Patent ID: 11884831
Assignee: TROY GROUP, INC.
Field: Basic materials chemistry (Chemistry)
Classification: CPC C | IPC C

Claim 26:
27. A photochromic inkjet ink formulation that prints a visible mark of a first color on a substrate and changes to a second different color upon exposure to sunlight or UV light, the formulation comprising:
a photochromic dye at about 2% by weight of the ink formulation;
a colorant at about 0.8% by weight of the ink formulation;
alcohol at about 20% by weight of the ink formulation;
acetate at about 0.2% by weight of the ink formulation;
glycol ether at about 0.5% by weight of the ink formulation;
surfactant at about 0.3% by weight of the ink formulation;
polymer resin at about 1.5% of weight of the ink formulation; and
an ester at about 73% by weight of the ink formulation, and
wherein the ink formulation is for printing by an inkjet printer.