Patent Application
20070238615
The procedure of Example 1a was repeated but adding, when preparing the aqueous solution, instead of 15 g of Genapol X-150 (isotridecyl alcohol polyglycol ether with 15 EO), a mixture of 5 g of Genapol X-150 and 10 g of BEHSS-Na [i.e., bis(2-ethylhexyl)sulfosuccinate sodium] (see also Table 1).
The procedures of Examples 1a and 1b were applied analogously in order to prepare the microcapsule formulations whose compositions are specified in Tables 1 and 2.
1)Residual water (total water content = residual water content + fractions of water in the individual components)
2)In each case as an aqueous solution
3)Addition in each case after formation of microcapsules
4)Capsule formation without diamines or polyamines at elevated temperature (70° C.)
Further abbreviations for Tables 1 and 2:
Further information on preparation:
The size (particle size) of the microcapsules prepared is generally less than 50 μm, as a rule less than 20 μm, and preferably less than 15 μm. Preferred microcapsule suspensions contain microcapsules having a particle size distribution, measured on the basis of the d(10) particle diameter in the range up to 4 μm, in particular up to 1.5 μm, or measured on the d(50) particle diameter in the range up to 10 μm, in particular up to 5 μm, or measured on the d(90) particle diameter in the range up to 15 μm, in particular up to 10 μm.
The indications d(10), d(50), and d(90) here mean that 10%, 50%, and 90%, respectively, of the particles (fractions based on the volume) are smaller in diameter than that stated size in μm. The d50 value can be considered approximately as an average value of the diameter (though does not correspond exactly to the mathematical average), the indications of the three values d(10), d(50), and d(90) together being used as a measure of the breadth of distribution, or polydispersity of the distribution (strongly monodisperse is represented by d10=d50=d90). The values d(10), d(50), and d(90) for the capsule diameter can be determined for example by means of a laser diffraction spectrometer, an example being the instrument Coulter LS230.
Further formulating examples for microcapsule formulations (CS formulations)
In analogy to the methods given it is also possible to encapsulate further actives (other than fatty acid synthetase inhibitors) and to combine them with encapsulated fatty acid synthetase inhibitors, by means for example of a coformulation, or in the spray liquor.
In coformulations the fatty acid synthetase inhibitors may be microencapsulated together with or separately from other agrochemical actives.
Where they are separately microencapsulated, coformulations may for example also be obtained by the mixing of two or more microcapsule formulations each containing different actives.
Where the different actives are to be microencapsulated together, it is possible by way of example to dissolve all of the actives in solution, to prepare an emulsion from this solution, and then to microencapsulate the droplets of the emulsion.
All of the CS formulations described can be prepared by the same process, i.e., with comparable wall materials, comparable capsule dimensions, as measured by d(10), d(50), and d(90) (see elucidations earlier on above), and comparable ratio of organic phase to wall material. The loading of the CS formulation with “encapsulated” actives (fatty acid synthetase inhibitors and optional other agrochemical actives) is preferably in the range from 0.3% to 70% by weight.
Postemergence Application
Postemergence Weed Activity
Rice plant seedlings and typical rice weeds were cultivated under glass under Paddy rice conditions (water level: 2-3 cm) in pots under good growth conditions (temperature, humidity, water supply) and were treated at the two to three leaf stage with the actives. The actives, formulated as CS formulations or as oil-in-water emulsions, were sprayed at various dosages onto the green plant parts at an application rate of 300 l of water per ha (converted). After the test plants had stood under glass under optimum growth conditions for approximately 3 to 4 weeks, the activity of the products was scored visually in comparison to untreated controls. The scoring covered damage and development of all above-soil plant parts. Scoring was carried out on a percentage scale (100% activity=all plants died; 50% activity=50% of the plants and green plant parts died; 0% activity=no discernible activity=same as control). Results are summarized in Table 3.
The experiment shows that the CS formulation has a comparable activity on the weeds in combination with an improved crop plant tolerance.
| Number | Date | Country | Kind |
|---|---|---|---|
| 10 2006 015 940.3 | Apr 2006 | DE | national |
