Intaglio magnetic machine readable oxidative drying inks
US11008477B2 · kind B2 · utility
0Cited by
23References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 26, 2017 |
| Grant date | May 18, 2021 |
| Priority date | — |
| Expiry date | Feb 11, 2038 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09D11/10
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
The present invention relates to the field of magnetic machine readable oxidative drying suitable for intaglio printing of security documents. In particular, the invention relates to magnetic oxidative drying ink for intaglio printing on a substrate, said magnetic oxidative drying ink having a viscosity in the range of about 3 to about 60 Pa s at 40° C. and 1000 s−1 and comprising a) at least one oxidative drying varnish, b) a plurality of core-shell pigment particles comprising a magnetic core and an external layer made of silver and c) one or more stabilizers selected from benzotriazole compounds.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.