Process of preparation of an aqueous gel ink with variable color comprising silver nanoparticles
US11802214B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Aug 28, 2020 |
| Grant date | Oct 31, 2023 |
| Priority date | — |
| Expiry date | Dec 28, 2040 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C69/618
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A process for preparing in situ an aqueous gel ink with variable color comprising the following steps: (i) preparing a gel-based matrix of aqueous ink comprising an N-Acyl-aminophenol, wherein the hydroxyl group is preferably in meta or para position on the benzenic group, and (ii) adding a solution of silver salts to the gel-based matrix of aqueous ink prepared in step (i), to obtain an aqueous gel ink with variable color with silver nanoparticles disposed therein. An aqueous gel ink with variable color obtained according to process for preparing, comprising an N-Acyl-aminophenol, wherein the hydroxyl group is preferably in meta or para position on the benzenic group and silver nanoparticles. A writing instrument comprising an aqueous gel ink with variable color.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.