Patent GB-1056887-A (GB)
Title: Aqueous powder mixture
IPC: A01N25/14
Filed: 1964-09-09
Abstract: An aqueous suspension comprising water and a powder composition comprising a water-in-soluble particulate wettable toxicant powder and a water-soluble polyelectrolytic organic polymer having an average molecular weight of at least 800,000, or a water-soluble salt thereof, the polymer being prepared from a monomer containing the group > C = C-R where R is a nitrile, amide or -COOM group, M being hydrogen, an ammonium radical, a metal or an organic radical, may be used as an agricultural spray.  Preferably 0.01 to 10% based on the total weight of wettable toxicant powder of the polymer is used, and the amount of wettable toxicant powder employed is 0.1 to 40% of the composition.  In the examples: (1) Polyacrylamide, powdered calcium arsenite and water are mixed together; (2) Hydrolysed polyacrylonitrile, powdered sulphur and water are mixed together; (3) hydrolysed styrene-maleic anhydride copolymer and powdered paris green of approximate formula (CuO)3As2O3.Cu(C2H3O)2 are mixed together and then blended with water, and (4) an aqueous solution of polyacrylamide is sprayed on to powdered 2,4-D(2,4-dichlorophenoxy acetic acid), the coating dried and the coated particles mixed with water.ALSO:A water-insoluble particulate wettable toxicant powder is coated with a water-soluble polyelectrolytic organic polymer having an average molecular weight of at least 800,000 or a water-soluble salt thereof, the polymer being prepared from a monomer containing the group > C = C - R where R is a nitrile, amide or -COOM group, M being hydrogen, an ammonium radical, a metal or an organic radical. The coated powder may be suspended in water and used as a herbicide, fungicide, nematocide, insecticide, miticide, bactericide, rodenticide, pest repellant, soil fumigant or fertiliser.  An extensive list of toxicant powders are given but in an example powdered 2,4-D(2,4-dichloro-phenoxy-acetic acid) is placed on a conveyor and sprayed with a 0.1% aqueous solution of polyacrylamide. The coated powder is dried at 110 DEG F. to leave 0.2 pounds (dry weight) of polyacrylamide on 2,000 pounds (dry weight) of the powder. The polymers may be homopolymers, or copolymers with monomers such as ethylene, propylene, isobutylene, styrene, a -methylstyrene, vinyl acetate, vinyl formate, vinyl chloride vinylidene chloride. A list of suitable polymers is given.ALSO:An aqueous suspension comprising water and a powder composition comprising a water-insoluble particulate wettable toxicant powder and a water-soluble polyelectrolytic organic polymer having an average molecular weight of at least 800,000, or a water-soluble salt thereof, the polymer being prepared from a monomer containing the group >C=C-R where R is a nitrile, amide or -COOM group, M being hydrogen, an ammonium radical, a metal or an organic radical, may be used as a herbicide, fungicide, nematocide, insecticide, miticide, batericide, rodenticide, pest repellant, soil fumigant or fertiliser.  An extensive list of toxicant powders are given.  Preferably 0.01 to 10% of the polymer, based upon the wettable toxicant powder, is used, and the amount of wettable toxicant powder employed is 0.1 to 40% of the composition.  In the examples:-(1) Polyacrylamide, calcium arsenite in which the particles have an average diameter of 12m  and water are mixed together and then sprayed onto cotton plant to control both weeevils; (2) Hydrolyzed polyacrylonitrile, powdered sulphur having an average diameter of 50m  and water are mixed together and sprayed onto grape vine leaves to control the fungus oidium; (3) Hydrolyzed styrenemaleic anhydride copolymer and paris green of approximate formula (CuO)3As2O3.Cu(C2 H3O)2, the particles having an average diameter of 25m  are mixed together, blended with water and sprayed on to potato plants to control potato bugs and (4) An aqueous solution of polyacrylanide is sprayed onto powdered 2,.4-D(2,4-dichlorophenoxy acetic acid) and the coating dried.  The coated particles are then added to water and the mixture sprayed on to pigweeds.