Reduction and inhibition of ETU content in alkylenebisdithiocarb

Details Reduction and inhibition of ETU content in alkylenebisdithiocarb Reduction and inhibition of ETU content in alkylenebisdithiocarb

1990-06-06

1992-03-31

Waddell, Frederick E.

Drug, bio-affecting and body treating compositions

Designated organic active ingredient containing

N-c doai

514973, A01N 4710

Patent

active

051009153

ABSTRACT:
A method is provided for stabilizing alkylenebisdithiocarbamates, such as 1,2-ethylenebisdithiocarbamates (EBDC), by mixing the EBDC in the presence of water with a hydroxymethane sulfinate (HMS) which degrades to formaldehyde to reduce the content of ethylenethiourea (ETU) in the EBDC. The HMS and sulfate by-product from the formaldehyde formation also act as reducing agents to inhibit further ETU formation by oxidative decomposition of EBDC. The hydroxymethane sulfinate is preferably added in an amount of about 0.1 to 5 weight percent based upon the EBDC, and the aqueous reaction mixture is then preferably dried under vacuum. Co-polymerization agents, such as hydroquinone or melamine, may also be added to further reduce and inhibit ETU content and formation.

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Merck Index, 10th Edition, #8454.

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