White inkjet ink improved for dispersion stability

摘要

An inkjet printing method includes the steps of a) providing a white inkjet ink and at least one color inkjet ink to an inkjet printer; and b) jetting the white inkjet ink at a higher temperature than the color inkjet ink onto an ink-receiver. The difference in jetting temperature between the white inkjet ink and the color inkjet ink is at least 5° C. Inkjet ink sets and inkjet printers are also disclosed.

主权项

1. A color inkjet ink set comprising:
a radiation curable white inkjet ink containing a pigment with a refractive index greater than 1.60; and at least one color inkjet ink; wherein a viscosity of the radiation curable white inkjet ink is at least 4 mPa·s greater than a viscosity of the at least one color inkjet ink, the viscosity being measured at 40° C. with a Brookfield DV-II+Pro at 12 rotations per minute; and the radiation curable white inkjet ink includes a Norrish type I initiator or a Norrish type II initiator as a photo-initiator.