Process for the prevention or reduction of discoloration of sodi

Details Process for the prevention or reduction of discoloration of sodi Process for the prevention or reduction of discoloration of sodi

1982-02-26

1984-11-13

Hollrah, Glennon H.

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

424245, C07D21389

Patent

active

044827156

ABSTRACT:
Disclosed is a process for producing a zinc pyrithione product having an acceptable white or off-white color and preventing or reducing discoloration of sodium pyrithione solutions by treating said sodium pyrithione solutions (which are precursors to zinc pyrithione) with an effective amount of a selected reducing agent to prevent or reduce the discoloration, said reducing agent selected from the class consisting of alkali metal sulfites, alkali metal bisulfites, hydrazine, and mixtures thereof.

REFERENCES:
patent: 2809971 (1957-10-01), Bernstein et al.
patent: 4161526 (1979-07-01), Gorman
Hackh's Chemical Dictionary, Fourth Edition, 1972, pp. 481, 575.
Standard ASTM Test D1544-80.
Olin Product Data sheets for Zinc Omadine.RTM. and Sodium Omadine.RTM., (1979).

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