Process of preparation of an aqueous gel ink with fixed color comprising gold nanoparticles
US11820905B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Aug 28, 2020 |
| Grant date | Nov 21, 2023 |
| Priority date | — |
| Expiry date | Jan 30, 2041 |
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 fixed color comprising the following steps: (i) preparing a gel-based matrix of aqueous ink comprising ester(s) of retinol represented by formula (I), and (ii) adding a solution of gold salts (Au3+) to the gel-based matrix of aqueous ink prepared in step (i), to obtain an aqueous gel ink with fixed color with gold nanoparticles dispersed therein. An aqueous gel ink with fixed color obtained according to the process of the invention, comprising the ester of retinol represented by formula (I) and gold nanoparticles. A writing instrument comprising an aqueous gel ink with fixed color.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.