Direct thermographic materials with phenolic reducing agents
US7135432B2 · kind B2 · utility
3Cited by
8References
22Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 15, 2004 |
| Grant date | Nov 14, 2006 |
| Priority date | — |
| Expiry date | May 18, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C2001/7635
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Non-photosensitive direct thermographic materials comprise a reducing agent that is a specific ortho-amino-phenol, para-amino-phenol, or hydroquinone compound. These compounds can reduce silver(I) ion to metallic silver to produce a dense black silver image under the short time and high temperature conditions that occur when using thermal print-heads during direct thermal printing. The materials are characterized by their calculated aqueous deprotonation and their calculated anion HOMO energies.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.