Patent GB-714042-A (GB)
Title: Fungicidal preparations
IPC: A01N25/04
Filed: 1952-12-16
Abstract: A pourable fungicidal preparation comprises 10 to 75 per cent by weight of a finely divided solid material including one or more fungicides, 10 to 50 per cent by weight of a water-immiscible liquid having a viscosity at 20 DEG C below 3,000 centipoises and which does not solidify above 20 DEG C, and which substantially does not include components boiling below 50 DEG C, 0.25 to 25 per cent by weight of one or more emulsifying agents and 10 to 40 per cent by weight of water, the particle size of the solid components being below about 100 microns and not more than about 30 per cent by weight of said solid components being dissolved in the water-immiscible liquid.  The fungicide(s) may be admixed with (a) inert solids, e.g. kaolin, (b) fillers capable of absorbing 60 to 200 per cent of water and comprising 0.5 to 10 per cent of the fungicide, e.g. silica gels, magnesium oxide and clays such as pyrophyllite, kaolinite, talc, Fullers earth and bentonite; and (c) resins (0.3 to 2 per cent of the preparation) e.g. synthetic resins such as coumarone and indene resins, phenol-formaldehyde resins, and natural resins.  Specified fungicides are organic and inorganic cupric and cuprous salts, e.g. cuprous oxide, cupric oxychloride, cupric naphthenate, copper acetyl acetonate, cupric 8-hydroxy quinolinate; mercurous and mercurio salts, e.g. calomel and ethyl mercuric p-toluene sulphonamide; thiocarbamates, e.g. ferric dimethyl dithiocarbamate, zinc dimethyl dithiocarbamate, disodiumethylene bis dithiocarbamate and the corresponding zinc salt; tetramethyl thiuram disulphide; azobenzene; pentachlorophenol; p-chlorophenylphenylsulphone; N-trichloromethylthiotetrahydrophthalimide; salicylanilide; 2, 3-dichloronaphthoquinone-1,4; sulphur; red phosphorus; phosphorus triacetylide; chloranil; diels alder adduct of chloranil and cyclopentadiene or butadiene.  Specified water-immiscible liquids are chlorinated diphenyl, tetrachloroethane and other halogenated hydrocarbons; alcohols, ketones, esters, ethers, amines and silicones; hydrocarbon mineral oils, e.g. spindle oil, kerosene and gas oil; and vegetable or animal oils such as cottonseed oil, castor oil and sperm oil.  Specified emulsifiers are (a) non-ionic, e.g. ethers of alkyl phenols with polythylene glycols and N-substituted long chain fatty acid amides, and (b) ionic, e.g. sodium salts of acid alkyl esters of sulphuric acid, sulphonates and oleates.  The larger proportion of the emulsifiers is preferably of the non-ionic type.  The solids of the preparation may be ground with at least 25 per cent, and preferably, 45 to 70 per cent of liquid, preferably the water-immiscible liquid, the emulsifier dissolved in water or the water-immiscible liquid being incorporated before, during or after grinding.  Alternatively, the fungicide may be crystallized from the water-immiscible liquid by cooling the heated solution or by adding the whole or a part of the water content of the preparation in the form of ice, the preparation then being ground in a mill.  The solids may have a particle size below 25 microns and even below 10 microns.