Corrosion inhibited agricultural compositions
AssigneeMonsanto Company
InventorsGeorge B. Beestman, Erhard J. Prill
Life of this patent
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Abstract
Corrosion of metal surfaces contacted by aqueous agricultural compositions containing as an active ingredient an aminomethylenephosphonic acid, such as N-phosphonomethylglycine or an agriculturally acceptable salt or ester thereof is inhibited by the inclusion in the compositions of an inhibiting amount of a thiol compound or salt thereof.
Claims24
A herbicidal or plant growth regulant composition comprising an active ingredient selected from the aminomethylenephosphonic acids of the formula ##STR5## wherein y and z are each individually 1 or 2, and x is 0 or 1, the sum of x, y and z being 3, and the agriculturally acceptable salts and esters thereof, at least one of water or a surfactant, and a metal corrosion inhibiting amount of a thio compound selected from alkane thiols having from 2 to 16 carbon atoms in the alkane moiety, aromatic thiols, the alkali metal salts of said thiols and the ammonium and alkali metal thio salts of polybasic inorganic acids.
A method for inhibiting corrosion of iron and zinc metal surfaces in contact with an aqueous herbicidal and plant growth regulant composition comprising water, a surfactant and an active ingredient selected from the aminomethylenephosphonic acids of the formula ##STR6## wherein y and z are each individually 1 or 2, and x is 0 or 1, the sum of x, y and z being 3, and the agriculturally acceptable salts and esters thereof which comprises adding to the composition an inhibiting amount of a thio compound selected from alkane thiols having from 2 to 16 carbon atoms in the alkane moiety, aromatic thiols, the alkali metal salts of said thiols and the ammonium and alkali metal thio salts of polybasic inorganic acids.
A method which comprises contacting a plant with a phytotoxic amount of an agueous herbicidal composition comprising an amine salt of N-phosphonomethylglycine, a surfactant and a metal corrosion inhibiting amount of a thio compound selected from alkane thiols having from 2 to 16 carbon atoms in the alkane moiety, aromatic thiols, the alkali metal salts of said thiols and the ammonium and alkali metal thio salts of polybasic inorganic acids.
A method which comprises contacting a plant with a plant growth regulating amount of an aqueous plant growth regulating composition comprising a compound selected from the aminomethylenephosphonic acids having the formula ##STR7## wherein y and z are each individually 1 or 2, and x is 0 or 1, the sum of x, y and z being 3, and the agriculturally acceptable salts and esters thereof, a surfactant, and metal corrosion inhibiting amount of a thio compound selected from alkane thiols having from 2 to 16 carbon atoms in the alkane moiety, aromatic thiols, the alkali metal salts of said thiols and the ammonium and alkali metal thio salts of polybasic inorganic acids.
Dependencies are inferred from the claim text.