Patent ID: 7674327

Claim:
A method of producing a composition for use as a flexographic water-based ink vehicle, ink additive or printing ink comprising admixing (a) two or more rosins, the rosins being selected from the group consisting of tree rosins, tall oil rosins, gum rosins, wood rosins, and esters and salts thereof, wherein the rosins consist of a fumaric modified rosin or resin and a maleic modified rosin or resin, wherein: (i) the fumaric modified rosin or resin is present in an amount of about 3 to about 40 wt. % based on the weight of the composition excluding any colorant present; and (ii) the maleic modified rosin or resin is present in an amount of about 15 to about 70 wt. % based on the weight of the composition excluding any colorant present.