.degree. C.;C=at least one hydrophilic component comprising a water-soluble monomer;D=at least one UV absorber;E=at least one moiety having at least one highly polar functional group;m=5 to 95 wt %;n=5 to 95 wt %;p=0 to 60 wt %;q=0 to 50 wt %;r=0 to 30 wt %;m+n+p+q+r=100 wt %; andx=1 to 100,000,with the proviso that at least one of said C and E moieties must present wherein said polymer has either hydrophobic and hydrophilic moieties or has only hydrophobic moieties and is associated with said surfactant to form a polymer/surfactant system, said polymer or polymer/surfactant system capable of forming a film from water, which, upon dehydration, is essentially resistant to water, said polymer having a T.sub.g within the range of about -10.degree. to +110.degree. C., said magnetic additive consisting essentially of at least one inorganic magnetic compound containing at least one of iron, cobalt, and nickel cations or at least one organic magnetic complex containing at least one of iron, cobalt, and nickel cations or at least one organic complex or charge transfer complex exhibiting magnetic properties, said polymer serving to disperse both said colorant and said magnetic additive in said ink composition, said ink composition being free of any other dispersant.