Process for preparing 1-cyano-3H-dibenz[f,ij]isoquinoline-2,7-diones and their use as toners for polyesters
US5340910A · kind A · utility
32Cited by
7References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 21, 1993 |
| Grant date | Aug 23, 1994 |
| Priority date | — |
| Expiry date | Jun 21, 2013 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D221/18
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Provided is an improved process for the synthesis of 1-cyano-3H-dibenz[f,ij] isoquinoline-2,7-dione compounds, and process exhibiting improvements in quality of products, safety, fewer environmental concerns and economics when compared to presently known processes. The compounds are useful as colorants for polyesters, and selected compounds and when combined with small quantities of certain red colorants are particularly efficacious as blue toners for polyesters.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.