Photosensitive optically variable ink heterogeneous compositions for ink jet printing
US6827769B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 10, 2002 |
| Grant date | Dec 7, 2004 |
| Priority date | — |
| Expiry date | Apr 10, 2022 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09D11/50
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Ink compositions described are suitable for ink jet printing (ink jet inks) and are highly effective for simultaneously imparting visible and fluorescent images. In the preferred forms, both a dark, visible image and a complementary fluorescent image will be visually discernable as well as machine readable to enable efficient hand and automated processing or handling of the objects printed. These results are achieved by ink formulations that moderate the natural phenomena of quenching while possessing the physical properties necessary for an ink jet ink. In one form, the inks comprise a first colorant comprising a fluorescent dye embedded in a polymeric matrix, the fluorescent dye emitting light within a characteristic emission band when excited by fluorescent-exciting radiation; a second colorant comprising a dye or pigment having a light absorption band at longer wavelengths than the characteristic emission band of the first colorant; and an aqueous liquid vehicle comprising water and a water-soluble vehicle in sufficient amounts to achieve an ink viscosity and surface tension effective for application of the ink to a substrate in a predetermined pattern by ink jet printing. The …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.