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Agricultural Chemicals And Associated Chemicals
(AREA)
Abstract
Process for the prepn. of a stabilised aq. maneb (manganese (II) ethylene bis(dithiocarbamate)) compsn. comprises reaction of a diammonium, dipotassium or disodium ethylene bis(dithiocarbamic acid) salt with a water-soluble manganese (II) salt in aq. medium, so as to ppte. and recover the maneb. The maneb in the aq. medium is mixed with 0.05-5.0wt.% of formaldehyde and 0.05-5.0wt.% (calcd. as Zn) of a soluble zinc salt. Stabilised aq. compsns., contg. 10-50wt.% (pref. 25-40wt.%) of maneb and having a low ethylene thiourea (ETU) content, prepd. by the above method are also claimed. Maneb is a known fungicide, which when freshly prepd. contains small amts. of ETU and which is unstable and decomposes to form further ETU, the ETU content increasing with storage. The prod. prepd. by the present process contains very low amts. of ETU and its increase on storage is strongly retarded.
PT7395481A1981-11-091981-11-09Process for preparing stable aqueous fungicidal compositions
PT73954B
(en)