Waterfast aqueous inks
US5223028A · kind A · utility
17Cited by
8References
16Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 19, 1991 |
| Grant date | Jun 29, 1993 |
| Priority date | — |
| Expiry date | Aug 19, 2011 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09D11/30
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A waterfast ink having 3.0% Food Black 2, 2.5% highly hydroxyethylated polyethyleneimine, 10.0% ammonium benzoate, and the balance water. The invention appears to function upon loss of water after printing by a polar neutralizing between the dye and the polyimine, which results in an affinity of the dye to paper. It is applicable to any dye having anionic solubilizing groups but not having quaternary ammonium and to any ammonium salt.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.