Drug – bio-affecting and body treating compositions – Designated organic active ingredient containing – Having -c- – wherein x is chalcogen – bonded directly to...
Patent
1990-07-24
1993-03-09
Raymond, Richard L.
Drug, bio-affecting and body treating compositions
Designated organic active ingredient containing
Having -c-, wherein x is chalcogen, bonded directly to...
514521, 514531, A01N 3734, A01N 4338, A01N 5300, A01N 3114
Patent
active
051927934
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to novel plant protective microemulsion compositions, more particularly to solutions containing pyrethroids as active ingredients as well as to stable aqueous microemulsions prepared therefrom. The invention further relates to the preparation and use of these solutions and microemulsions.
BACKGROUND OF THE INVENTION
The aqueous microemulsions according to the invention can be transformed to other compositions such as aerosols by using suitable auxiliary materials.
It is known that synthetic pyrethroids are used to a continuously increasing extent in the state of the art plant protection since a satisfactory protection can be achieved by applying the active ingredient in amounts as low as 10 to 100 g/ha and on the other hand, the residue of the active ingredient becomes negligible within a relatively short time of decomposition. The pyrethroid-type active ingredients are used in the form of wettable powders (WP), suspension concentrates (FW) and most frequently as microemulsion compositions (EC). General demands made on the state of the art emulsion concentrates comprise application by an economical amount [75 to 150 g/liter (abbreviated: g/l] of a surface active agent; and safety, environmental protection and phytotoxicity.
The low amount of the surface active agent can be ensured by a suitable selection of state of the art surface active substances. For replacing xylene, the solvent manufacturers developed specific but expensive novel types of solvents whereas the formulating manufacturers made efforts to replace the solvents by aqueous systems. Thus, in the German patent specification NO. 3,235,612, aqueous microemulsions are described which contain: 0.1 to 80% by weight of active ingredient together with 1 to 20% by weight of a particular emulsifier mixture and optionally 1 to 30% by weight of organic solvent, being partly miscible with water; as well as water. The particular emulsifier is a mixture of an alkylaryl polyglycol ether with an alkylarylsulfonate salt. The emulsion stability of the emulsion concentrates reported in the German patent specification No. 3,508,643 is ensured by polyvinyl alcohol and an organic acid. The aqueous microemulsions described in the German patent specification No. 3,624,910 contain as emulsifiers a phenol or a phenolate salt substituted by ethoxylated and phosphorylated styryl group in combination with one or more non-phosphorylated emulsifying agent(s) together with 5 to 30% by weight of an usual solvent.
The aqueous microemulsions set forth in the published European patent application No. 0,160,182 contain pyrethroids and phosphoric acid esters as active ingredients and ethoxylated tristyrylphenol, ethoxylated distyrylphenol-ammonium sulfate and an alkylarylsulfonate as emulsifying agents. Emulsion concentrates containing low molecular aliphatic alcohols and ketones as stabilizing agents are described in the published Japanese patent application No. 51-59778.
Another problem of the EC-type compositions arises in that a stable spray liquid, required to remain stable in most cases for at least 24 hours, has to be prepared from the given emulsion concentrates by using waters with various hardnesses. In addition, synthetic pyrethroids are weakly soluble in aliphatic hydrocarbons and apolar solvents which in turn are preferred from the viewpoint of phytotoxicity, environmental protection and safety; thus, they can meet the criterion of the cold-resistance only with difficulties.
OBJECT OF THE INVENTION
The object of the invention is to prepare an emulsion solution (pre-formulation) with a composition meeting the demands made on the state of the art emulsion concentrates such as the low surface active agent content, absence of aromatic solvents and the possibility of preparing a stable aqueous microemulsion even under the extreme use conditions.
SUMMARY OF THE INVENTION
Thus, the present invention relates to a novel solution of a plant protective agent, 1 liter of which contains and nonylphenol, agents, naphthene, res
REFERENCES:
patent: 4902510 (1990-02-01), Garden
patent: 4997642 (1991-03-01), Curtis et al.
patent: 5013754 (1991-05-01), Hidasi et al.
Hackh's Chemical Dictionary, p. 313, Grant (1986).
CIPAC Handbook, vol. 1, Analysis of Technical and Formulated Pesticides, Ashworth et al (1976), pp. 875-879.
Karadi Zoltan
Kollarik nee Hasek Viktoria
Marmarosi (nee Kellner) Katalin
Nagy Lajos
Pap Laszio
Chinoin Gyogyszer es Vegyeszeti Termekek Rt.
Clardy S. Mark
Dubno Herbert
Myers Jonathan
Raymond Richard L.
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