Method of forming copper complexes of azo-dyestuffs using non-salt-forming copper (II) compounds
US4400317A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 9, 1981 |
| Grant date | Aug 23, 1983 |
| Priority date | — |
| Expiry date | Jul 9, 2001 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09B45/01
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A method of directly producing copperized azo-dyestuffs of predetermined inorganic salt content is disclosed wherein an ortho, ortho'-dihydroxyazo-dyestuff is reacted with about one molar equivalent of a copper (II) compound consisting of from 1.0 to 0.1 molar equivalent of a non-salt-forming copper compound selected from CuCO.sub.3.Cu(OH).sub.2, 2CuCO.sub.3.Cu(OH).sub.2, Cu(OH).sub.2, CuO and mixtures thereof, and correspondingly from 0 to 0.9 molar equivalent of a salt-forming copper (II) compound selected from CuSO.sub.4, CuCl.sub.2 and Cu(NO.sub.3).sub.2. The disclosed method provides standard strength copperized dyestuff compositions at increased yields and without the need to precipitate the product from the reaction solution.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.