INK FORMULATIONS AND FILM CONSTRUCTIONS THEREOF

摘要

Ink formulations suitable for deposition upon the intermediate transfer member of an indirect printing system and for transfer therefrom to a substrate. The inks are aqueous inkjet inks comprising an organic polymeric resin and a colorant. Ink film constructions including a plurality of continuous ink films fixedly adhered to the printing substrate that can be obtained with these inks are also disclosed. The inks and the printed constructions are such that the ink films and the dried inks composing them have a first dynamic viscosity within a range of 106 cP to 5·107 cP at at least a first temperature within a first range of 60° C. to 87.5° C., and a second dynamic viscosity of at least 6·107 cP, for at least a second temperature within a second range of 50° C. to 55° C.

主权项

1. A water-based ink formulation comprising:
(a) a solvent containing water; (b) at least one colorant dispersed or at least partly dissolved within the solvent; and (c) at least one organic polymeric resin, dispersed within the solvent; and (d) a softening agent selected to reduce a glass transition temperature (Tg) of said polymeric resin, the ink formulation forming, when dried, a substantially dry ink residue having: (i) a first dynamic viscosity within a range of 106 cP to 3·108 cP over at least part of a first temperature range of 60° C. to 110° C.; and (ii) a second dynamic viscosity of at least 6·107 cP, over at least a part of a second temperature range of 50° C. to 55° C.; said second dynamic viscosity at 55° C. exceeding the first dynamic viscosity at 85° C.; said softening agent having a pure vapor pressure of at most 0.40 kPa at 150° C.