Process for the preparation of anionic quinophthalone dyestuffs
US4396768A · kind A · utility
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4References
2Claims
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Key dates
| Filing date | Jun 1, 1981 |
| Grant date | Aug 2, 1983 |
| Priority date | — |
| Expiry date | Jun 1, 2001 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09B25/00
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Quinophthalone dyestuffs containing sulpho groups are obtained in a particularly advantageous manner by reacting a corresponding quinaldine derivative with a phthalic anhydride at 160.degree.-240.degree. C. in quinoline.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.