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

Claim 21:
22. A method of making a photochromic inkjet ink for printing visible marks having a first color on a substrate with an inkjet printer, the printed marks changing to a second color, different from the first color, upon exposure to sunlight or UV light, the method comprising:
dissolving a photochromic dye, at 0.1% to 10% by weight of the ink composition, in a non-volatile organic solvent;
dissolving a colorant, at 0.1% to 5% by weight of the ink composition, in the non-volatile organic solvent containing the photochromic dye;
mixing a polymer resin, at 1% to 10% by weight of the ink composition, into the non-volatile organic solvent containing the polychromatic dye and colorant, and
wherein the photochromic inkjet ink is configured to be printed by the inkjet printer and includes the mixture of the polymer resin with the non-volatile organic solvent containing the polychromatic dye and colorant.