Enhanced reduction and inhibition of ETU content in alkylenebisd

Details Enhanced reduction and inhibition of ETU content in alkylenebisd Enhanced reduction and inhibition of ETU content in alkylenebisd

1990-03-12

1991-06-04

Prescott, Arthur C.

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

Organic compounds

Heavy metal containing

556 2, 556 37, 556 45, 556130, 556134, 556146, C07C15506, C07F 1300

Patent

active

050215949

ABSTRACT:
A method is provided for stabilizing alkylenebisdithiocarbamates, such as 1,2-ethylenebisdithiocarbamates, (EBDC) by mixing the EBDC with formaldehyde or formaldehyde releasing agents (donor) and a co-polymerization agent which forces the polymerization reaction of formaldehyde and ethylenethioureas toward completion to reduce and stabilize the content of and inhibit the formation of ethylenethiourea (ETU) in the EBDC. Paraformaldehyde as donor is preferably added in an amount of about 0.1 to 2 weight percent based upon the EBDC, together with a co-polymerization agent such as melamine or hydroquinone. The stabilized EBDC product contains aldehyde, co-polymerization agent, mono- and /or dimethylolethylenethioureas and polymerization products thereof, and less than about 0.015 weight percent ETU per se.

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