| 主权项 |
1. A water-based inkjet ink formulation comprising:
(a) a solvent containing water and, optionally, a co-solvent, said water constituting at least 8 wt. % of the formulation; (b) at least one colorant dispersed or at least partly dissolved within said solvent, said colorant constituting at least 1 wt. % of the formulation; and (c) an organic polymeric resin, which is dispersed or at least partially dissolved within said solvent, the resin constituting 6 to 40 wt. % of the formulation, wherein the average molecular weight of said resin is at least 8,000, the ink formulation having at least one of (i) a viscosity of 2 to 25 cP at at least one temperature in the range of 20-60° C. and (ii) a surface tension of not more than 50 milliNewton/m at at least one temperature in the range of 20-60° C.; and wherein at least one of the following two statements is true: (1) the ink is such that, when substantially dried, (a) at at least one temperature in the range of 90° C. to 195° C., the dried ink has a first dynamic viscosity in the range of 1,000,000 (1×106) cP to 300,000,000 (3×108) cP, and (b) at at least one temperature in the range of 50° C. to 85° C., the dried ink has a second dynamic viscosity of at least 80,000,000 (8×107) cP, wherein the second dynamic viscosity exceeds the first dynamic viscosity; and (2) the weight ratio of the resin to the colorant is at least 1:1. |
