Ink formulations and uses thereof
AssigneeNovartis AG
InventorsRobert Carey Tucker, Sandra Corti
Life of this patent
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Abstract
The present invention provides a chemical ink comprises a solvent, a binder polymer, a colorant and optionally a crosslinker. The ink of the invention has one or more of the following characteristics: a viscosity lower than about 50 centipoises; a surface tension of from about 20 mN/m to about 60 mN/m; a particle size of less than about 5 μm; prolonged stability; an appropriate color level (visible by eye); uniform drop formation; jet stability; good adhesion to contact lenses; good transfer from a mold to a lens made in the mold; and stability of ink in inkjet nozzles. The ink of the invention is useful for inkjet printing of a high-quality color image on a contact lens or a mold so as to produce a colored contact lens.
Claims51
An ink comprising:
- a solvent;
- a colorant;
- and a binder polymer, wherein the ink is characterized by having a surface tension of from about 20 mN/m to about 60 mN/m, a viscosity of less than 50 centipoise, and good adhesion to a medical device.
A method for making an inkjet ink, comprising grinding a pigment in a liquid mixture comprising an organic solvent and a binder polymer.
Dependencies are inferred from the claim text.