FR2460622A1 - HERBICIDE COMPOSITION BASED ON BIPYRIDILIUM SALT - Google Patents

Abstract

THE SUBJECT OF THE PRESENT INVENTION IS SOLUTIONS OR COMPOSITIONS OF HERBICIDES BASED ON BIPYRIDILIUM SALTS. IT IS CHARACTERIZED IN THAT THESE SOLUTIONS OR COMPOSITIONS CONTAIN AS AN AGENT PROVIDING A NAUSEABOND CHARACTER OF 0.025 TO 0.1 WITH RESPECT TO THE WEIGHT OF THE SOLUTION OR COMPOSITION OF TERT-BUTYLMERCAPTAN AND OR PHENYLMERCAPTAN. SOLUTIONS OR COMPOSITIONS ARE THUS GIVEN A NAUSEABONDE ODOR.

Description

HERBICIDE COMPOSITION BASED ON BIPYRIDILIUM SALT.

  The present invention relates to a herbicidal composition based on 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 imparting to this composition a foul odor which makes it possible to recognize

  easily that this composition can not be consumed.

  It is known that those who often handle small amounts of

  bicides for vegetable gardens, orchards or more generally gardens, transfer the liquid compositions from their original container

  in bottles that are sometimes used to preserve wood-

  refreshing sounds and may give rise to the risk of poisoning.

  In order to avoid such a risk, it is common to add to the compositions

  base of bipyridilium salt forming a liquid herbicide, a substance

  causing the composition to have a foul odor that discourages anyone from

consume by mistake.

  The choice of the substance conferring a nauseating odor is not 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 to either precipitates found in the bottom of the compositions. liquids, either to deposits on the surface of the liquid composition that are not

  distributed evenly during settling operations.

  Moreover, this substance must not react with the constituents of the com-

  position and must, in addition, be easily stored and not deteriorate.

  According to U.S. Patent No. 4,075,005, good results have been obtained

  These are capable of being obtained when the bipyridilium salt compositions are supplemented with alkylcarboxylic acids, such as valerianic or butyric acids, in amounts of between 0.5 and 5%. At pH values close to neutrality, however, the foul odor has

tendency to disappear.

  According to British Patent No. 1,406,881 it is possible to employ a basic pyridine, i.e. a mixture of alkylpyridine; the latter, however, has a disadvantage which lies in its cost, since pyridine

  basic varies according to its origin and that it is necessary to

  closely match its composition to meet the requirements. It has been found, and this forms the object of the present invention that,

  liquid herbicide compositions based on bipyridilium salt, it is possible to add

  ter tert-butyl mercaptan or phenyl mercaptan, in amounts between 0.025% and 0.1% of the composition, at pH values between 3 and 8, and preferably of the order of 0.075% of one of said mercaptans or their mixture.

  In such conditions, the odor must still be sufficiently perceptible

  even after two years of storage.

  The advantages of these additives are the following: - low cost of the agent likely to confer the foul odor; - minimum amounts of agent required to achieve the desired effect (up to less than the amounts of alkylcarboxylic acids); a long persistence of the foul odor of the composition during its storage; - the agent gives a nauseating odor that would discourage anyone

consume the solution.

  The agent which confers the bad odor is found to be compatible with the generally used additives such surfactants, diluents used in the formulation of bipyridilium herbicides The compositions based on bipyridilium salt generally contain from 500 to 500. g / l herbicide. Under these conditions, the compositions may be added to the indicated amounts of agents imparting a foul odor.

  without giving rise to the aforementioned drawbacks.

  The persistence of this nauseating odor is the same whether the product is

  maintained at an acidic pH or an alkaline pH of between 3 and 8. However, it is

  the pH value is maintained at around 8.5 because

  in a medium or alkaline environment the bipyridilium salts are stable.

  Other advantages and features of the present invention are

  reading the following description and examples given

illustrative but not limiting.

EXAMPLE 1

  We introduce into a homogenizer:

  * 1,1-dimethyl-4,4'-bipyridilium chloride ............

* water ............

With stirring, then:

  * Nonylphenol-polyoxyethylate ............

  * Quaternary derivative of cocoamine ............

  * anti-foaming agent based on silicon ............

* tert-butylmercaptan ............

  The mixture is then brought to a volume of 1000 ml by adding 250 g o700g. 0.5 g 0.5 g. of water.

  After complete dissolution, the compositions are poured into a

  dille close and kept at this temperature for two years. At the opening of the bottle, after this period of storage, the solution obtained is

  clear and no longer has the nauseating odor characteristics

sells tert-butyl mercaptan.

EXAMPLE 2

  In the homogenizer, we introduce:

  * 1,1-dimethyl-4,4'-bipyridilium chloride ............

* At water

* water ............

Then, with stirring, add:

  * Nonylphenol-polyoxyethylate ............

  * Quaternary derivative of cocamine ............

  With anti-foaming agent based on silicon ............

* phenylmercaptan ............

  The mixture is then brought to 1000 ml by addition of water, then

  until a complete homogenization is achieved.

  400g 500g. 32g 48g 0,5g lg. it is agitated The composition is subdivided into two parts: - a part (formed of 500g) is put in a bottle as it is,

  another part is diluted in 300 cm3 of water.

  Both flasks are then kept for two years. When opened, we find that the solutions have kept their limpid state and their nauseating odor. Of course, the present invention is not limited to the examples

  and modes of implementation mentioned above; it is likely to

  Many variants accessible to those skilled in the art, depending on the applications

  contemplated and without departing from the spirit of the invention.

Claims (6)

  1. Solutions or compositions of herbicides based on bipyridilium salts,   characterized in that they contain as agent conferring a characteristic   from 0.025 to 0.1%, based on the weight of the solution or   tert-butyl mercaptan and / or phenyl mercaptan.   2. Solutions or herbicide compositions according to claim 1, characterized   in that they contain from 200 to 500 g / l of bipyridilium salts.   3. Solutions or compositions according to claim 1 or 2, characterized in that the herbicide is the 1,1'-dimethyl-4,4'-bipyridilium ion employed in   a quantity of the order of 200 to 600 g / l.   * 4.- Solutions or compositions of herbicides based on bipyridilium salts   according to claim 1, characterized in that the agent conferring a characteristic   foul-smelling product is tert-butylmercaptan used at a rate 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 characteristic   foul-smelling product is phenylmercaptan used at 0.025 to 0.1%   by weight of the solution or composition.   6. Solutions or herbicide compositions according to claim 1, characterized in that they contain 0.075% of tert-butyl mercaptan and / or   phenyl mercaptan by weight of the solution or composition.