Plant protecting and regulating compositions – Plant growth regulating compositions
Patent
1996-09-05
1999-02-09
Lovering, Richard D.
Plant protecting and regulating compositions
Plant growth regulating compositions
71DIG1, 252312, 424405, 514941, 514975, A01N 2502, A01N 2530, B01J 1300
Patent
active
058694234
DESCRIPTION:
BRIEF SUMMARY
Numerous aqueous emulsions of agrochemical active substances have already been disclosed. Such formulations can be prepared, for example, by dissolving the active substances, which are generally insoluble in- water, in organic solvents and adding emulsifiers and adjuvants, the active substances, emulsifiers and adjuvants being added in quantities such that sufficiently stable emulsions are formed when the compositions are formulated with water to the application concentrations.
The prior art has disclosed oil-in-water emulsions which contain phosphorylated surfactants.
EP-A-0 224 846 describes plant protection agents based on aqueous emulsions which contain the active substance and, as dispersant, an alpha- and omega-phosphorylated ethylene oxide/propylene oxide/ethylene oxide block copolymer or a salt thereof.
A disadvantage of the emulsions described is that they are only substantially free of water-immiscible organic solvents.
EP-A-0 118 759 discloses plant protection agents in the form of aqueous emulsion concentrates which contain one or more liquid or dissolved active substances, water and, as oil- and water-soluble dispersants, from 0.5 to 20% by weight of salts of phosphorylated block copolymers based on propylene oxide and ethylene oxide, of the formula ##STR1## in which r and s independently of one another are a number between 20 and 300, being 3, and cation, ammonium, alkylammonium or alkanolammonium.
The only active substances which are mentioned as being suitable are hydrolysis-resistant insecticides, herbicides and pheromones.
U.S. Pat. No. 4,107,302 relates to aqueous insecticide concentrate mixtures which contain an active substance from the group consisting of phosphates and/or thiophosphates, and a surface-active compound. As nonionic surface-active compounds, ethoxylated alkylallylphenyl ethers are preferably employed, for example distyrylmethylphenol ethoxylate with 10 EO. A disadvantage of the mixtures described therein is the need to use an aqueous buffer solution in order to establish a pH range of from 3.0 to 8.5. Moreover, the addition of organic solvents such as ketones, ethers and alcohols is recommended for mixtures whose content of active substance exceeds 30% by weight.
EP-A-0 196 469 relates to phosphate-containing macro-emulsions where the surfactant employed to disperse the active substance is the aqueous solution of a nonylphenol-propylene oxide-ethylene oxide adduct and/or the aqueous solution of an ethylene oxide/propylene oxide/ethylene oxide block copolymer having an average molecular weight of between 2000 and 8000 and HLB values of between 8 and 30. The macroemulsions described necessarily contain glycerol as adjuvant. When employing an active substance which is solid at room temperature, a solution of the substance concerned in an aromatic diluent is used.
EP-A-0 130 370 relates to plant protection agent combinations which are obtained by mixing a dispersion of active substance and a solution of active substance. The plant protection agent combinations prepared in this way contain as phosphorylated surfactants, for example, the Na salt of C.sub.12 -C.sub.18 -alkyl polyglycol ether phosphate mono/diester (.RTM.Forlanit P, Henkel KGaA) and triethanolamide salts of a mixture of mono- and diphosylates of a tri-styrylphenol polyglycol ether having 18 EO units (.RTM.Soprophor FI, Rhone-Poulenc) and, as sulfated and sulfonated surfactant compounds, for example, the Na salt of the sulfosuccinic monoester and Na ligninsulfonate. A disadvantage of the plant protection agent combinations described therein is the use of solutions of active substances, which have a high content (from 40 to 48% by weight) of organic solvents such as xylene and methylnaphthalene.
Oil-in-water emulsions which contain nonionic surfactants as dispersants are likewise known from the prior art.
EP-A-0 289 909 relates to stable aqueous emulsions of organophosphorus pesticides which in addition to the active substance contain a nonionic block copolymer, copolymer or coblock copolymer as surfactant and al
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Damo Zoltan
Frisch Gerhard
Hanf Scott E.
Hoechst Aktiengesellschaft
Lovering Richard D.
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