Preparation of .alpha.- .beta.- and .gamma.-copper phthalocyanine pigments
US4152171A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 25, 1978 |
| Grant date | May 1, 1979 |
| Priority date | — |
| Expiry date | Jan 25, 1998 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09B67/0035
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A process for the production of alpha-, beta-, and gamma-copper phthalocyanine pigments by reacting an aromatic or aromatic heterocyclic ortho-dinitrile compound and copper or a copper compound capable of providing the centrol metal atom of a phthalocyanine pigment at a temperature below 100.degree. C. in the presence of a alkaline substance in a hydrophilic aliphatic organic solvent containing one or more hydroxy groups and adding as catalyst or crystal form controller or both from the beginning of the reaction: PA1 (a) for alpha-, beta- or gamma pigments, a copper phthalocyanine in conventional pigmentary form or PA1 (b) for alpha pigments, a copper phthalocyanine derivative with a limited degree of substitution.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.