Patent GB-424572-A (GB)
Title: Improvements in or relating to the manufacture of fungicidal and insecticidal materials
IPC: A01N55/06
Filed: 1933-08-21
Abstract: A mercury derivative of an aliphatic hydrocarbon is employed as a fungicide and insecticide together with an oil in water emulsion. Ethylmercurichloride and the oil-soluble aliphatic mercuri-compounds disclosed in Specification 423,506 are preferred and may be prepared by reaction of the ingredients in the oil.  In examples: (1) mercuric chloride and lead tetraethyl are warmed with transformer oil and pine oil and the lead diethyl dichloride filtered off from the solution of ethylmercurichloride; (2) ethylmercurichloride is prepared as in (1) using a mixture of p  paraffin oils in place of transformer oil; (3) and (4) monoethylether of ethylene glycol or b -b -dichlordiethylether is used instead of the pine oil of (2); (5) a solution of ethylmercurioleate is prepared by heating mercuric oxide, oleic acid, lead tetraethyl, and paraffin oil; (6) and (7) stearic acid or palmitic acid are substituted for the oleic acid of (5). Other mercuri-compounds referred to are those having the formula R-Hg-X, where R is an unsubstituted aliphatic radical and X an acid radical, for example ethylmercuri-acetate and -cyanide, and propylmercurioxalate, and those having the formulae R-Hg-OH or R-Hg-SH.  The last-mentioned can be prepared by the action of carbon disulphide on the hydroxide which in turn, is made from the alkylmercurihalide by treatment with silver hydroxide.  The Specification as open to inspection under Sect. 91 comprises the use of aromatic mercury compounds such as phenyl mercuriacetate, and mercury chlor- or nitro-phenolic compounds. Additional examples describe the preparation of ethyl mercuri-chloride, phosphate, or arsenate by mixing lead tetraethyl in a ball mill with mercuric chloride and soda ash, or with mercuric chloride or oxide, sodium sulphate, and phosphoric or arsenic acid.  This subject-matter does not appear in the Specification as accepted.ALSO:A spraying composition having fungicidal and insecticidal properties comprises an emulsion in water of one or more oils, a solvent or penetrating agent consisting of pine oil, mono-ethyl ether of ethylene glycol, or b -b -dichlordiethylether, an emulsifying agent, and a mercury derivative of an aliphatic hydrocarbon, having the said properties and soluble in at least one of the other constituents.  The oil or mixture of oils employed preferably has a viscosity of 80-100 DEG Saybolt. Ethylmercurichloride and the oil-soluble aliphatic mercuri compounds disclosed in Specification 423,506 are preferred and may be prepared by reaction of the ingredients in the oil. Oil-insoluble compounds such as ethylmercuriphosphate and arsenate can be dissolved in water together with an alkaline emulsifying agent before adding the oil.  According to examples of compositions which, before use, may be diluted to contain 0,5-2 per cent of oil: (1) mercuric chloride and lead tetraethyl are warmed with transformer oil and pine oil, the lead diethyl dichloride filtered off, and the filtrate, after addition of oleic acid, emulsified with water containing triethanolamine.  The product after dilution is used to control citrus tree pests or blue or sap stain of lumber.  (2) ethylmercurichloride is prepared as in (1) using a mixture of paraffin oils in place of transformer oil, and sodium resinate or soda ash in place of triethanolamine; (3) to a mixture of ethylmercurichloride and paraffin oils prepared as in (1) was added butylamine oleate; the product is added to water and agitated; (4) and (5) monoethylether of ethylene glycol or b -b -dichlordiethylether is used instead of the pine oil of (2); (6) a solution of ethylmercurioleate, prepared by heating mercuric oxide, oleic acid, lead tetraethyl, and paraffin oil, was diluted with paraffin oils, pine oil, and oleic acid; this can be emulsified with water containing sodium resinate or sodium carbonate; (7) and (8) stearic acid or palmitic acid are substituted for the oleic acid of (6).  Other mercuri compounds referred to are those having the formula R-Hg-X, where R is an unsubstituted aliphatic radical and X an acid radical, for example ethylmercuriacetate and -cyanide, and propylmercurioxalate, and those having the formulae R-Hg-OH or R-Hg-SH.  The last-mentioned can be prepared by the action of carbon disulphide or the hydroxide which in turn is made from the alkylmercurihalide by treatment with silver hydroxide.  The Specification as open to inspection under Sect. 91 comprises the use of any solvent or penetrating agent, aromatic mercury compounds such as phenyl mercuriacetate, mercury chlor- or nitro-phenolic compounds, inorganic compounds such as mercury chlorides or sulphate, or mercuric oxide, or organic salts such as mercuric acetate or oxalate. Additional examples describe the preparation of ethyl mercurichloride, phosphate, or arsenate by mixing lead tetraethyl in a ball mill with mercuric chloride and soda ash, or with mercuric chloride or oxide, sodium sulphate, and phosphoric or arsenic acid. The product, after addition of soda ash where necessary, is emulsified with oil, and water containing oleic acid.  This subject-matter does not appear in the Specification as accepted.