Silk fibroin-based optical anti-counterfeiting mark and preparation method thereof
US10857830B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 25, 2016 |
| Grant date | Dec 8, 2020 |
| Priority date | — |
| Expiry date | Jun 5, 2037 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC23C14/205
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
The invention provides a silk fibroin-based anti-counterfeiting mark comprising a silk fibroin film layer and a gold film layer located on the silk fibroin film layer, and the area of the gold film layer is less than that of the silk fibroin film layer. The inventive also provides a method for preparing the silk fibroin-based optical anti-counterfeiting mark, the method comprises preparing an aqueous silk fibroin solution, coating the aqueous silk fibroin solution onto a substrate to obtain a silk fibroin film, and sputtering a layer of gold film on the silk fibroin film with a mask to obtain the silk fibroin-based optical anti-counterfeiting mark. In the invention a thin layer of Au film is sputtered on a silk fibroin film such that an anti-counterfeiting mark pattern appears at a high humidity, the method is simple and can significantly the production cost of optical anti-counterfeiting mark.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.