Process for the preparation of copper phthalolcyanine
US4118391A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 16, 1977 |
| Grant date | Oct 3, 1978 |
| Priority date | — |
| Expiry date | Mar 16, 1997 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01F27/702
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The production of copper phthalocyanine in accordance with German Offenlegungsschrift No. 2,432,564 is improved by the process which is characterized in that the reaction product formed at 130.degree.-300.degree. C from optionally substituted phthalic anhydride, reaction products of optionally substituted phthalic anhydride with ammonia, or the dehydration products thereof, urea and, optionally, a catalyst is reacted with a copper salt and, optionally, a catalyst at temperatures of 150.degree.-350.degree. C and preferably 170.degree.-300.degree. C with the proviso that the catalyst is added either during the preparation of the starting material or during the reaction with the copper salt.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.