Water resistant security ink composition
US5304587A · kind A · utility
17Cited by
14References
30Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 19, 1991 |
| Grant date | Apr 19, 1994 |
| Priority date | — |
| Expiry date | Dec 19, 2011 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41M3/14
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A security composition for use with an ink composition including diphenyl guanidine and acrylic resin. The ink composition may further include a glycol ether and a plasticizer and can be printed on paper, for example in the word "VOID". If bleach is used to attempt to alter the document, the initially colorless ink will form a colored image in the shapes or letters printed on the paper. The ink composition is resistant to leaching upon contact with, for example, water.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.