Patent ID: 8349915

Claim:
An ink set for inkjet printing comprising: a) at least one first ink composition comprising: a colorant; a cross-linked polymer resin encapsulating the colorant; wherein the polymer resin is prepared by polymerizing a composition comprising a polymerizable unsaturated monomer, a crosslinking agent, and a polymerization initiator, wherein the polymerizable unsaturated monomer is vinyl alcohol, styrene, (meth)acrylate, N-dimethylmaleimide, or a mixture thereof, wherein the crosslinking agent is glutal aldehyde, epichlorohydrin or 1-ethyl-3-(3-dimethylaminopropylcarbodiimide); and a solvent; and b) at least one second ink composition comprising: a colorant; a cross-linked polymer resin encapsulating the colorant; wherein the polymer resin is prepared by polymerizing a composition comprising a polymerizable unsaturated monomer, a crosslinking agent, and a polymerization initiator, wherein the polymerizable unsaturated monomer is vinyl alcohol, styrene, (meth)acrylate, N-dimethylmaleimide, or a mixture thereof, wherein the crosslinking agent is glutal aldehyde, epichlorohydrin or 1-ethyl-3-(3-dimethylaminopropylcarbodiimide); and a solvent, wherein the polymer resin in the first ink composition has a degree of swelling of about 10% to about 70%; and wherein the polymer resin in the second ink composition has a degree of swelling of about 90% to about 150%.