Patent ID: 7829608

Claim:
A method of making a fixative for printing on a print media, the method comprising: providing at least one iso-cyanate monomer or oligomer in a first container; providing at least one polyol and at least one base catalyst in a second container; in either order, depositing, from the first container, the at least one iso-cyanate monomer or oligomer, and from the second container, the at least one polyol and the at least one base catalyst on a printed ink-jet ink established on the print media; and allowing a reaction to proceed between the at least one iso-cyanate monomer or oligomer and the at least one polyol on said print media to form a hydrophobic polymer, the hydrophobic polymer having a glass transition temperature ranging from about −50° C. to about +100° C. and a melting temperature ranging from about 30° C. to about 150° C. to thereby fix the ink-jet ink on the print media.