Chemistry: electrical and wave energy – Processes and products
Patent
1982-03-24
1984-05-29
Tung, T.
Chemistry: electrical and wave energy
Processes and products
204 59R, C25B 100
Patent
active
044513399
ABSTRACT:
Blue iron hexacyanoferrate-III pigments (I) are prepared by anodic oxidation of metallic iron in hydrogen cyanide, or a reaction medium containing hydrogen cyanide, at pH<7 and at an anode potential of .ltoreq.0.76 V (measured against a standard hydrogen electrode) to complex iron-II hexacyanoferrate-II compounds (II), which are then oxidized to (I) in a conventional manner. The oxidation of (II) is advantageously carried out with air or oxygen at pH 0-4 and at from 70 to 95.degree. C., but can also be carried out at pH>8.
The process gives readily dispersible pigments (I) which are of high color strength and give brilliant, glossy colorations.
REFERENCES:
patent: 2273798 (1942-02-01), Heise et al.
patent: 2353781 (1944-07-01), Neumark
patent: 4032415 (1977-06-01), Sanders
Chemical Abstracts, Band 92, Nr. 10, Mrz 1980, S. 573, Nr. 84930p, Columbus, Ohio, USA, N. N. Plotnikov et al.: "Berlin Whites", Otkrytiya, Izobret., Prom. Obraztsy, Tovarnye Znaki 1979, (42), 116-117.
Chemical Abstracts, Band 92, Nr. 6, Feb. 1980, S. 496, Nr. 49476y, Columbus, Ohio, USA & IN-A-137 245, (Counsil of Scientific and Industrial Research).
Brunnmueller Fritz
Distler Harry
Habermann Wolfgang
Hock Karl-Ludwig
Knittel Helmut
BASF - Aktiengesellschaft
Tung T.
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