Patent ID: 8814337
Filing Date: 2014-08-26
Classification: C09D

Abstract:
1. An inkjet ink set comprising a cyan ink, a magenta ink and a yellow ink, wherein each of said cyan, magenta and yellow inks individually comprises at least 70% water, between 1% and 5% by weight of a dispersed pigment colorant, a surfactant that reduces static surface tension to the range of 28 to 40 mN/m, a dynamic surface tension reducing agent distinct from the surfactant, and at least one humectant distinct from the surfactant and the dynamic surface tension reducing agent; wherein the humectant and dynamic surface tension agent together comprise between 8% and 20% by weight of each ink; wherein said surfactant, said dynamic surface tension reducing agent and said humectant can be the same or different between said cyan, magenta and yellow inks; wherein at least one of said inks further comprises a polyurethane binder polymer; and wherein each of said cyan, magenta and yellow inks is characterized by exhibiting a viscosity between 1.5 and 3.0 cP, a static surface tension between 28 and 40 mN/m, and a viscosity normalized dynamic surface tension at surface refresh ages of 0.01 s of less than 23.0 mN/(m*cP); and wherein the average viscosity normalized dynamic surface tension at a surface refresh age of 0.01 s for said cyan, magenta and yellow inks taken together is less than 22.0 mN/(m*cP).