CS249868B1 - Selective herbicidal preparation - Google Patents

Abstract

The solution relates to a herbicidal preparation based on 4-amino-1-phenyl-5-chloro-6-pyridazone prepared in the form of a dispersible concentrate. The preparation is finalized in the form of a stable aqueous suspension using surfactants, polysaccharide obtained by culturing microorganisms of the genus Xanthomonas, formaldehyde, glycol and water

Description

The present invention relates to a 4-amino-1-phenyl-5-chloro-6-pyridazone herbicidal formulation formulated as a dispersible concentrate. The formulation is formulated into a stable aqueous suspension using surfactants, a polysaccharide obtained by culturing microorganisms of the genus Xanthomonas, formaldehyde, glycol and water.

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The present invention relates to a selective herbicidal composition based on 4-amino-1-phenyl-5-chloro-6-pyridazone (chloridazone) in aqueous suspension.

According to the hitherto known production method used, the selective herbicidal preparation based on 4-amino: 1-phenyl-5-chloro-6-pyridazone is produced in the form of a dispersible powder (Burex 80). The active ingredient is finalized in the form of a fine powder together with solid fillers and in a mixture with surfactants. When used in agriculture, the dispersible powders thus produced are mixed with water to form an aqueous suspension which is sprayed immediately with agricultural crops.

The disadvantage of the production process used hitherto is the handling of pesticidal powders itself.

A further disadvantage is that if two different active substances of different states are required, the subsequent application of the individual preparations is necessary.

It has now been found that a selective chloridazone-based herbicidal preparation can be prepared in the form of a stable aqueous suspension. The present invention provides a selective herbicidal composition comprising 4-amino-1-phenyl-5-chloro-6-pyridazone in the form of an aqueous suspension. It can be prepared from chloridazone, which is suspended under stirring in water containing from 0.1 to 5 parts of a nonionic surfactant, for example Slovazol SF, which is a mixed icopolymer of propylene oxide and ethylene oxide in which the polyoxypropylene chain forms hydrophobic and the polyoxyethylene chain hydrophilic portion of the molecule.

0.1 to 3.0 parts of a nonionic emulsifier, for example Slovanik M 640, are added. To ensure stabilization of the formulation at storage temperatures below 0 ° C, 2 to 10 parts of ethylene glycol are added with stirring.

Next, the polysaccharide obtained by cultivation of microorganisms of the genus is added to the finalizing preparation with vigorous stirring.

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Xanthomonas, for example, Rodopol, and an amount of 0.1 to 0.5 parts. The content is homogenized with the addition of 0.3 to 1 part of formaldehyde, optionally diluted with water so that the active substance content is 40% by weight.

The suspension thus prepared is ground by wet grinding. It has been found that the order of addition of the individual components is optional, but it is preferable to add the polysaccharide (Rodopol j to the mixture in the form of an aqueous solution and to add chloridazone to the water containing emulsifiers).

Attempts have been made in which no surfactants have been added in the finalization process to achieve the desired suspension stability of the formulation when chloridazone treated as a dispersible powder has been added to the water.

The following examples illustrate the invention:

Example 1

To 96 ml of water and 8.8 g of formaldehyde, 0.1 g of Rodopol was added in small portions at room temperature with vigorous stirring, and the mixture was homogenized for 30 minutes. 3 g of Slavic, 86 g of chloridazone, 93.43% purity were added to the thus prepared mixture with stirring. The active substance was finely ground before addition. The contents of the flask were homogenized at room temperature for 60 minutes.

The suspension stability of the prepared selective herbicidal formulation containing 40 percent active ingredient was 81.7% and the residue on the 0.4 mm sieve was 0.26% and on the 0.125 mm sieve was 0.06.

Example 2

In Example 2, the procedure was similar to that in Example 1, only after addition of chloridazone 0.3 g of Slovaz.SF and 0.2 g of Slavonic M 640 were added to the mixture. After stirring, 8 ml of ethylene glycol was added. The suspension stability of the prepared herbicidal formulation was 93.2%.

Claims (2)

SUBJECT A selective herbicidal preparation, characterized in that it comprises: 25 to 50 wt. 4-amino-l-phenyl-5-chloro-6-one, 0.1 to 5 wt. a nonionic surfactant surfactant which is a mixed copolymer of propylene oxide and ethylene oxide; 0.1 to 3 wt. a non-ionic emulsifier produced by oxyethylation of higher fatty alcohols, 2 to 10 wt. ethylene glycol, 0.1 to 5 wt. polysaccharides obtained by culturing Xanthomonas microorganisms, 0.3 to 1 wt. formaldehyde and the remainder to 100% is water.