LU82602A1 - HERBICIDE COMPOSITION BASED ON BIPYRIDILIUM SALT - Google Patents

Description

F 'HERBICIDE COMPOSITION BASED ON BIPYRIDILIUM SALT.

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The subject of the present invention is a herbicidal composition based on

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~, bipyridilium salt containing an agent capable of imparting a bad odor to the composition itself. More particularly, it relates to a composition based on bipyridilium salts and a substance capable of. ; :> 5 give this composition a foul odor making it easy to recognize that this composition cannot be consumed. ;

It is known that those who often handle small quantities of herbicides intended for vegetable gardens, orchards or more generally in gardens, transfer the liquid compositions from their original container to 10 in bottles which are sometimes used to keep refreshing drinks and can give rise to risks of poisoning.

In order to avoid such a risk, it is common to add to the liquid herbicide forming bipyridilium salt compositions, a substance which gives the composition a foul odor which discourages anyone from consuming it by mistake.

The choice of the substance conferring a foul odor is not as easy as it might have seemed. It is of course obvious that many substances, for example, are not sufficiently soluble in water or in aqueous solutions of bipyridilum salts, and therefore give rise either to precipitates which are found at the bottom of liquid compositions, or to deposits on the surface of the liquid composition which are not distributed in a suitable manner even during the settling operations.

In addition, this substance must not react with the constituents of the composition and must, moreover, be easily stored and not deteriorate.

According to United States Patent No. 4,075,005, good results are likely to be obtained when the bipyridilium salt compositions are added with alkylcarboxylic acids such as valerianic or butyric acids, in particular quantities between 0.5 and 5¾. At pH values close to neutral, however, the offensive odor tends to disappear.

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According to the British patent NO. 1 406 881, it is possible to use a basic pyridine, that is to say a mixture of alkyl-pyridine; the latter has, however, a drawback which lies in its cost, since basic pyridine varies according to its origin and it is necessary to closely monitor its composition so that it meets the required requirements.

It has been found, and this forms the object of the present invention, that, to the herbicidal compositions based on bipyridilium salt, liquids, tert-butylmercaptan or phenylmercaptan can be added, in amounts between ... 0.025¾ and 0, 1% of the composition, at pH values of between 3 and 8, 10 and preferably of the order of 0.075% of a Tun of said mercaptans or of their mixture.

- Under such conditions, the odor must still be sufficiently perceptible even after two years of storage.

The advantages of these additives are as follows: low cost of the agent capable of imparting nauseating odor; - minimum quantities of agent required to obtain the desired effect (up to 25 times less than the quantities of alkylcarboxylic acids); - a long persistence of foul smell of the composition during storage; 20 - the agent imparts a foul odor which would discourage anyone who wants to consume the solution.

The agent which imparts the bad odor appears to be compatible with the additives' generally employed such surfactants, diluents used in the formulation of herbicides based on bipyridilium 25. The bipyridilium salt compositions generally contain from 200 to 500 g / l of herbicide. Under these conditions, the compositions can be "added to the indicated quantities of agents conferring a foul odor without giving rise to the abovementioned drawbacks.

Λ The persistence of this foul odor is the same, whether the product is maintained at an acidic pH or at an alkaline pH between 3 and 8. It is however common that the pH value is maintained at around 8.5, because in an alkaline medium or environment the bipyridilium salts are stable.

Other advantages and characteristics of the present invention will appear on reading the following description and examples given by way of illustration but not limitation.

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i / / r * ·. '' EXAMPLE 1

The following are introduced into a homogenizer: • 1,1-dimethyl-L chloride, 1 + ′ -bipyridilium L ........... 250g • water 700g.

5 With stirring, then: • nonylphenol-polyoxyethylate 20g is added.

• · quaternary cocoamine derivative 30g • silicon-based anti-foaming agent ............ 0.5g »• tert-butylmercaptan 0.5g ·, 10 The mixture is then brought to a volume 1000 ml by addition of water.

After complete dissolution, the compositions are poured into a closed bottle and kept at this temperature for two years. At the opening of the bottle, after this storage period, the solution obtained is clear and no longer exhibits the characteristics of foul odor than that of tert-butyl mercaptan.

EXAMPLE 2

In Thomogënéiseur, we introduce: • 1,1-dimethyl-L chloride, U'-bipyridilrum ............ LûOg 20 · water ............ 500g ·

Then, with stirring, the following are added: • nonylphenol-polyoxyethylate 32g • quaternary cocamine derivative k8g • anti-foaming agent based on silicon 0.5g 25 · phenylmercaptan ............ 1g.

4 The mixture is then brought to 1000 ml by addition of water, then it is stirred until complete homogenization is obtained.

The composition is subdivided into two parts: “- one part (formed of 500g) is put in a bottle as it is, 30 - another part is diluted in 300 cm3 of water.

The two bottles are then kept for two years. When opened, we see that the solutions have retained their clear state and their foul odor.

Of course, the present invention is in no way limited to the examples and modes of implementation mentioned above; it is susceptible of numerous variants accessible to those skilled in the art, depending on the applications envisaged and without departing from the spirit of the invention.

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Claims (5)

1.- Herbicide solutions or compositions based on bipyridilium salts, characterized in that they contain as an agent conferring a foul-smelling character from 0.025 to 0.1% relative to the weight of the solution or compound-5 sition of tert-butylmercaptan and / or phenylmercaptan. 2.- Herbicide solutions or compositions according to claim 1, characterized in that they contain from 200 to 500 g / 1 of bipyridilium salts. 3.- Solutions or compositions according to claim 1 or Z, characterized * in that the herbicide is the ion l, r-dimethyl-4,4'-bipyridium used in 1 an amount of the order of 200 to 600 g / 1. \ 4.- Solutions or compositions of herbicides based on bipyridilium salts! according to claim 1, characterized in that the agent conferring a nauseating character * consists of tert-butylmercaptan used in an amount of 0.025 to; 0.1% by weight of the solution or composition. 5. Solutions or compositions of herbicides based on bipyridilium salts according to claim 1, characterized in that the agent conferring a foul-smelling character consists of phenylmercaptan used in an amount of 0.025 to 0.1% by weight of the solution or composition. 6.- Herbicide solutions or compositions according to claim 1, 120 characterized in that they contain 0.075% tert-butylmercaptan and / or phenylmercaptan by weight of the solution or composition. ! / _______ | - * *