Patent GB-598072-A (GB)
Title: Improvements in methods and compositions for killing weeds
IPC: A01N37/44
Filed: 1945-04-09
Abstract: Compositions for the prevention and destruction of weeds comprise a phenoxy-, phenylmercapto-, phenylimino-, naphthoxy-, naphthylmercapto-, or naphthyl-imino-aliphatic monocarboxylic acid or a lower alkyl ester, alkali metal or ammonium salt or amide or thioamide thereof in association with a non-solvent carrier or diluent, the concentration of the acid or stated derivative thereof being at least 0.1 per cent by weight of the total composition.  The phenyl and naphthyl nuclei may contain one or more substituents such as halogen, hydroxyl, NH2, HSO3, NO2, or an alkyl group, e.g. methyl, ethyl or propyl.  The following representative compounds are specified: phenoxy acetic acid, parachloro phenoxy-acetic acid, sodium parachloroacetate, parachlorophenoxy acetamide, 2.3.4.6-tetrachlorophenoxy acetic acid, pentachlorophenoxy acetic acid, 2.4.6-tribromophenoxy acetic acid, phenoxy-alpha-propionic acid, 2.4.dichlorophenoxy-alpha-propionic acid, phenyl-imino-acetic acid, phenyl - mercapto - acetic acid, 1 - naphthoxy acetic acid, potassium 1-naphthoxy acetate, 1-naphthoxy-alpha-propionic acid, 1-naphthyl-imino-acetic acid, 1-naphthyl-imino-acetamide, 1-naphthyl-mercapto-acetic acid, b -naphthoxy-acetic, acid, b -naphthoxyacetamide, b -naphthoxy-alpha-propionamide, and the methyl and ethyl esters of any of the oxy, mercapto or imino monocarboxylic acids.  In liquid form the compositions comprise also wetting, dispersing or emulsifying agents such as butyl alcohol, carbitol (diethyleneglycol), Aerosol, sulphonated vegetable oils (e.g. sulphonated castor oil, corn oil, peanut oil and soya bean oil), and polyalkylene products of the formula RO.(C2H4O)n.R1 where R is an alkyl, aryl, aralkyl, alkyl-aryl or acyl group of at least 10 carbon atoms, R1 is an alkyl, aryl, aralkyl, alkyl-aryl or acyl group or a hydrogen atom and n is an integer greater than 2, e.g. "Tween No. 20" and "Triton N.E." (Registered Trade Marks), and in the dry form they may contain conventional herbicides (e.g. sodium chlorate, ammonium sulphamate, sodium dinitro-orthocresylate or sodium arsenite) with smaller amounts of the herbicides of the invention, an inert filler such as talc or bentonite, a wetting agent in dry form such as Alkanol, an acidifying agent (e.g. citric, tartaric, succinic, malic, maleic, fumaric or sulphanic acid) and a buffer salt.  Specifications 573,929, 574,274, 598,104 and 598,105 are referred to.  The Specification as open to inspection under Sect. 91 comprises also the subject-matter of Specification 598,104 and 598,105 and herbicidal compositions comprising: benzoic acid, 2.4-dichlorobenzoic acid, 2.5-dichlorobenzoic acid, 3.5-dichlorobenzoic acid, 2.3.5-tri-iodobenzoic acid, 2-chloro-5-nitrobenzoic acid, 2-bromo-3-nitrobenzoic acid phenylacetic acid, 2-chloro phenylacetic acid, 4-chlorophenylacetic acid, 4-bromophenylacetic acid, 4-iodophenylacetic acid, phenyl-alpha-propionic acid, 4-chlorophenyl-alpha-propionic acid, phenyl-alpha and gamma-butyrate acids, 4-chloro-phenyl-alpha-acid-gamma-butyric acids, 4-methyl-phenoxyacetic acid, 2.4-dimethyl-phenoxyacetic acid, 3.4 - dimethylphenoxyacetic acid, 2.4.5 - trimethyl - phenoxyacetic acid, 4-methoxyphenoxyacetic acid, 2-chlorophenoxyacetic acid, 2.4.6 - trichlorophenoxyacetic acid, 4 - bromophenoxyacetic acid, 2.4-dibromophenoxyacetic acid, 4-iodophenoxyacetic acid, 4-fluoro-phenoxyacetic acid, 4-nitrophenoxyacetic acid, 2.4.5-trichlorophenoxy-alpha-propionic acid, 2.4-dichlorophenyliminoacetic acid, 4-chlorophenyl-mercaptoacetic acid, 2.4 - dichlorophenyl-mercaptoacetic acid, naphthalene-1-acetic acid, 2 - methylnaphthyl - 1 - acetic acid, 4 - methylnaphthyl - 1 - acetic acid, 4 - chloronaphthyl - 1 - acetic acid, 4-nitronaphthyl-1-acetic acid, 1-naphthoic acid, 2-naphthoic acid, 2-chloro-1-naphthoxyacetic acid, 2.4 - dichloro - 1 - naphthoxyacetic acid, 2-naphthyliminoacetic acid, 3 - chloro - 1 - naphthyliminoacetic acid, anthracylacetic acid, and their amides, thioamides, esters and salts; tetralyl-6-acetic acid and its salts, esters and amide; and the amide and thioamide of 2.4-dichloro-phenoxyacetic acid, with or without the following conventional herbicides: soluble chlorates, arsenic and its derivatives, carbon disulphide, boric acid, soluble borates, iron sulphate, copper sulphate, sulphuric acid, sulphanic acid, alkali sulphamates, ammonium sulphate, dinitroortho-cresylate, biuret and petroleum and coaltar and their distillates).  Carbowax may be used as a dispersing, wetting or emulsifying agent.  The compositions may be used in the form of fine-mists or aerosols by dissolving them in volatile solvents such as fluorinated hydrocarbons, e.g. tetrafluormethane, halogenated hydrocarbons containing both chlorine and fluorine, e.g. dichlorodifluoro-methane (Freon), or dimethyl ether.  This subject-matter does not appear in the Specification as accepted.