Compositions – Compositions containing a single chemical reactant or plural... – Organic reactant
Patent
1977-10-21
1979-12-25
Loevering, Richard D.
Compositions
Compositions containing a single chemical reactant or plural...
Organic reactant
252 495, 252180, 252312, 252356, 252DIG11, 424287, 424289, 424290, 424291, 424294, 424295, 424DIG6, C09K 300, C02B 506
Patent
active
041804732
ABSTRACT:
A method of transporting metal ions by introducing a metal complex into a medium containing a moiety which demands the metal ion and the complex releases the ions in a controlled manner upon demand. The metal complexes have an aqueous proton induced dissociation property represented by a sigmoidally-shaped curve on a cartesian coordinate plot of the negative log of the metal ion concentration versus the negative log of hydrogen ion concentration. This dissociation property causes a controlled release of metal ion into mediums containing a reacting moiety upon demand for the metal ion. For example, metalworking emulsions of oil and water are stabilized by the addition thereto of minor amounts of a metal complex, e.g., disodium monocopper(II) citrate, which at alkaline pH metalworking conditions above about 7 to about 9 releases metal cations to the emulsions imparting stabilizing characteristics which prevent emulsion degradation by a number of factors commonly encountered in metalworking operations. Also, the method is effective in the controlled release of metal ions in the normal range of physiological pH, i.e., about 4 to 9, for growth controlling action against microorganisms including bacteria, fungi and viruses.
REFERENCES:
patent: 3240701 (1966-03-01), Furia
patent: 3365397 (1968-01-01), Kolarik
patent: 3905909 (1975-09-01), Bauer
patent: 4055655 (1977-10-01), Maurer et al.
Chemical Abstracts, vol. 75, No. 5, Aug. 2, 1971, p. 164, Avakyan, Z. et al., "Comparative Toxicity of Free Ions and Copper Complexes with Organic Acids for Candida Utilis."
Bobtelsky, M. et al., "The Metallic Complexes of Tartrates and Citrates . . . ", in J. Amer. Chem. Soc., vol. 67, pp. 1824-1831, Oct. 1945.
Maurer Gerald L.
Shringarpurey Sudhir K.
Loevering Richard D.
National Research Laboratories
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