Improvements in or relating to a process of making a crystalline, light stable nickel chelate of 1-nitroso-2-naphthol

  • Inventors:
  • Assignees: Hercules Inc
  • Publication Date: November 02, 1966
  • Publication Number: GB-1047114-A

Abstract

The invention comprises a crystalline, light-stable nickel chelate of 1-nitroso-2-naphthol, the chelate being characterized by an X-ray diffraction pattern wich exhibits strongest d-spacings at about 11.6, 9.6, 6.0, 4.9, 4.5 and 3.6 Anstroms and a process for the preparation thereof which comprises (a) reacting a solution of 1-nitroso-2-naphthol in an inert liquid organic diluent which is a solvent for 1-nitroso-2-naphthol and which is essentially a non-solvent for said nickel chelate with a nickel compound, recovering the solid reaction product from the diluent, treating the recovered product with an electron donor solvent which is at least a partial solvent for the product while maintaining the temperature of the treatment at above about 50 DEG C. and then recovering the nickel chelate from the electron donor solvent or (b) reacting an aqueous ammoniacal solution of 1-nitroso-2-naphthol with a nickel compound at a temperature below about 40 DEG C., recovering the solid reaction product from the aqueous medium and then heating the recovered product at a temperature above about 120 DEG C. but below the decomposition point of the product until the product is converted to the crystalline, lightstable form of the nickel chelate. Inert solvents specified for use in process (a) include alkanols, methoxyethanol, tetrahydrofuran, the dimethylether of ethylene glycol, aromatic hydrocarbon and acetonitrile and electron donor solvents specified include dimethylformamide, N,N-dimethylacetamide, hexamethylphosphonamide, N-methylpyrrolidone, dimethyl sulphoxide and sulpholane. Examples are furnished.ALSO:An enamel comprises as pigment a crystalline, light stable nickel chelate of 1-nitroso-2-naphthol characterized by an X-ray diffraction pattern which exhibits strongest d-spacings at about 11.6, 9.6, 6.0, 4.9, 4.5 and 3.6 Angstroms (see Division C4), optionally aluminium paste, short oil soya alkyd resin and melamine formaldehyde resin.

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