Plant protecting and regulating compositions – Plant growth regulating compositions
Patent
1996-08-29
1998-05-05
Clardy, S. Mark
Plant protecting and regulating compositions
Plant growth regulating compositions
504143, 504301, A01N 2504, A01N 4722
Patent
active
057474176
DESCRIPTION:
BRIEF SUMMARY
This application has been filed under 35 USC 371 as the national stage of international application PCT/FI95/00108 filed Feb. 28, 1995.
The present invention relates to a method for producing suspension pesticide compositions, said compositions in the form of an effective agent may contain carbamoyl-oxyphenyl carbamates, surfactants, suspending agents, known as such in the art, water, and possibly some other additives, such as organic solvents, stabilizers, defoaming, thickening and defreezing agents, dyes and preservatives.
The pesticid compositions can roughly be divided into two main categories: solid and liquid formulations. The selection is primarily affected by the solubility properties of the effective agent and on the other hand, the biological effect of the product. Certain effective agents are so poorly soluble that in practice it is not possible to provide sufficiently concentrated, genuine, liquid formulations therefrom.
In such an instance, the only possibility to produce a formulation are solid products or a liquid suspension concentrate in which the effective agent is still present as solid particles suspended in water or some other carrier agent.
As regards the user and the environment, a genuine aqueous solution would be most advantageous, but the poor solubility of the effective agent or decomposition in water often forms an obstacle for the use of this product form.
Since water cannot be used as a solvent, organic solvents have to be adopted. By adding emulsifying agents, the product becomes an emulsion concentrate emulsifying with water. A drawback of said formulations is the toxicity and inflammability of organic solvents, and sometimes difficulties in producing a permanent non-crystallized emulsion from a product with water.
The product forms in which the effective agents are not in dissolved form are advantageous as such because in such instances problems related to toxicity, inflammability, packaging materials and storage are in general avoided. However, their biological effect is often insufficient because, especially concerning leaf-affecting herbicides, penetrating ability and translocation ability within a plant is required in order to provide adequate biological effect. Also the hydrolytic decomposition is often a problem. The effective agent in molecular form possesses in a genuine liquid the ability of penetrating the wax and cuticle layers more efficiently than a solid particle. Therefore, the non-soluble effective agent particles should be ground as fine as possible and their penetration and translocation abilities should be improved with oils, organic solvent additions and surfactants. Air jet and pearl mills are used in grindings in order to provide as finely powdered effective agent as possible, preferably of the order of magnitude 1 to 5 microns, both for securing the biological effect and, in suspension concentrates, also for improving storage stability.
In order to inhibit sedimentation of the solid ingredients in suspension products, various additives must be added, besides the carrier liquid, such as dispersing and suspending agents and frequently also wetting, defreezing, defoaming and preservative agents. For providing good storage stability, viscosity of a suspension must often be increased with thickening agents.
It is known in the art that carbamoyl-oxyphenyl carbamates, the most significant among which are methyl-3-m-tolyl-carbamoyl-oxyphenylcarbamate, generally called phenmedipham, and ethyl-3-phenylcarbamoyl-oxyphenylcarbamate, generally called desmedipham (BP 679283) ##STR1## where R.sub.1 and R.sub.2 are CH.sub.3 or R.sub.1 is H and R.sub.2 is CH.sub.2 CH.sub.3, are selective and good concerning their herbicide properties. Said effective agents can be used separately or in blends with each other and/or together with other pesticides particularly as a herbicide of sugar beet.
Conventionally the above-mentioned effective agents have been formulated into emulsion concentrates. But since there has been a general tendency to avoid organic solvents, and since ph
REFERENCES:
patent: 4767448 (1988-08-01), Nielsen
patent: 5178871 (1993-01-01), Thill
patent: 5321049 (1994-06-01), Smith et al.
patent: 5362707 (1994-11-01), Fiard et al.
Ahlskog Torbjorn
Harju-Jeanty Pontus
Clardy S. Mark
Hoechst Schering AgrEvo GmbH
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