Classifications

• • A—HUMAN NECESSITIES
  • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
  • A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
  • A01N25/00—Biocides, pest repellants or attractants, or plant growth regulators, characterised by their forms, or by their non-active ingredients or by their methods of application, e.g. seed treatment or sequential application; Substances for reducing the noxious effect of the active ingredients to organisms other than pests
  • A01N25/12—Powders or granules
  • A01N25/14—Powders or granules wettable
• • A—HUMAN NECESSITIES
  • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
  • A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
  • A01N47/00—Biocides, pest repellants or attractants, or plant growth regulators containing organic compounds containing a carbon atom not being member of a ring and having no bond to a carbon or hydrogen atom, e.g. derivatives of carbonic acid
  • A01N47/08—Biocides, pest repellants or attractants, or plant growth regulators containing organic compounds containing a carbon atom not being member of a ring and having no bond to a carbon or hydrogen atom, e.g. derivatives of carbonic acid the carbon atom having one or more single bonds to nitrogen atoms
  • A01N47/28—Ureas or thioureas containing the groups >N—CO—N< or >N—CS—N<
  • A01N47/36—Ureas or thioureas containing the groups >N—CO—N< or >N—CS—N< containing the group >N—CO—N< directly attached to at least one heterocyclic ring; Thio analogues thereof

Definitions

• This invention relates to a solid delivery system (SDS) for active agricultural chemicals, and, more particularly, to a bioenhanced, stable SDS for sulfonyl and sulfamoylurea agricultural chemicals capable of forming aqueous microdispersions or tank mixes thereof suitable for application to a plant site.
• SDS solid delivery system
• Sulfonyl and sulfamoylurea (SU) herbicides are very susceptible to hydrolysis in water or in admixture with other polar organic solvents which promote proton excchange between such chemicals and the solvent.
• both the sulfonyl and sulfamoylurea compounds have a labile sulfonamide bridge which decomposes readily in water.
• stabilized liquid emulsifiable concentrates of such herbicides have been developed which when added to water to form a tank mix are suitable for application to a plant site.
• Such liquid emulsifiable concentrates are described by Narayanan et al . in copending U.S. patent application Serial No.
• a bioenhanced, stable solid carrier system for one or more sulfonyl or sulfamoyl urea agricultural chemicals suitable for forming an aqueous microdispersed tank mix upon dilution with water which comprises, by weight, (a) 80-99.5% of an inert matrix composition comprising 10-50% of a C 6 -C 18 alkyl pyrrolidone, about 5-50% of an anionic surfactant and about 10-70% of a water-soluble, high melting organic compound containing a dissociable proton which can complex with said pyrrolidone, a melting point of > 100°C.
• a further feature of the invention is an aqueous dispersion tank mix comprising dilution water in an amount sufficient to reduce the concentration of the agriculturally active ingredient to between a few ppm and 1% by weight.
• Still another aspect of the invention is a method of making such systems which comprises admixture (a) and (b) as separate components.
• the SDS includes (a) an inert matrix composition which comprises a higher lactam, i.e. a C 3 -C 18 alkylpyrrolidone, e.g. N-octylpyrrolidone, N-isooctylpyrrolidone or N-dodecylpyrrolidone, or mixtures thereof. N-octylpyrrolidone is preferred.
• the lactam is present in an amount of about 10-50%, preferably 15-40%, and most preferably, 20-30%, by weight.
• the second component is an anionic surfactant which is typified by an alkali metal salt of a C 8 -C 2 aliphatic surfactant such as sodium dodecyl sulfate, or an alkyl aromatic sulfate, or sulfonates, ethoxylated derivatives of the above, alkylphenyl ethoxylated phosphate esters, tristyryl phenyl ethoxylated phosphate esters and the like.
• Sodium dodecyl sulfate is preferred.
• the anionic surfactant is present in the amount of about 10-50%, preferably 20-45%, and most preferably, 25-35%, by weight .
• the third component is a complexing agent which is characterized by being an organic compound having a melting point of > 100°C, a molecular weight of 500, a water solubility of at least 10%, and being capable of hydrogen-bonding with the higher alkyl pyrrolidone.
• Suitable complexing agents for use herein have a dissociable proton which are present in hydroxy acids, such as lactic or citric acid; amino acids, such as glycine; sugars, such as lactose, sucrose, glucose or fructose; or amides, such as urea.
• the complexing agent is present in an amount of about 10-70%, preferably 30- 60%, and most preferably, 25-50%, by weight.
• a small amount of water is added to the mixture of components of (a) , and the mixture is sprayed, freeze-dried or fluidized to form a solid.
• the (a) component then is admixed separately with (b) , the SU, to form the desired SDS.
• the SDS comprises about 80-99.5%, by weight, of (a) and 0.5-20% of (b) , preferably 2-15%, and most preferably 3-10% of the SU.
• dispersant and/or wetting agents may be included in the SDS to assist in the formation of aqueous dispersions thereof upon dilution thereof with tank mix water.
• a hydrophobic polymer, or an inorganic mineral can be added to make the SDS less hydroscopic .
• X and Y are selected from the following:
• Sulfonylurea herbicides are effective at very low doses, i.e. at a rate of application of only grams per acre. However, it is important to avoid an overdose during use. For this reason, sulfonylureas generally are used in combination with a diluent agchemical in an amount of about 20-50% by weight of the concentrate. Such diluent agchemicals usually have broad spectrum activity at a dosage rate of lbs per acre. Another advantage of using diluent agchemicals in the concentrate is that while sulfonylureas are available commercially only as solids, the diluent agchemical can be obtained in liquid form, e.g. as an emulsifiable concentrate. Accordingly, their admixture will provide a diluted liquid premix of the active for transport and use in preparing the stabilized liquid emulsifiable concentrate of the invention.
• diluent agchemicals for use herein include :
• Phenoxy compounds e.g. phenoxy acetates (MCPA esters), phenoxy propionates, and phenoxy butyrates (MCPB esters) ;
• Benzoates e.g. Dicamba
• Chloroacetamide/chloroacetanilides e.g. Alachlor, Acetachlor, and Metolachlor
• Triazine derivatives e.g. Metrubuzin
• Triazinone e.g. Metamitron
• Phenylurea e.g. Linuron and Diuron

Landscapes

• Life Sciences & Earth Sciences (AREA)
• Health & Medical Sciences (AREA)
• General Health & Medical Sciences (AREA)
• Dentistry (AREA)
• Plant Pathology (AREA)
• Engineering & Computer Science (AREA)
• Pest Control & Pesticides (AREA)
• Agronomy & Crop Science (AREA)
• Wood Science & Technology (AREA)
• Zoology (AREA)
• Environmental Sciences (AREA)
• Toxicology (AREA)
• Agricultural Chemicals And Associated Chemicals (AREA)

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Publications (1)

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Cited By (2)

Citations (5)

Family Cites Families (1)

• 1997
  • 1997-05-02 US US08/850,792 patent/US5928992A/en not_active Expired - Lifetime
• 1998
  • 1998-03-19 WO PCT/US1998/005407 patent/WO1998049894A1/en active Application Filing
  • 1998-03-19 AU AU65694/98A patent/AU6569498A/en not_active Abandoned

Patent Citations (6)

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