Oxoindolizine and oxoindolizinium compounds useful as dyes
US4577024A · kind A · utility
2Cited by
3References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 27, 1982 |
| Grant date | Mar 18, 1986 |
| Priority date | — |
| Expiry date | Aug 27, 2002 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C1/73
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Oxoindolizine and oxoindolizinium dyes are novel compounds useful in imaging, such as laser recording and reading. These dyes are formed by (1) the reaction of a cyclopropenone and a pyridine compound, (2) by reaction of (a) color-forming couplers with (b) reaction products from the reaction of cyclopropenones with pyridine compounds, or (3) by condensation reactions of indolizinols, indolizinones, and indolizinium ions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.