Tetrabenzodiazadiketoperylene pigments for laser marking
US7544448B2 · kind B2 · utility
3Cited by
4References
18Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 30, 2006 |
| Grant date | Jun 9, 2009 |
| Priority date | — |
| Expiry date | Jul 16, 2027 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S430/146
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A method for laser marking a substrate which method comprises exposing a composition comprising a tetrabenzodiazadiketoperylene pigment to laser radiation to produce a fluorescent marking readily apparent under UV light is disclosed. Many of the tetrabenzodiazadiketoperylenes herein are novel. This method can yield fluorescent markings which are not readily apparent under ambient light. A method for producing non-fluorescent laser marked substrates containing tetrabenzodiazadiketoperylene dyes is also disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.