Plant protecting and regulating compositions – Plant growth regulating compositions
Patent
1996-02-02
1998-05-19
Dees, Jose G.
Plant protecting and regulating compositions
Plant growth regulating compositions
514143, 514975, A01N 2530, A01N 5700
Patent
active
057535914
DESCRIPTION:
BRIEF SUMMARY
This application is a 371 of PCT/EP95/00641 filed Feb. 22, 1995.
The present invention relates to liquid formulations of endosulfan in the form of suspension concentrates.
It is known that endosulfan sulfite! is an active substance having an insecticidal activity (see U.S. Pat. No. 2,799,685). The active substance may be formulated in various ways, for example as an emulsifiable concentrate (EC), wettable powder (WP), water-dispersible granules (WG), concentrated aqueous emulsion (EW) and, finally, also as a suspension concentrate (SC). The advantages of SC formulations are, mainly, no development of dust and the absence of flammable solvents, and this latter fact can have positive effects mainly on the dermal toxicity to the user.
U.S. Pat. 4,804,399 discloses an SC formulation of endosulfan which, in addition to the active substance, comprises the alkali metal salt of a sulfosuccinic monoester and an alkali metal salt of a lignosulfonic acid in a mixture with a swellable alkaline earth metal silicate. This SC formulation is relatively viscous (>400 mPas). Moreover, it comprises auxiliaries which do not meet the Environmental Protection Agency (EPA) requirements for auxiliaries (Exempt from tolerance under EPA Regulation 40 CFR 180.1001, c, d).
It must therefore be considered as surprising that it was possible to find a surfactant combination of auxiliaries which conform with EPA requirements, resulting in a stable SC formulation of endosulfan of particularly low viscosity. Moreover, these aqueous SC formulations cover a wide range of concentrations of suspended active substance, which is even more surprising, bearing in mind the high specific gravity of endosulfan (1.8 g/cm.sup.3), which is markedly higher than in the case of similar active substances for SC formulations, such as isoproturon (1.2 g/cm.sup.3), linuron (1.5 g/cm.sup.3) and carbendazim (1.5 g/cm.sup.3).
The invention therefore relates to aqueous suspension concentrates of endosulfan comprising a surfactant combination of (1) a neutralized phosphoric ester based on an ethoxylated alkylphenol and (2) an ethoxylated alkylaryl- and alcohol phosphate ester, the concentration of active substance preferably being 50 to 650 g/l, in particular 300 to 500 g/l.
The combination according to the invention of the above-mentioned surfactant component (1), which is commercially available as .RTM.Emcol CS 1361 (Witco Corp.), with the abovementioned surfactant component (2) having preferably 9EO, which is commercially available as .RTM.Soprophor PA19 (Rhone Poulenc), is of utmost importance for the grindability in the preparation of the concentrate according to the invention and for its storage stability. This surfactant mixture, in which the ratio by weight of components (1) and (2) can vary from 100:1 to 1:100, preferably 10:1 to 1:10, in particular 3:1 to 1:3, moreover clearly suppresses crystal growth, which additionally contributes to the stability of this SC formulation over storage times of .gtoreq.3 months at temperatures of from -10.degree. C. to +50.degree. C.
The surfactant combination content is preferably 1 to 30% by weight, in particular 2 to 15% by weight.
Further additives or auxiliaries, preferably selected from the group of the antifoams, antifreeze agents, alkaline earth metal silicates, thickeners, preservatives, wetting agents and dispersants, may be added to the SC formulation according to the invention.
The SC formulation preferably additionally comprises 0.2 to 3% by weight of antifoam, 0 to 12% by weight of antifreeze agent, 0.5 to 10% by weight of alkaline earth metal silicate, 0 to 0.2% by weight of thickener, 0 to 2% by weight of preservative and 0 to 3% by weight of customary wetting agents and dispersants.
Examples of customary wetting agents and dispersants are polyethoxylated alkylphenols, polyethoxylated fatty alcohols, tridecyl alcohol polyglycol ether (.RTM.Genapol X-080), alkyl- or alkylphenylsulfonates, sodium lignosulfonate, sodium 2,2'-dinaphthylmethane-6,6'-disulfonate, sodium dibutylnaphthalenesulfonate or sodium o
REFERENCES:
patent: 4594096 (1986-06-01), Albrecht et al.
patent: 4770694 (1988-09-01), Iwasaki et al.
patent: 4804399 (1989-02-01), Albrecht et al.
patent: 5547918 (1996-08-01), Newton et al.
Frisch Gerhard
Maier Thomas
Badio Barbara
Dees Jos,e G.
Hoechst Schering Agreuo GmbH
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